This paper presents the design of wideband frequency reconfigurable metamaterial antenna with double H slots. The design is based on the idea of composite right/left-handed transmission line (CRLH-TL) technique. Bandwidth enhancement was achieved by utilizing series left-handed capacitor CL transmission line parameter. The design has several outstanding advantages which include efficient bandwidth to cover many lower Application bands with multi frequency operation characteristics. A comprehensive analysis and simulation were done by using computer simulation technology (CST) software to determine the performance and efficiency of the proposed antenna. From the result obtained, the antenna aquired bandwidth range which covered (2.3-5.2) GHz which is equivalent to 77% fractional bandwidth. The wideband antenna was reconfigured by using frequency reconfiguration technique. From the reconfiguration results, the antenna can be switch from wideband to two single bands which resonate at 2.4 GHz and 4.2 GHz and to dual band which resonate at 2.4 GHz and 4.2 GHz. The realized peak gain at 2.4 GHz is 2.28 dBi and 2.58 dBi for E and H field respectively. The maximum efficiency of 96% was obtained. The antenna can be use for WLAN, proposed lower 5G band and cognitive radio system for frequency sencing.
Circularly polarized antenna array based on hybrid couplers for 5G devicesjournalBEEI
This paper depicts a wideband circularly polarized (CP) antenna for 5G devices. The antenna array has a 3D structure including four simple printed dipole elements with directional radiations, high gain, and high efficiency. It achieves a CP by using the sequential rotation (SR) feeding based on 90°-3dB hybrid couplers in the proposed feeding network. The antenna array bandwidth is wide, 26.7%, with an operating frequency band from 3.35 GHz to 4.35 GHz. The antenna achieves a high peak gain of 10.73 dBi and high efficiency of 93.75%. Besides, the antenna gain is stable over the operating bandwidth (BW). At the centre operating frequency of 3.75 GHz, the angle of circular polarization is 51°. The antenna is designed and fabricated on the Rogers 4003 C substrate. The measured S11 is well matching with the simulation results. With the above characteristics, the proposed antenna can be a suitable candidate for 5G devices.
Outage performance users located outside D2D coverage area in downlink cellul...journalBEEI
Device-to-device (D2D) communication has been proposed to employ the proximity between two devices to enhance the overall spectrum utilization of a crowded cellular network. With the help of geometric probability tools, this framework considers the performance of cellular users under spatial separation with the D2D pair is investigated. The measurement results and analytical expression of outage probability show that the proposed frameworks improve the outage performance at a high signal-tonoise ratio (SNR) at the base station. Results also interpret that the distances between nodes in the D2D-assisted network make slight impacts on the performance of the cellular user.
Design and analysis of microstrip antenna with zig-zag feeder for wireless co...journalBEEI
This paper is presented a microstrip antenna with a zig-zag feeder for wireless communication, it has a wideband frequency spectrum (2-14) GHz. The proposed antenna is designed with a zig zag feed line which gave a wideband frequency and acceptable gain (7.448-5.928) dB, this antenna has zig zag slots printed in the ground plane on a lower side of the dielectric substrate, a certain form tuning stub is used to increase the matching between the feeder in the top layer of the substrate and ground plane in the bottom, this stub has an elliptical slot to performance matching input impedance with the feed line. The feeding technique used to feed this antenna is a strip feed line of 50 Ω. Different types of techniques are used to enhance the bandwidth of this antenna to get a wideband suitable for the requirements of the UWB antenna such as adjust the feed point position of the feed line with a tuning stub. All the radiation properties of the presented antenna are tested such as bandwidth, radiation pattern, and, gain.
Design and Analysis of Broadband Elliptical Microstrip Patch Antenna for Wire...TELKOMNIKA JOURNAL
In this paper presents the design and manufacture of a new broadband elliptical patch antenna
with a microstrip feed line and optimum antenna parameters. The antenna dimension of
(30 × 21 × 1.6) 푚푚3 and fabricated on an FR-4 epoxy substrate having relative dielectric constant 휀푟=4.3,
loss tangent tan (δ)=0.002 and the feed line used has characteristic impedance of 50Ω.The designed
antenna has the capability of operating in the bandwidth (6.95-30.94) GHz and the gain (6.8) dBi. The
antenna performance was modified by inserting a slots in the ground plane to achieve impedance
bandwidth (when S11≤-10dB) and slots to patch to improve the gain. The modified antenna was designed
to be used for fifth generation (5G) mobile communication. The simulation results are obtained using CST
software.
Designing large-scale antenna array using sub-arrayjournalBEEI
Antenna array of large scale have been examined for different applications including 5G technology. To get better data rate or a reliable link substantial number of antenna arrays have been utilized to provide high multiplexing gains as well as array gains with high directivity. In this paper a simple but efficient implementation technique of using sub-arrays for the improvement of large-sized uniform arrays. By repeating a small sub-array multiple times large arrays can be designed. This implication of utilizing small array simplifies the design of a larger array which allows the designer to concentrate on the smaller sub-array before assembling larger arrays. So, by investigating the sub arrays the performance and radiation characteristics of large arrays can be anticipated. The array-factor for a planar sub-array of 2x2 (4 elements) is analyzed using Mat-lab software and then a large array is formed by placing the 2x2 sub-array indifferent configurations in a rectangular arrangements up to 8x8 planar array. And then the results are validated with CST (Computer simulation technology) simulation results.In this way the array-factors, directivities, HPBWs, and side lobes of the constructed large arrays are analyzed and associated with the small sub-array.
Circularly polarized antenna array based on hybrid couplers for 5G devicesjournalBEEI
This paper depicts a wideband circularly polarized (CP) antenna for 5G devices. The antenna array has a 3D structure including four simple printed dipole elements with directional radiations, high gain, and high efficiency. It achieves a CP by using the sequential rotation (SR) feeding based on 90°-3dB hybrid couplers in the proposed feeding network. The antenna array bandwidth is wide, 26.7%, with an operating frequency band from 3.35 GHz to 4.35 GHz. The antenna achieves a high peak gain of 10.73 dBi and high efficiency of 93.75%. Besides, the antenna gain is stable over the operating bandwidth (BW). At the centre operating frequency of 3.75 GHz, the angle of circular polarization is 51°. The antenna is designed and fabricated on the Rogers 4003 C substrate. The measured S11 is well matching with the simulation results. With the above characteristics, the proposed antenna can be a suitable candidate for 5G devices.
Outage performance users located outside D2D coverage area in downlink cellul...journalBEEI
Device-to-device (D2D) communication has been proposed to employ the proximity between two devices to enhance the overall spectrum utilization of a crowded cellular network. With the help of geometric probability tools, this framework considers the performance of cellular users under spatial separation with the D2D pair is investigated. The measurement results and analytical expression of outage probability show that the proposed frameworks improve the outage performance at a high signal-tonoise ratio (SNR) at the base station. Results also interpret that the distances between nodes in the D2D-assisted network make slight impacts on the performance of the cellular user.
Design and analysis of microstrip antenna with zig-zag feeder for wireless co...journalBEEI
This paper is presented a microstrip antenna with a zig-zag feeder for wireless communication, it has a wideband frequency spectrum (2-14) GHz. The proposed antenna is designed with a zig zag feed line which gave a wideband frequency and acceptable gain (7.448-5.928) dB, this antenna has zig zag slots printed in the ground plane on a lower side of the dielectric substrate, a certain form tuning stub is used to increase the matching between the feeder in the top layer of the substrate and ground plane in the bottom, this stub has an elliptical slot to performance matching input impedance with the feed line. The feeding technique used to feed this antenna is a strip feed line of 50 Ω. Different types of techniques are used to enhance the bandwidth of this antenna to get a wideband suitable for the requirements of the UWB antenna such as adjust the feed point position of the feed line with a tuning stub. All the radiation properties of the presented antenna are tested such as bandwidth, radiation pattern, and, gain.
Design and Analysis of Broadband Elliptical Microstrip Patch Antenna for Wire...TELKOMNIKA JOURNAL
In this paper presents the design and manufacture of a new broadband elliptical patch antenna
with a microstrip feed line and optimum antenna parameters. The antenna dimension of
(30 × 21 × 1.6) 푚푚3 and fabricated on an FR-4 epoxy substrate having relative dielectric constant 휀푟=4.3,
loss tangent tan (δ)=0.002 and the feed line used has characteristic impedance of 50Ω.The designed
antenna has the capability of operating in the bandwidth (6.95-30.94) GHz and the gain (6.8) dBi. The
antenna performance was modified by inserting a slots in the ground plane to achieve impedance
bandwidth (when S11≤-10dB) and slots to patch to improve the gain. The modified antenna was designed
to be used for fifth generation (5G) mobile communication. The simulation results are obtained using CST
software.
Designing large-scale antenna array using sub-arrayjournalBEEI
Antenna array of large scale have been examined for different applications including 5G technology. To get better data rate or a reliable link substantial number of antenna arrays have been utilized to provide high multiplexing gains as well as array gains with high directivity. In this paper a simple but efficient implementation technique of using sub-arrays for the improvement of large-sized uniform arrays. By repeating a small sub-array multiple times large arrays can be designed. This implication of utilizing small array simplifies the design of a larger array which allows the designer to concentrate on the smaller sub-array before assembling larger arrays. So, by investigating the sub arrays the performance and radiation characteristics of large arrays can be anticipated. The array-factor for a planar sub-array of 2x2 (4 elements) is analyzed using Mat-lab software and then a large array is formed by placing the 2x2 sub-array indifferent configurations in a rectangular arrangements up to 8x8 planar array. And then the results are validated with CST (Computer simulation technology) simulation results.In this way the array-factors, directivities, HPBWs, and side lobes of the constructed large arrays are analyzed and associated with the small sub-array.
Performance analysis of beam divergence propagation through rainwater and sno...journalBEEI
In the present work the future communication requirements need to fulfill with high data rate, FSO (free space optic) with it is tremendous potential is the solution. This research observed the effectiveness analysis of FSO systems by modifying one of the most important FSO parameters beam divergence, under the most affected weather attenuating condition Rainwater and snow pack. The simulation is obtained and analyzed under single channels CSRZ-FSO (carrier-suppressed return-to-zero/free space optical) systems having capacity of 40 Gbps between two transceivers with variable distance. The connection is presently under 5 meteorological turbulences (light rain, medium rain, wet snow, heavy rain and dry snow). The results show the heavy rain and dry snow have a very high attenuation carried out in terms of Q-factor. this result led us to conclude that small divergence offers significant performance improvement for FSO link and this performance decrease every time the beam divergence increase, Therefore, to build inexpensive and reliable transmission media, we go with new method that still in the experiment area called hybrid RF/FSO (radio frequency/free space optical) that compatible with atmospherically status.
Antenna array design with rectangular ring slot for 5G technologyTELKOMNIKA JOURNAL
A patch antenna with rectangular-shaped ring slot that fed by a coaxial probe is proposed in this
article as the single element for planar patch array antenna design to meet the requirement of multiple
input multiple output (MIMO) in fifth generation (5G) technology. Initially, the single antenna element is
designed at three different center frequencies of 0.85, 1.9 and 2.6 GHz to cover the mobile operating
frequency of 0.8, 0.85, 0.9, 1.8, 2.1 and 2.6 GHz, which considering the proposed 5G spectrum below than
6 GHz. The rectangular-shaped ring slot is introduced to the patch antenna with the partial ground plane to
widen the bandwidth performance. The designed single element is then arranged to design planar arrays
of 2x2. Each of elements in the planar array is fed by a coaxial probe. The designs are utilizing a
high-performance substrate, Rogers 6010LM.
Dual-band aperture coupled antenna with harmonic suppression capabilityTELKOMNIKA JOURNAL
The paper presents an aperture-coupled dual-band linearly-polarized antenna with harmonic suppression capability, operating at frequency 2.45 GHz and 5.00 GHz. In purpose of improving the directivity of antenna at the operating frequency of 2.45 GHz and 5.00 GHz, a modified inverted π-shaped slot-etched patch on the lower layer of the stacked antenna is introduced alongside the 50 Ω feed line. The harmonic suppression capability is achieved by the introduction of U-slot and asymmetrical left-right-handed stub at the transmission feed line, suppressing unwanted harmonic signals from 6.00 GHz up to 10.00 GHz. The final design of the antenna has produced very good reflection coefficient of -18.87 dB at 2.45 GHz and -19.57 dB at 5.00 GHz with third and higher order harmonic suppression up to -4 dB.
A new look on CSI imperfection in downlink NOMA systemsjournalBEEI
Observing that cooperative scheme benefits to non-orthogonal multiple access (NOMA) systems, we focus on system performance analysis of downlink. However, spectrum efficiency is still high priority to be addressed in existing systems and hence this paper presents full-duplex enabling in NOMA systems. Other challenge needs be considered related to channel state information (CSI). In particular, we derive closedform expressions of outage probability for such NOMA systems under the presence of CSI imperfection. Furthermore, to fully exploit practical environment, we provide system model associated with Nakagami-m fading. The Monte-Carlo simulations are conducted to verify the exactness of considered systems.
A Hepta-Band Antenna For Wireless Applicationsdbpublications
Microstrip antennas are also known as printed antennas and they have a variety of applications in radar systems, microwave communication links, satellite communication systems, wireless and mobile communication systems, medical equipment, etc. In this paper, a model of inverted T-shaped slot rectangular patch antenna is designed and simulated to evaluate the performance. The proposed antenna is designed to cover the common wireless applications. The output results are taken and analyzed for their radiation pattern and transmission losses. The reference/characteristic impedance taken is 50 Ω and the operating frequency domain is 1.7GHz to 7.68 GHz. The microstrip patch antenna is encapsulated in the FR-4 low cost substrate whose dielectric constant is 4.4.
A Miniature BroadBand Microstrip Antenna for LTE, Wi-Fi and WiMAX Applications IJECEIAES
A Compact microstrip antenna with rectangular slotted radiating element has been developed. Four slots have been introduced on the radiating element with the use of a partial ground plane and a wideband response has been obtained. The bandwidth of the proposed antenna is 1.7 GHz with a percentage bandwidth of 71%. A low-cost dielectric (FR4_EPOXY) has been considered in the development of the proposed antenna. The obtained frequency band is from 1.9 GHz to 3.6 GHz. To investigate the robustness of our modelled antenna the simulation process has been carried out using two different solvers (Finite Element Method and Finite Integration Technique). In addition, the designed antenna was realized and these results were compared with those of the simulation. The proposed antenna is suitable for many LTE bands {1, 3, 7… 38, 40} broadly deployed in European, South American, Asian, and African countries, Wi-Fi (2.4 GHz), and WiMAX technology (3.5 GHz).
Design and Analysis of Microstrip Antenna for CDMA Systems CommunicationIOSR Journals
This paper proposes a newly designed microstrip patch antennas (MSA) for wireless application
(CDMA Systems). The designed single antenna E-shaped patch antenna. Two parallel slots are in corporated
into the patch of a microstrip antenna to expand it bandwidth, and designed antenna operates in the frequency
range of 1.85 to 1.99 GHz. The antenna is designed using air as a dielectric substrate between the ground plane
and substrate patch antenna. IE3D is a full-wave electromagnetic simulator based on the method of moments
(MoM) technique. It has been widely used in the design of MICs, RFICs, patch antennas, wire antennas, and
other RF/wireless antennas. It can be used to calculate and plot the S parameters, VSWR, current distributions
as well as the radiation patterns. The results obtained for each patch were 2D and 3D view of patch, Directivity,
Gain, beam width and other such parameters, true and mapped 3D radiation pattern, and 2D polar radiation
pattern. The antenna successfully achieves the exhibit a broad impedance bandwidth of 27 % (at VSWR < 2)
with respect to the center frequency of 1.9 GHz is designed, fabricated, and finally measured on Spectrum
analyzer. The radiation pattern and directivity are also presented.. Gain maximum achievable is 3 dBi and good
return loss (S11 parameters) of -30 dB is achieved along with broadside radiation pattern.
Gain enhancement of microstrip patch antenna using artificial magnetic conductorjournalBEEI
The paper presents an artificial magnetic conductor (AMC) structure to enhance the gain of the double microstrip patch antenna. By placing this kind of metamaterial in between the two Rogers RT5880 substrates, the antenna achieved lots of improvement especially in terms of size miniaturization, bandwidth, return loss, gain and efficiency. The antenna is intended to operate at 16 GHz where the prospect fifth generation (5G) spectrum might be located. Integration of AMC structure into the proposed antenna helps to improve nearly 16.3% of gain and almost 23.6% of size reduction.
Design of wide band slotted microstrip patch antenna with defective ground st...IJECEIAES
This paper proposes a microstrip patch antenna (MSPA) in the Ku band for satellite applications. The antenna is small in size with dimensions of about 40 mm×48 mm×1.59 mm and is fed with a coaxial cable of 50 Ω impedance. The proposed antenna has a wide bandwidth of 3.03 GHz ranging from 12.8 GHz to 15.8 GHz. To realize the characteristics of wideband the techniques of defective ground structure (DGS) and etching slots on the radiating element are adopted. The antenna is modeled on the FR4 substrate. A basic circular patch is selected for the design of a dual-frequency operation and in the next step DGS is introduced into the basic antenna and enhanced bandwidth is achieved at both the frequencies. To attain wider bandwidth two slots are etched on the radiating element of which one is a square ring slot and the second one is a circular ring slot. The novelty of the proposed antenna is a miniaturized design and unique response within the Ku band region which is applicable for wireless UWB applications with VSWR <2 and an average gain of 3.6 dB.
Gain enhancement of dielectric resonator antenna for millimeter wave applicat...TELKOMNIKA JOURNAL
In this paper, dielectric resonator antenna (DRA) with enhanced gain operating on the higher
order mode (푇퐸훿15
푥 ) is presented. The dielectric resonator antenna with dielectric constant 휀푟 of 10 and
loss tangent of 0.002 is used. The DRA is fed by microstrip line through an aperture slot. The proposed
antenna is designed at 26 GHz and achieved a gain of 7.9 dBi with corresponding simulated radiation
efficiency of 93%. The impedance bandwidth of 1.5 GHz from 25.1 GHz to 26.6 GHz has been achieved.
The reflection coefficient, antenna gain, radiation patterns, and efficiency of the antenna are studied.
Simulations are performed using CST microwave studio, and their results are presented.
A compact triband microstrip antenna utilizing hexagonal CSRR for wireless co...journalBEEI
In this paper, a compact triband printed antenna with hexagonal complementary split-ring resonators (CSRRs) for 4G applications is proposed. The proposed multiband antenna is comprised of a rectangular patch antenna on the top plane, while on the ground plane, hexagonal CSRRs are etched for size miniaturization (at the lower bands) and multiband generation. Another effect of the CSRR is the shifting of the initial resonance of the patch antenna from 5.17 GHz to the higher band of 6.18 GHz. The triband of 180 MHz 2.4~2.59, 150 MHz 2.79~2.94 and 420 MHz 6.04~6.46 GHz bands acquired can cover WLAN/Wi-Fi and WiMAX operating bands adequately. This can be achieved by choosing the optimal size and position of the CSRR on the ground plane carefully. The design occupies a total size of 45 x 45 mm2 using the low-cost FR-4 substrate. Good agreements are obtained between the measured results and the simulated, which are discussed and presented.
Multiband antenna using stacked series array for Ka-Band applicationjournalBEEI
In this paper, a multiband stack series array antenna is designed in order to attain solutions for the future 28 GHz Ka-band application. Double layer substrate Technology is utilized to accomplish multiple resonant frequencies with higher data transfer capacities due to high bandwidth. The designed antenna is dependent on twofold layer consisting patches and resonators in different layers stacked together. The designed multiband antennas can resonate at single band of
(28 GHz), dual band of (28 and 30 GHz) and triple band of (24.18, 26 and 28.453). The results achieved in the simulation are later fabricated and tested. The test result illustrates that the antennas have wide bandwidth, high gain and even higher efficiencies. All the proposed antenna configurations have demonstrated a decent possibility for 5G millimeter wave (mmwave) application.
An ultra wideband antenna for Ku band applicationsIJECEIAES
This paper presents a candidate ultra wideband antenna for Ku-band wireless communi- cations applications, analyzed and optimized by the finite element method (FEM). This three-dimensional modeling was realized and compared with published antennas for val- idate the performances of the proposed antenna. Its design is based on the insertion o fseveral symmetrical slots of different sizes on the ground plane of a mono-layer patch antenna to overcome the main limitation of the narrow bandwidth of patch antennas. The proposed antenna, made on an FR-4 epoxy mono-layer substrate with a defected ground plane (dielectric constant εr = 4,4, loss tangent tan δ = 0,02 and thickness hs = 1.6 mm). The simulated numerical results obtained are very satisfying; Bandwidth = 10.48 GHz from f1 = 9.34 GHz to f2 = 19.82 GHz, S11 = -34.17 dB, Voltage Stationary Wave Ratio VSWR = 1.04 , Gain = 6.27 dB.
Design & Simulation of 8-Shape Slotted Microstrip Patch Antenna
This paper presents an 8-shape slotted microstrip patch antenna. The antenna is fed by microstrip
transmission line. The proposed antenna is simulated with the help of commercially available GEMS software
based on the parallel FDTD algorithm. The antenna is designed by FR4 substrate and ground plane with an area
50mm×40mm×1.60 mm. The designed antenna generates three resonant modes at 2.12 GHz, 6.98 GHz and 13.84
GHz respectively. The bandwidths of the antenna (-10 dB) of the three frequencies are 25.75%, 6.13% and
20.63% respectively. The return loss (S ) characteristics for the three bands are -41.95 dB, -22.68 dB and -23.15
11
dB respectively. The 3D radiation patterns of the proposed antenna are provided in the paper.
A novel multi-resonant and wideband fractal antenna for telecommunication ap...IJECEIAES
This letter presents the design, simulation, and measurement of a novel multiband fractal circular antenna for wireless applications. In the antenna design, we used a circular antenna where we took a ring. Then, in the first iteration, we added a new ring divided into two of the same size. For the second iteration, we added a ring of the same size after dividing it into two halves. In the third iteration, we added the third ring of the same size after dividing it into four. Due to the resonator defection, we were able to reduce the size of the starting antenna from 60×70×2 mm3 to 50×50×1.6 mm3 , to get the frequency of 2.48 GHz, and we generated new bandwidths with a high gain that reaches 5.02 dB. The proposed antenna radiation characteristics, such as the impedance matching, the gain, the radiation pattern, and the surface current distribution are presented and discussed. We find that the simulated and measured results are in acceptable agreement and affirm the good performance of the proposed antenna. The results obtained affirm that the proposed fractal antenna is a better candidate for integration into wireless communication circuits.
Performance analysis of beam divergence propagation through rainwater and sno...journalBEEI
In the present work the future communication requirements need to fulfill with high data rate, FSO (free space optic) with it is tremendous potential is the solution. This research observed the effectiveness analysis of FSO systems by modifying one of the most important FSO parameters beam divergence, under the most affected weather attenuating condition Rainwater and snow pack. The simulation is obtained and analyzed under single channels CSRZ-FSO (carrier-suppressed return-to-zero/free space optical) systems having capacity of 40 Gbps between two transceivers with variable distance. The connection is presently under 5 meteorological turbulences (light rain, medium rain, wet snow, heavy rain and dry snow). The results show the heavy rain and dry snow have a very high attenuation carried out in terms of Q-factor. this result led us to conclude that small divergence offers significant performance improvement for FSO link and this performance decrease every time the beam divergence increase, Therefore, to build inexpensive and reliable transmission media, we go with new method that still in the experiment area called hybrid RF/FSO (radio frequency/free space optical) that compatible with atmospherically status.
Antenna array design with rectangular ring slot for 5G technologyTELKOMNIKA JOURNAL
A patch antenna with rectangular-shaped ring slot that fed by a coaxial probe is proposed in this
article as the single element for planar patch array antenna design to meet the requirement of multiple
input multiple output (MIMO) in fifth generation (5G) technology. Initially, the single antenna element is
designed at three different center frequencies of 0.85, 1.9 and 2.6 GHz to cover the mobile operating
frequency of 0.8, 0.85, 0.9, 1.8, 2.1 and 2.6 GHz, which considering the proposed 5G spectrum below than
6 GHz. The rectangular-shaped ring slot is introduced to the patch antenna with the partial ground plane to
widen the bandwidth performance. The designed single element is then arranged to design planar arrays
of 2x2. Each of elements in the planar array is fed by a coaxial probe. The designs are utilizing a
high-performance substrate, Rogers 6010LM.
Dual-band aperture coupled antenna with harmonic suppression capabilityTELKOMNIKA JOURNAL
The paper presents an aperture-coupled dual-band linearly-polarized antenna with harmonic suppression capability, operating at frequency 2.45 GHz and 5.00 GHz. In purpose of improving the directivity of antenna at the operating frequency of 2.45 GHz and 5.00 GHz, a modified inverted π-shaped slot-etched patch on the lower layer of the stacked antenna is introduced alongside the 50 Ω feed line. The harmonic suppression capability is achieved by the introduction of U-slot and asymmetrical left-right-handed stub at the transmission feed line, suppressing unwanted harmonic signals from 6.00 GHz up to 10.00 GHz. The final design of the antenna has produced very good reflection coefficient of -18.87 dB at 2.45 GHz and -19.57 dB at 5.00 GHz with third and higher order harmonic suppression up to -4 dB.
A new look on CSI imperfection in downlink NOMA systemsjournalBEEI
Observing that cooperative scheme benefits to non-orthogonal multiple access (NOMA) systems, we focus on system performance analysis of downlink. However, spectrum efficiency is still high priority to be addressed in existing systems and hence this paper presents full-duplex enabling in NOMA systems. Other challenge needs be considered related to channel state information (CSI). In particular, we derive closedform expressions of outage probability for such NOMA systems under the presence of CSI imperfection. Furthermore, to fully exploit practical environment, we provide system model associated with Nakagami-m fading. The Monte-Carlo simulations are conducted to verify the exactness of considered systems.
A Hepta-Band Antenna For Wireless Applicationsdbpublications
Microstrip antennas are also known as printed antennas and they have a variety of applications in radar systems, microwave communication links, satellite communication systems, wireless and mobile communication systems, medical equipment, etc. In this paper, a model of inverted T-shaped slot rectangular patch antenna is designed and simulated to evaluate the performance. The proposed antenna is designed to cover the common wireless applications. The output results are taken and analyzed for their radiation pattern and transmission losses. The reference/characteristic impedance taken is 50 Ω and the operating frequency domain is 1.7GHz to 7.68 GHz. The microstrip patch antenna is encapsulated in the FR-4 low cost substrate whose dielectric constant is 4.4.
A Miniature BroadBand Microstrip Antenna for LTE, Wi-Fi and WiMAX Applications IJECEIAES
A Compact microstrip antenna with rectangular slotted radiating element has been developed. Four slots have been introduced on the radiating element with the use of a partial ground plane and a wideband response has been obtained. The bandwidth of the proposed antenna is 1.7 GHz with a percentage bandwidth of 71%. A low-cost dielectric (FR4_EPOXY) has been considered in the development of the proposed antenna. The obtained frequency band is from 1.9 GHz to 3.6 GHz. To investigate the robustness of our modelled antenna the simulation process has been carried out using two different solvers (Finite Element Method and Finite Integration Technique). In addition, the designed antenna was realized and these results were compared with those of the simulation. The proposed antenna is suitable for many LTE bands {1, 3, 7… 38, 40} broadly deployed in European, South American, Asian, and African countries, Wi-Fi (2.4 GHz), and WiMAX technology (3.5 GHz).
Design and Analysis of Microstrip Antenna for CDMA Systems CommunicationIOSR Journals
This paper proposes a newly designed microstrip patch antennas (MSA) for wireless application
(CDMA Systems). The designed single antenna E-shaped patch antenna. Two parallel slots are in corporated
into the patch of a microstrip antenna to expand it bandwidth, and designed antenna operates in the frequency
range of 1.85 to 1.99 GHz. The antenna is designed using air as a dielectric substrate between the ground plane
and substrate patch antenna. IE3D is a full-wave electromagnetic simulator based on the method of moments
(MoM) technique. It has been widely used in the design of MICs, RFICs, patch antennas, wire antennas, and
other RF/wireless antennas. It can be used to calculate and plot the S parameters, VSWR, current distributions
as well as the radiation patterns. The results obtained for each patch were 2D and 3D view of patch, Directivity,
Gain, beam width and other such parameters, true and mapped 3D radiation pattern, and 2D polar radiation
pattern. The antenna successfully achieves the exhibit a broad impedance bandwidth of 27 % (at VSWR < 2)
with respect to the center frequency of 1.9 GHz is designed, fabricated, and finally measured on Spectrum
analyzer. The radiation pattern and directivity are also presented.. Gain maximum achievable is 3 dBi and good
return loss (S11 parameters) of -30 dB is achieved along with broadside radiation pattern.
Gain enhancement of microstrip patch antenna using artificial magnetic conductorjournalBEEI
The paper presents an artificial magnetic conductor (AMC) structure to enhance the gain of the double microstrip patch antenna. By placing this kind of metamaterial in between the two Rogers RT5880 substrates, the antenna achieved lots of improvement especially in terms of size miniaturization, bandwidth, return loss, gain and efficiency. The antenna is intended to operate at 16 GHz where the prospect fifth generation (5G) spectrum might be located. Integration of AMC structure into the proposed antenna helps to improve nearly 16.3% of gain and almost 23.6% of size reduction.
Design of wide band slotted microstrip patch antenna with defective ground st...IJECEIAES
This paper proposes a microstrip patch antenna (MSPA) in the Ku band for satellite applications. The antenna is small in size with dimensions of about 40 mm×48 mm×1.59 mm and is fed with a coaxial cable of 50 Ω impedance. The proposed antenna has a wide bandwidth of 3.03 GHz ranging from 12.8 GHz to 15.8 GHz. To realize the characteristics of wideband the techniques of defective ground structure (DGS) and etching slots on the radiating element are adopted. The antenna is modeled on the FR4 substrate. A basic circular patch is selected for the design of a dual-frequency operation and in the next step DGS is introduced into the basic antenna and enhanced bandwidth is achieved at both the frequencies. To attain wider bandwidth two slots are etched on the radiating element of which one is a square ring slot and the second one is a circular ring slot. The novelty of the proposed antenna is a miniaturized design and unique response within the Ku band region which is applicable for wireless UWB applications with VSWR <2 and an average gain of 3.6 dB.
Gain enhancement of dielectric resonator antenna for millimeter wave applicat...TELKOMNIKA JOURNAL
In this paper, dielectric resonator antenna (DRA) with enhanced gain operating on the higher
order mode (푇퐸훿15
푥 ) is presented. The dielectric resonator antenna with dielectric constant 휀푟 of 10 and
loss tangent of 0.002 is used. The DRA is fed by microstrip line through an aperture slot. The proposed
antenna is designed at 26 GHz and achieved a gain of 7.9 dBi with corresponding simulated radiation
efficiency of 93%. The impedance bandwidth of 1.5 GHz from 25.1 GHz to 26.6 GHz has been achieved.
The reflection coefficient, antenna gain, radiation patterns, and efficiency of the antenna are studied.
Simulations are performed using CST microwave studio, and their results are presented.
A compact triband microstrip antenna utilizing hexagonal CSRR for wireless co...journalBEEI
In this paper, a compact triband printed antenna with hexagonal complementary split-ring resonators (CSRRs) for 4G applications is proposed. The proposed multiband antenna is comprised of a rectangular patch antenna on the top plane, while on the ground plane, hexagonal CSRRs are etched for size miniaturization (at the lower bands) and multiband generation. Another effect of the CSRR is the shifting of the initial resonance of the patch antenna from 5.17 GHz to the higher band of 6.18 GHz. The triband of 180 MHz 2.4~2.59, 150 MHz 2.79~2.94 and 420 MHz 6.04~6.46 GHz bands acquired can cover WLAN/Wi-Fi and WiMAX operating bands adequately. This can be achieved by choosing the optimal size and position of the CSRR on the ground plane carefully. The design occupies a total size of 45 x 45 mm2 using the low-cost FR-4 substrate. Good agreements are obtained between the measured results and the simulated, which are discussed and presented.
Multiband antenna using stacked series array for Ka-Band applicationjournalBEEI
In this paper, a multiband stack series array antenna is designed in order to attain solutions for the future 28 GHz Ka-band application. Double layer substrate Technology is utilized to accomplish multiple resonant frequencies with higher data transfer capacities due to high bandwidth. The designed antenna is dependent on twofold layer consisting patches and resonators in different layers stacked together. The designed multiband antennas can resonate at single band of
(28 GHz), dual band of (28 and 30 GHz) and triple band of (24.18, 26 and 28.453). The results achieved in the simulation are later fabricated and tested. The test result illustrates that the antennas have wide bandwidth, high gain and even higher efficiencies. All the proposed antenna configurations have demonstrated a decent possibility for 5G millimeter wave (mmwave) application.
An ultra wideband antenna for Ku band applicationsIJECEIAES
This paper presents a candidate ultra wideband antenna for Ku-band wireless communi- cations applications, analyzed and optimized by the finite element method (FEM). This three-dimensional modeling was realized and compared with published antennas for val- idate the performances of the proposed antenna. Its design is based on the insertion o fseveral symmetrical slots of different sizes on the ground plane of a mono-layer patch antenna to overcome the main limitation of the narrow bandwidth of patch antennas. The proposed antenna, made on an FR-4 epoxy mono-layer substrate with a defected ground plane (dielectric constant εr = 4,4, loss tangent tan δ = 0,02 and thickness hs = 1.6 mm). The simulated numerical results obtained are very satisfying; Bandwidth = 10.48 GHz from f1 = 9.34 GHz to f2 = 19.82 GHz, S11 = -34.17 dB, Voltage Stationary Wave Ratio VSWR = 1.04 , Gain = 6.27 dB.
Design & Simulation of 8-Shape Slotted Microstrip Patch Antenna
This paper presents an 8-shape slotted microstrip patch antenna. The antenna is fed by microstrip
transmission line. The proposed antenna is simulated with the help of commercially available GEMS software
based on the parallel FDTD algorithm. The antenna is designed by FR4 substrate and ground plane with an area
50mm×40mm×1.60 mm. The designed antenna generates three resonant modes at 2.12 GHz, 6.98 GHz and 13.84
GHz respectively. The bandwidths of the antenna (-10 dB) of the three frequencies are 25.75%, 6.13% and
20.63% respectively. The return loss (S ) characteristics for the three bands are -41.95 dB, -22.68 dB and -23.15
11
dB respectively. The 3D radiation patterns of the proposed antenna are provided in the paper.
A novel multi-resonant and wideband fractal antenna for telecommunication ap...IJECEIAES
This letter presents the design, simulation, and measurement of a novel multiband fractal circular antenna for wireless applications. In the antenna design, we used a circular antenna where we took a ring. Then, in the first iteration, we added a new ring divided into two of the same size. For the second iteration, we added a ring of the same size after dividing it into two halves. In the third iteration, we added the third ring of the same size after dividing it into four. Due to the resonator defection, we were able to reduce the size of the starting antenna from 60×70×2 mm3 to 50×50×1.6 mm3 , to get the frequency of 2.48 GHz, and we generated new bandwidths with a high gain that reaches 5.02 dB. The proposed antenna radiation characteristics, such as the impedance matching, the gain, the radiation pattern, and the surface current distribution are presented and discussed. We find that the simulated and measured results are in acceptable agreement and affirm the good performance of the proposed antenna. The results obtained affirm that the proposed fractal antenna is a better candidate for integration into wireless communication circuits.
A Compact Dual Band Elliptical Microstrip Antenna for Ku/K Band Satellite App...IJECEIAES
This paper presents an original elliptical microstrip patch antenna is proposed for Ku/K band satellite applications. The proposed antenna has a simple structure, small size with dimensions of about 10×12×1.58 mm³. The antenna has been designed and simulated on an FR4 substrate with dielectric constant 4.4 and thickness of 1.58 mm. The design is simulated by two different electromagnetic solvers. The results from the measured data show that the antenna has two resonant frequencies that define 2 bandwidths, defined by a return loss of less than -10 dB, and are: (14.44 GHz, 829 MHz) and (21.05 GHz, 5126 MHz),with the gain 5.59 dB and 5.048 dB respectively. The proposed antenna can be used in many applications such as in satellite, and wireless communications.
A New Compact CPW-Fed Dual-Band Uniplanar Antenna for RFID ApplicationsTELKOMNIKA JOURNAL
In this paper a new dual-band uniplanar monopole antenna fed by Coplanar
Waveguide (CPW) line is proposed for Radio Frequency Identification (RFID) applications. The
antenna structure includes a CPW fed line and the dual-band operation is achieved from the Gshaped
folded antenna. The antenna parameters have been investigated and optimized by
using CST Microwave Studio. To validate the CST Microwave Studio results before the antenna
achievement, we have conducted another study by using ADS. The final circuit was achieved,
measured and validated. Experimental results show that the proposed antenna with compact
size of 30*45 mm2 is simple in design and compact in size. It exhibits broadband impedance
matching, consistent omnidirectional radiation patterns and appropriate gain characteristics
suitable for the microwave RFID applicartions.
08 13sept 8080 10000-1-ed a new (edit ari)IAESIJEECS
This paper presents a study of a new dual-band monopole antenna fed by a Coplanar Waveguide (CPW) line suitable for Radio Frequency Identification (RFID) applications especially designed for RFID readers and covering free ISM bands of 2.45GHz and 5.8GHz. The proposed antenna benefits from the advantages of the CPW line to simplify the structure of the antenna into a single metallic level, by consequent making it easier for integration with microwave integrated circuits. The simulation of the antenna was carried out using ADS from Agilent technologies and CST Microwave Studio electromagnetic solvers. A good impedance bandwidth of 500MHz is achieved in measurement (from 2.1GHz to 2.6GHz for the lower band), while the upper band covers 800MHz (from 5.2GHz to 6GHz). Details of the proposed antenna design and both simulated and experimental results are described and discussed.
A single element of multiband switched beam antenna for 5G applicationsIJECEIAES
This work proposes a simple design of switched beam antenna on square split-ring resonator to operate in multiband frequencies. The antenna is designed to support fifth generation (5G) wireless applications. The proposed antenna provides two different of the main beams, 45˚/225˚±5˚ and 135˚/315˚±5˚, by shorted circuit at 4 different edges. The designed antenna can support nine frequency bands, 7.071, 9.006, 9.321, 9.906, 10.428, 10.718, 12.967, 13.057 and 14.469 GHz, which are the high-band of 5G spectrum when shorted circuit to the ground conductor. The antenna provides maximum gain of 6.41 dBi. The dimension of the antenna is 6×6 mm2 which the thickness of 1.73 mm. The proposed design is based on a simple beam switching antenna configuration, compact size and low-cost manufacturing.
Design LTE Microstrip Antenna Rectangular Patch with Beetle-Shaped SlotTELKOMNIKA JOURNAL
In this paper, the microstrip antenna rectangular patch with beetle shaped slot is presented. The
characterization results of the proposed antenna obtained by changing the dimensions of the ground
plane. CST software is used to design and analyze this proposed antenna. The simulated results of
proposed antenna show that the antenna works at the frequency of 2.1 GHz while the return loss of -32.18
dB with the bandwidth reaches 155.19 MHz and the gain of 3.895 dBi.
A Novel Low Cost Fractal Antenna Structure for ISM and WiMAX ApplicationsTELKOMNIKA JOURNAL
Different fractal structures have been widely used in many antennas designs for various applications. A fractal antenna is used for miniaturization and multiband operation. This paper presents a design of a dual-band fractal antenna fed by coplanar waveguide (CPW) transmission line. The proposed antenna is designed and fabricated on an FR4 substrate with a volume of 70x60x1.6mm3, resonates at 2.42-2.62GHz and 3.40-3.65GHz with a return loss less than -10dB. The design and simulation process is carried out by using CST-MW studio electromagnetic solver. Simulation results show that the resulting antenna exhibits an interesting dual frequency resonant behavior making it suitable for dual band communication systems including the ISM and WiMAX applications. Concerning the fabrication and measurement of the final prototype of this antenna, a good agreement is found between simulation and measurement results for both frequency bands.
Design of Compact Monopole Antenna using Double U-DMS Resonators for WLAN, LT...TELKOMNIKA JOURNAL
In this research, a novel wide-band microstrip antenna for wideband applications is proposed.
The proposed antenna consists of a square radiating patch and a partial ground plane with a smal
rectangular notch-shape. Two symmetrical U-slots are etched in radiating patch. The defected microstrip
U-shapes and the small notch improve the antenna characterestics such impedance wideband and the
gain along the transmission area. The proposed antenna is simulated on an FR4 substrate of a dielectric
constant of 4.3, thickness 1.6 mm, permittivity 4.4, and loss tangent 0.018. The simulation and optimization
results are carried out using CST software.The antenna topology occupies an area of 30 × 40 × 0.8 mm3
or about 0.629λg × 0.839λg × 0.017λg at 3 GHz (the centerresonance frequency). The antenna covers the
range of 2.1711 to 4.0531 GHz, which meet the requirements of the wireless local area network (WLAN),
worldwide interoperability for microwave access (WiMAX) and LTE (Long Term Evolution) band
applications. Good VSWR, return loss and radiation pattern characteristics are obtained in the frequency
band of interest. The obtained Simulation results for this antenna depict that it exhibits good radiation
behavior within the transmission frequency range.
A small H-shaped microstrip patch antenna (MPA) with enhanced bandwidth is presented. The H-shaped antenna is first studied and then fully simulated by HFSS. A dual U slot H patch configuration is proposed to increase the narrow bandwidth, radiation efficiency and directivity. A novel H-shaped patch antenna suitable for wireless and satellite communications is presented. This paper presents the dual U slot H-shaped microstrip patch antenna feed by transmission line. The decrease in the prices of handheld devices and services has made available on the move internet and web services facility to the customers, small antennas requirement are increasing. In this paper H-shaped patch antenna is designed using FR4 substrate. The proposed modified H shaped antenna is designed and simulated using HFSS and caters to various wireless applications such as WiMAX, Wi-Fi, UMTS and Digital Multimedia Broadcasting (DMB) e.g. T V, etc.
In this paper a compact, flexible, Multiband antenna is designed. It is having flexible Substrate of photographic paper which makes the antenna conformal. The antenna with two U slots cut in radiating patch is offset fed by microstrip lines gives the multiple bands of WLAN/WIMAX Application and two parasitic Elements improves the bandwidth of a typical microstrip antenna. The Measured results shows that the antenna resonates between Frequency band 2.10-2.95 GHz, 3.35-3.54 GHz and 5.04-6.0Hz.which are used for application such as Bluetooth, Wi-Fi, Zigbee, ISM 2.4GHz,WLAN WiMAX, and WLAN 5.2GHz.
Comparative Analysis for Different Stack Shaped Microstrip Patch Antennaijsrd.com
A compact stack antenna consisting of square patch, loop couplers and inset feed line is reviewed in this work. This proposed design represents a stacked patch antenna having an arrangement of two substrates separated by an air gape and a coupling is provided using square loop structure. The structure is reviewed in two different directions firstly the feed arrangement is varied and secondly a variation in coupler structure is done to make the antenna work at multiple frequencies in UWB range. The simulation results of this work with different resonator structure and feed structures are presented and comparative analysis of these different arrangements is presented in this paper. Simulation results obtained from the proposed antenna for return loss, polar radiation and pattern voltage standing wave ratio (VSWR) shows its suitability for ultra wide band application.
Design and characterization of frequency reconfigurable honey bee antenna fo...IJECEIAES
In this article, a frequency reconfigurable honey-bee compact microstrip monopole antenna is proposed which is fed by a microstrip line (50 Ω) having the capability of providing dual-band as well as triple-band operation in eight distinct modes. By embedding three PIN diodes overs the honey bee arms, the effective current distribution is controlled hence resonant frequency is also changed in eight distinct modes in real-time. This is the reason the proposed antenna is portrayed as a frequency reconfigurable antenna in this paper which is suitable for cognitive radio application. This proposed antenna can be used for various wireless application such as Bluetooth, Wi-Fi, worldwide interoperability for microwave access (WiMAX), wireless local area network (WLAN), C-band, and X-band applications. The proposed antenna possesses a planner geometry of 39×34×0.87 mm3 which is printed on a substrate as flexible FR-4 (lossy) (εr=4.4 and tanδ=0.019). The proposed antenna exhibits voltage standing wave ratio (VSWR)<2 for all 19 resonant frequencies of interest and perceptible radiation pattern over entire frequency bands with a positive gain. CST microwave studio is used to find out all simulated results of antenna parameters.
Design and Analysis of Microstrip Antenna for CDMA Systems CommunicationIOSR Journals
Abstract: This paper proposes a newly designed microstrip patch antennas (MSA) for wireless application (CDMA Systems). The designed single antenna E-shaped patch antenna. Two parallel slots are in corporated into the patch of a microstrip antenna to expand it bandwidth, and designed antenna operates in the frequency range of 1.85 to 1.99 GHz. The antenna is designed using air as a dielectric substrate between the ground plane and substrate patch antenna. IE3D is a full-wave electromagnetic simulator based on the method of moments (MoM) technique. It has been widely used in the design of MICs, RFICs, patch antennas, wire antennas, and other RF/wireless antennas. It can be used to calculate and plot the S parameters, VSWR, current distributions as well as the radiation patterns. The results obtained for each patch were 2D and 3D view of patch, Directivity, Gain, beam width and other such parameters, true and mapped 3D radiation pattern, and 2D polar radiation pattern. The antenna successfully achieves the exhibit a broad impedance bandwidth of 27 % (at VSWR < 2) with respect to the center frequency of 1.9 GHz is designed, fabricated, and finally measured on Spectrum analyzer. The radiation pattern and directivity are also presented.. Gain maximum achievable is 3 dBi and good return loss (S11 parameters) of -30 dB is achieved along with broadside radiation pattern. Keywords - Microstrip Patch Antenna; E-shaped, CDMA systems communications; Coaxial Probe feed, IE3D
Square transposition: an approach to the transposition process in block cipherjournalBEEI
The transposition process is needed in cryptography to create a diffusion effect on data encryption standard (DES) and advanced encryption standard (AES) algorithms as standard information security algorithms by the National Institute of Standards and Technology. The problem with DES and AES algorithms is that their transposition index values form patterns and do not form random values. This condition will certainly make it easier for a cryptanalyst to look for a relationship between ciphertexts because some processes are predictable. This research designs a transposition algorithm called square transposition. Each process uses square 8 × 8 as a place to insert and retrieve 64-bits. The determination of the pairing of the input scheme and the retrieval scheme that have unequal flow is an important factor in producing a good transposition. The square transposition can generate random and non-pattern indices so that transposition can be done better than DES and AES.
Hyper-parameter optimization of convolutional neural network based on particl...journalBEEI
Deep neural networks have accomplished enormous progress in tackling many problems. More specifically, convolutional neural network (CNN) is a category of deep networks that have been a dominant technique in computer vision tasks. Despite that these deep neural networks are highly effective; the ideal structure is still an issue that needs a lot of investigation. Deep Convolutional Neural Network model is usually designed manually by trials and repeated tests which enormously constrain its application. Many hyper-parameters of the CNN can affect the model performance. These parameters are depth of the network, numbers of convolutional layers, and numbers of kernels with their sizes. Therefore, it may be a huge challenge to design an appropriate CNN model that uses optimized hyper-parameters and reduces the reliance on manual involvement and domain expertise. In this paper, a design architecture method for CNNs is proposed by utilization of particle swarm optimization (PSO) algorithm to learn the optimal CNN hyper-parameters values. In the experiment, we used Modified National Institute of Standards and Technology (MNIST) database of handwritten digit recognition. The experiments showed that our proposed approach can find an architecture that is competitive to the state-of-the-art models with a testing error of 0.87%.
Supervised machine learning based liver disease prediction approach with LASS...journalBEEI
In this contemporary era, the uses of machine learning techniques are increasing rapidly in the field of medical science for detecting various diseases such as liver disease (LD). Around the globe, a large number of people die because of this deadly disease. By diagnosing the disease in a primary stage, early treatment can be helpful to cure the patient. In this research paper, a method is proposed to diagnose the LD using supervised machine learning classification algorithms, namely logistic regression, decision tree, random forest, AdaBoost, KNN, linear discriminant analysis, gradient boosting and support vector machine (SVM). We also deployed a least absolute shrinkage and selection operator (LASSO) feature selection technique on our taken dataset to suggest the most highly correlated attributes of LD. The predictions with 10 fold cross-validation (CV) made by the algorithms are tested in terms of accuracy, sensitivity, precision and f1-score values to forecast the disease. It is observed that the decision tree algorithm has the best performance score where accuracy, precision, sensitivity and f1-score values are 94.295%, 92%, 99% and 96% respectively with the inclusion of LASSO. Furthermore, a comparison with recent studies is shown to prove the significance of the proposed system.
A secure and energy saving protocol for wireless sensor networksjournalBEEI
The research domain for wireless sensor networks (WSN) has been extensively conducted due to innovative technologies and research directions that have come up addressing the usability of WSN under various schemes. This domain permits dependable tracking of a diversity of environments for both military and civil applications. The key management mechanism is a primary protocol for keeping the privacy and confidentiality of the data transmitted among different sensor nodes in WSNs. Since node's size is small; they are intrinsically limited by inadequate resources such as battery life-time and memory capacity. The proposed secure and energy saving protocol (SESP) for wireless sensor networks) has a significant impact on the overall network life-time and energy dissipation. To encrypt sent messsages, the SESP uses the public-key cryptography’s concept. It depends on sensor nodes' identities (IDs) to prevent the messages repeated; making security goals- authentication, confidentiality, integrity, availability, and freshness to be achieved. Finally, simulation results show that the proposed approach produced better energy consumption and network life-time compared to LEACH protocol; sensors are dead after 900 rounds in the proposed SESP protocol. While, in the low-energy adaptive clustering hierarchy (LEACH) scheme, the sensors are dead after 750 rounds.
Plant leaf identification system using convolutional neural networkjournalBEEI
This paper proposes a leaf identification system using convolutional neural network (CNN). This proposed system can identify five types of local Malaysia leaf which were acacia, papaya, cherry, mango and rambutan. By using CNN from deep learning, the network is trained from the database that acquired from leaf images captured by mobile phone for image classification. ResNet-50 was the architecture has been used for neural networks image classification and training the network for leaf identification. The recognition of photographs leaves requested several numbers of steps, starting with image pre-processing, feature extraction, plant identification, matching and testing, and finally extracting the results achieved in MATLAB. Testing sets of the system consists of 3 types of images which were white background, and noise added and random background images. Finally, interfaces for the leaf identification system have developed as the end software product using MATLAB app designer. As a result, the accuracy achieved for each training sets on five leaf classes are recorded above 98%, thus recognition process was successfully implemented.
Customized moodle-based learning management system for socially disadvantaged...journalBEEI
This study aims to develop Moodle-based LMS with customized learning content and modified user interface to facilitate pedagogical processes during covid-19 pandemic and investigate how teachers of socially disadvantaged schools perceived usability and technology acceptance. Co-design process was conducted with two activities: 1) need assessment phase using an online survey and interview session with the teachers and 2) the development phase of the LMS. The system was evaluated by 30 teachers from socially disadvantaged schools for relevance to their distance learning activities. We employed computer software usability questionnaire (CSUQ) to measure perceived usability and the technology acceptance model (TAM) with insertion of 3 original variables (i.e., perceived usefulness, perceived ease of use, and intention to use) and 5 external variables (i.e., attitude toward the system, perceived interaction, self-efficacy, user interface design, and course design). The average CSUQ rating exceeded 5.0 of 7 point-scale, indicated that teachers agreed that the information quality, interaction quality, and user interface quality were clear and easy to understand. TAM results concluded that the LMS design was judged to be usable, interactive, and well-developed. Teachers reported an effective user interface that allows effective teaching operations and lead to the system adoption in immediate time.
Understanding the role of individual learner in adaptive and personalized e-l...journalBEEI
Dynamic learning environment has emerged as a powerful platform in a modern e-learning system. The learning situation that constantly changing has forced the learning platform to adapt and personalize its learning resources for students. Evidence suggested that adaptation and personalization of e-learning systems (APLS) can be achieved by utilizing learner modeling, domain modeling, and instructional modeling. In the literature of APLS, questions have been raised about the role of individual characteristics that are relevant for adaptation. With several options, a new problem has been raised where the attributes of students in APLS often overlap and are not related between studies. Therefore, this study proposed a list of learner model attributes in dynamic learning to support adaptation and personalization. The study was conducted by exploring concepts from the literature selected based on the best criteria. Then, we described the results of important concepts in student modeling and provided definitions and examples of data values that researchers have used. Besides, we also discussed the implementation of the selected learner model in providing adaptation in dynamic learning.
Prototype mobile contactless transaction system in traditional markets to sup...journalBEEI
One way to prevent and reduce the spread of the covid-19 pandemic is through physical distancing program. This research aims to develop a prototype contactless transaction system using digital payment mechanisms and QR code technology that will be applied in traditional markets. The method used in the development of electronic market systems is a prototype approach. The application of QR code and digital payments are used as a solution to minimize money exchange contacts that are common in traditional markets. The results showed that the system built was able to accelerate and facilitate the buying and selling transaction process in traditional market environment. Alpha testing shows that all functional systems are running well. Meanwhile, beta testing shows that the user can very well accept the system that was built. The results of the study also show acceptance of the usefulness of the system being built, as well as the optimism of its users to be able to take advantage of this system both technologically and functionally, so its can be a part of the digital transformation of the traditional market to the electronic market and has become one of the solutions in reducing the spread of the current covid-19 pandemic.
Wireless HART stack using multiprocessor technique with laxity algorithmjournalBEEI
The use of a real-time operating system is required for the demarcation of industrial wireless sensor network (IWSN) stacks (RTOS). In the industrial world, a vast number of sensors are utilised to gather various types of data. The data gathered by the sensors cannot be prioritised ahead of time. Because all of the information is equally essential. As a result, a protocol stack is employed to guarantee that data is acquired and processed fairly. In IWSN, the protocol stack is implemented using RTOS. The data collected from IWSN sensor nodes is processed using non-preemptive scheduling and the protocol stack, and then sent in parallel to the IWSN's central controller. The real-time operating system (RTOS) is a process that occurs between hardware and software. Packets must be sent at a certain time. It's possible that some packets may collide during transmission. We're going to undertake this project to get around this collision. As a prototype, this project is divided into two parts. The first uses RTOS and the LPC2148 as a master node, while the second serves as a standard data collection node to which sensors are attached. Any controller may be used in the second part, depending on the situation. Wireless HART allows two nodes to communicate with each other.
Implementation of double-layer loaded on octagon microstrip yagi antennajournalBEEI
A double-layer loaded on the octagon microstrip yagi antenna (OMYA) at 5.8 GHz industrial, scientific and medical (ISM) Band is investigated in this paper. The double-layer consist of two double positive (DPS) substrates. The OMYA is overlaid with a double-layer configuration were simulated, fabricated and measured. A good agreement was observed between the computed and measured results of the gain for this antenna. According to comparison results, it shows that 2.5 dB improvement of the OMYA gain can be obtained by applying the double-layer on the top of the OMYA. Meanwhile, the bandwidth of the measured OMYA with the double-layer is 14.6%. It indicates that the double-layer can be used to increase the OMYA performance in term of gain and bandwidth.
The calculation of the field of an antenna located near the human headjournalBEEI
In this work, a numerical calculation was carried out in one of the universal programs for automatic electro-dynamic design. The calculation is aimed at obtaining numerical values for specific absorbed power (SAR). It is the SAR value that can be used to determine the effect of the antenna of a wireless device on biological objects; the dipole parameters will be selected for GSM1800. Investigation of the influence of distance to a cell phone on radiation shows that absorbed in the head of a person the effect of electromagnetic radiation on the brain decreases by three times this is a very important result the SAR value has decreased by almost three times it is acceptable results.
Exact secure outage probability performance of uplinkdownlink multiple access...journalBEEI
In this paper, we study uplink-downlink non-orthogonal multiple access (NOMA) systems by considering the secure performance at the physical layer. In the considered system model, the base station acts a relay to allow two users at the left side communicate with two users at the right side. By considering imperfect channel state information (CSI), the secure performance need be studied since an eavesdropper wants to overhear signals processed at the downlink. To provide secure performance metric, we derive exact expressions of secrecy outage probability (SOP) and and evaluating the impacts of main parameters on SOP metric. The important finding is that we can achieve the higher secrecy performance at high signal to noise ratio (SNR). Moreover, the numerical results demonstrate that the SOP tends to a constant at high SNR. Finally, our results show that the power allocation factors, target rates are main factors affecting to the secrecy performance of considered uplink-downlink NOMA systems.
Design of a dual-band antenna for energy harvesting applicationjournalBEEI
This report presents an investigation on how to improve the current dual-band antenna to enhance the better result of the antenna parameters for energy harvesting application. Besides that, to develop a new design and validate the antenna frequencies that will operate at 2.4 GHz and 5.4 GHz. At 5.4 GHz, more data can be transmitted compare to 2.4 GHz. However, 2.4 GHz has long distance of radiation, so it can be used when far away from the antenna module compare to 5 GHz that has short distance in radiation. The development of this project includes the scope of designing and testing of antenna using computer simulation technology (CST) 2018 software and vector network analyzer (VNA) equipment. In the process of designing, fundamental parameters of antenna are being measured and validated, in purpose to identify the better antenna performance.
Transforming data-centric eXtensible markup language into relational database...journalBEEI
eXtensible markup language (XML) appeared internationally as the format for data representation over the web. Yet, most organizations are still utilising relational databases as their database solutions. As such, it is crucial to provide seamless integration via effective transformation between these database infrastructures. In this paper, we propose XML-REG to bridge these two technologies based on node-based and path-based approaches. The node-based approach is good to annotate each positional node uniquely, while the path-based approach provides summarised path information to join the nodes. On top of that, a new range labelling is also proposed to annotate nodes uniquely by ensuring the structural relationships are maintained between nodes. If a new node is to be added to the document, re-labelling is not required as the new label will be assigned to the node via the new proposed labelling scheme. Experimental evaluations indicated that the performance of XML-REG exceeded XMap, XRecursive, XAncestor and Mini-XML concerning storing time, query retrieval time and scalability. This research produces a core framework for XML to relational databases (RDB) mapping, which could be adopted in various industries.
Key performance requirement of future next wireless networks (6G)journalBEEI
Given the massive potentials of 5G communication networks and their foreseeable evolution, what should there be in 6G that is not in 5G or its long-term evolution? 6G communication networks are estimated to integrate the terrestrial, aerial, and maritime communications into a forceful network which would be faster, more reliable, and can support a massive number of devices with ultra-low latency requirements. This article presents a complete overview of potential 6G communication networks. The major contribution of this study is to present a broad overview of key performance indicators (KPIs) of 6G networks that cover the latest manufacturing progress in the environment of the principal areas of research application, and challenges.
Noise resistance territorial intensity-based optical flow using inverse confi...journalBEEI
This paper presents the use of the inverse confidential technique on bilateral function with the territorial intensity-based optical flow to prove the effectiveness in noise resistance environment. In general, the image’s motion vector is coded by the technique called optical flow where the sequences of the image are used to determine the motion vector. But, the accuracy rate of the motion vector is reduced when the source of image sequences is interfered by noises. This work proved that the inverse confidential technique on bilateral function can increase the percentage of accuracy in the motion vector determination by the territorial intensity-based optical flow under the noisy environment. We performed the testing with several kinds of non-Gaussian noises at several patterns of standard image sequences by analyzing the result of the motion vector in a form of the error vector magnitude (EVM) and compared it with several noise resistance techniques in territorial intensity-based optical flow method.
Modeling climate phenomenon with software grids analysis and display system i...journalBEEI
This study aims to model climate change based on rainfall, air temperature, pressure, humidity and wind with grADS software and create a global warming module. This research uses 3D model, define, design, and develop. The results of the modeling of the five climate elements consist of the annual average temperature in Indonesia in 2009-2015 which is between 29oC to 30.1oC, the horizontal distribution of the annual average pressure in Indonesia in 2009-2018 is between 800 mBar to 1000 mBar, the horizontal distribution the average annual humidity in Indonesia in 2009 and 2011 ranged between 27-57, in 2012-2015, 2017 and 2018 it ranged between 30-60, during the East Monsoon, the wind circulation moved from northern Indonesia to the southern region Indonesia. During the west monsoon, the wind circulation moves from the southern part of Indonesia to the northern part of Indonesia. The global warming module for SMA/MA produced is feasible to use, this is in accordance with the value given by the validate of 69 which is in the appropriate category and the response of teachers and students through a 91% questionnaire.
An approach of re-organizing input dataset to enhance the quality of emotion ...journalBEEI
The purpose of this paper is to propose an approach of re-organizing input data to recognize emotion based on short signal segments and increase the quality of emotional recognition using physiological signals. MIT's long physiological signal set was divided into two new datasets, with shorter and overlapped segments. Three different classification methods (support vector machine, random forest, and multilayer perceptron) were implemented to identify eight emotional states based on statistical features of each segment in these two datasets. By re-organizing the input dataset, the quality of recognition results was enhanced. The random forest shows the best classification result among three implemented classification methods, with an accuracy of 97.72% for eight emotional states, on the overlapped dataset. This approach shows that, by re-organizing the input dataset, the high accuracy of recognition results can be achieved without the use of EEG and ECG signals.
Parking detection system using background subtraction and HSV color segmentationjournalBEEI
Manual system vehicle parking makes finding vacant parking lots difficult, so it has to check directly to the vacant space. If many people do parking, then the time needed for it is very much or requires many people to handle it. This research develops a real-time parking system to detect parking. The system is designed using the HSV color segmentation method in determining the background image. In addition, the detection process uses the background subtraction method. Applying these two methods requires image preprocessing using several methods such as grayscaling, blurring (low-pass filter). In addition, it is followed by a thresholding and filtering process to get the best image in the detection process. In the process, there is a determination of the ROI to determine the focus area of the object identified as empty parking. The parking detection process produces the best average accuracy of 95.76%. The minimum threshold value of 255 pixels is 0.4. This value is the best value from 33 test data in several criteria, such as the time of capture, composition and color of the vehicle, the shape of the shadow of the object’s environment, and the intensity of light. This parking detection system can be implemented in real-time to determine the position of an empty place.
Quality of service performances of video and voice transmission in universal ...journalBEEI
The universal mobile telecommunications system (UMTS) has distinct benefits in that it supports a wide range of quality of service (QoS) criteria that users require in order to fulfill their requirements. The transmission of video and audio in real-time applications places a high demand on the cellular network, therefore QoS is a major problem in these applications. The ability to provide QoS in the UMTS backbone network necessitates an active QoS mechanism in order to maintain the necessary level of convenience on UMTS networks. For UMTS networks, investigation models for end-to-end QoS, total transmitted and received data, packet loss, and throughput providing techniques are run and assessed and the simulation results are examined. According to the results, appropriate QoS adaption allows for specific voice and video transmission. Finally, by analyzing existing QoS parameters, the QoS performance of 4G/UMTS networks may be improved.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Wideband frequency reconfigurable metamaterial antenna design with double H slots
1. Bulletin of Electrical Engineering and Informatics
Vol. 9, No. 5, October 2020, pp. 1971~1978
ISSN: 2302-9285, DOI: 10.11591/eei.v9i5.2193 1971
Journal homepage: http://beei.org
Wideband frequency reconfigurable metamaterial antenna
design with double H slots
Adamu Y. Iliyasu, Mohamad Rijal Hamid, Mohamad Kamal A. Rahim, Mohd Fairus Mohd Yusoff,
Murtala Aminu-Baba, Mohammed Mustapha Gajibo
Advanced RF and Microwave Research Group, School of Electrical Engineering, Faculty of Engineering,
Universiti Teknoloji Malaysia UTM, Malaysia
Article Info ABSTRACT
Article history:
Received Jan 7, 2020
Revised Mar 3, 2020
Accepted Apr 12, 2020
This paper presents the design of wideband frequency reconfigurable
metamaterial antenna with double H slots. The design is based on the idea
of composite right/left-handed transmission line (CRLH-TL) technique.
Bandwidth enhancement was achieved by utilizing series left-handed
capacitor CL transmission line parameter. The design has several outstanding
advantages which include efficient bandwidth to cover many lower
Application bands with multi frequency operation characteristics.
A comprehensive analysis and simulation were done by using computer
simulation technology (CST) software to determine the performance
and efficiency of the proposed antenna. From the result obtained, the antenna
aquired bandwidth range which covered (2.3-5.2) GHz which is equivalent
to 77% fractional bandwidth. The wideband antenna was reconfigured
by using frequency reconfiguration technique. From the reconfiguration
results, the antenna can be switch from wideband to two single bands which
resonate at 2.4 GHz and 4.2 GHz and to dual band which resonate at 2.4 GHz
and 4.2 GHz. The realized peak gain at 2.4 GHz is 2.28 dBi and 2.58 dBi
for E and H field respectively. The maximum efficiency of 96% was
obtained. The antenna can be use for WLAN, proposed lower 5G band
and cognitive radio system for frequency sencing.
Keywords:
Dual band
Frequency reconfiguration
Metamaterial
Single band
Wideband
This is an open access article under the CC BY-SA license.
Corresponding Author:
Adamu Y. Iliyasu,
Advanced RF and Microwave Rearch Group,
School of Electrical Engineering, Faculty of Engineering,
Universiti Teknoloji Malaysia UTM, 81310 Skudai, Johor Malaysia.
Email: alhaji080@gmail.com
1. INTRODUCTION
Low cost and highly efficient antenna with multi-band characteristics which will provide a solutions
of spectrum congestion and interference is highly needed for wireless communication system. This goal can
be achieved by utilizing metamaterial unique behavior. Metamaterial antennas are the one that can be
improve it without tempering it physical dimension. Russian physicist Victor Veselago pioneer the effect of
metamaterial since 1968 [1]. Experimental work was published by Smith in year 2000 [2]. Metamaterials
posses negative permittivity and negative permeability [3]. In fact purely left handed (PLH) material
does not exist, but can be generated from combination of transmission line parameters or employment of
resonant metamaterial structures like split ring resonator (SRR), complementary split ring resonator (CSRR)
[4]. Basic parameters that form (CRLH-TL) are series capacitance CL, shunt inductance LL which provide
left-handed properties and series inductance LR, shunt capacitance CR to generate right-handed properties [5],
2. ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 9, No. 5, October 2020 : 1971 – 1978
1972
The dispersion behavior for analysys of these parameters can be obtained by using Bloch-Floquet theorem as
represent in (1) [4].
( ) ( ( )) (1)
where and are left/right-handed resonance and and are series and shunt resonance as
presented in (2-5).
√
(2)
√
(3)
√
(4)
√
(5)
CRLH-TL structures can act as resonator when satisfying condition in (6) [6].
(6)
The relationship between bandwidth and capacitance CL of CRLH TL for short-ended antenna is
shows in (7). From the equation we observed that, bandwidth has direct propotion relation with left-handed
capacitance. Which means that, the high the value of lef-handed capacitance CL the high the bandwidth
of the antenna. Figure 1 represent the circuit of single CRLH-TL unt cell with lenth d.
√ (7)
Figure 1. CRLH-TL unit cell [6]
Reconfigurable antennas are considered as antennas with habit of selecting operating parameters
such as polariztion, frequency, or radiation pattern to rearrange it current distribution to achieve the desire
goal [7]. They are classified according to their operating parameters [8]. Previously, various research to
improve the performance of antennas have been done. Among the research include utilizating the effect of
twice unit cell netamaterial structures by [9, 10] to extend antenna bandwidth. Same objective was achieved
in [11, 12] by merging fundamental modes. Subtituting interdigital capacitor IDC with H slot by [13] also
result to bandwidth enhancement. Size miniaturization and tunability was achieved by introducing substrate
integrated waveguide and IDC based on CRLH [14]. Interestingly [15] exploit epsilon negative by using
coplanar strip line with meander for reconfiguration purpose. Author [16] modified monopole antenna by
activating and deactivating circular split ring resonator and obtained multi bands. Also [17] achieved
compound reconfiguration with dual frequency band. Multi band antennas were obtained in [18-22]. From
the overview, up to now, there is limited bandwidth of operation from the latest work done in [12, 13, 23,
24]. However, significant result do exist in [25-27], but they exhibit several disadvantages such as large size,
insufficient bandwidth to cover many application band, limited resonating bands. Therefore, more effort
needs to be put to design compact antenna with wider bandwidth to cover many application bands.
This paper presents the design of wideband frequency reconfigurable metamaterial antenna
with double H slots. The antenna possesses enough bandwidth to cover many application bands. It also
reconfigured by frequency reconfiguration technique to obtain multi band. The design procedure is presented
and discussed in the subsequent sections.
3. Bulletin of Electr Eng & Inf ISSN: 2302-9285
Wideband frequency reconfigurable metamaterial antenna design with double H slots (Adamu Y. Iliyasu)
1973
2. RESEARCH METHOD
Figure 2 shows the physical structure and dimension of the antenna proposed in this paper.
The antenna is design based on the principles design in [13]. The design started by simulating the antenna
with three different value of G2 and G3 (0.5mm, 0.7mm and 1.0mm) to explore the effect of series
capacitance CL for bandwidth enhancement as presented in (7). Two slots with H shape were introduce at
the top patch before applying switch operation for further bandwidth enhancement. Low cost FR4 substrate
with 1.6 mm thickness and dielectric constant of 4.4 was used in this design. The simulation work was done
by using computer simulation technology (CST) Software. After getting the optimized value of G2 and G3,
the proposed antenna have the following dimensions in millimeter: L=30, W=16.8, G1=0.6, G2=G3=1.0,
L1=5.48, L2=10.3, L3=2.7, L4=W2=9.6, W3=2.6, L5=4.6, W1=6.2, W2=9.6 and T=1.0. The wideband
antenna was simulated to study the behavior of current distribution at 2.4 GHz. High concentration of current
distribution at the edge of shorted strip line and sides of the H slot as observed. Figure 3 shows the behavior
of the current distribution at 2.4 GHz.
Figure 2. Proposed antenna
Figure 3. Current distribution at 2.4 GHz
Based on the behavior of current distribution at 2.4 GHz, two slots were created at shorted strip
and one side of H slot. Then parametric studies were taken between the three slots for frequency
reconfigurable purpose. Three PIN diode switches S2, S3, and S4 are assigned at proper position of the three
slots after analysing parametric studies results to achieve the desire goal. Figure 4(a) shows the schematic
diagram of the swich configuration and Figure 4(b) shows the proposed antenna with the pin diode switches.
4. ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 9, No. 5, October 2020 : 1971 – 1978
1974
(a) (b)
Figure 4. (a) Switching diagram, (b) Proposed antenna with PIN dide switches
3. RESULTS AND DISCUSSION
In this section, details of the results obtained in this paper were presented. These results include
optimized value of G2 and G3 for bandwidth enhancement, effect of H slots and frequency reconfiguration.
3.1. Variation of G2 and G3
By varying the thickness of G2 and G3 simultaneously, three different wideband results were
obtained, the results show the significant effect at high band. Table 1 presents the summary of the results for
the effect of varying G2 and G3. Based on the result, 1.0 mm thickness was selected as optimized value of G2
and G3. These results proved the expression in (7).
Table 1. Effect of thickness G2 and G3
G2=G3 (mm) 0.5 0.7 1.0
Bandwidth (GHz) 2.28-4.55 2.31-4.8 2.34-4.9
Fractional Bandwidth % 66.7 72.12 76.35
3.2. Effect of H slot
Introducing H slots shifted bandwidth at high band to target frequency band. The bandwidth
maintained it position at 4.9 GHz with one H slot, while it shifted to 5.2 GHz after introducing the second H
slot. Figure 5 shows the effect of introducing H slots.
Figure 5. Effect of H slots
5. Bulletin of Electr Eng & Inf ISSN: 2302-9285
Wideband frequency reconfigurable metamaterial antenna design with double H slots (Adamu Y. Iliyasu)
1975
3.3. Reconfiguration results
The wideband antenna was reconfigured by frequency reconfiguration technique. Three PIN diode
switches S2, S3, and S4 are used for reconfiguration purpose. The results obtained by reconfiguration
are shows in Figure 6 (a) to (d). The following switch configuration were perfomed and obtained two single
band and one dual band from the wideband antenna. If all switches are in ON state, the antenna maintained it
initial wideband as shows in figure (a). When only switch S3 is ON, single band was obtained which resonate
at 2.4 GHz as in figure (b). Another single band at 4.2 GHz was obtained when only S4 is ON. Lastly, dual
band was obtained by switching all the switches OFF as shown in Figure (d). Table 2 summarizes the results
of all the switch configuration.
(a) (b)
(c) (d)
Figure 6. Reconfiguration results, (a) All switches ON, (b) Only S3 ON, (c) Only S4 ON,
(d) All switches OFF
Table 2. Switch configuration and status
S2 S3 S4 Resonating Band Status
ON ON ON 2.3-5.2 Wideband
OFF ON OFF 2.4 Single Band
OFF OFF ON 4.2 Single Band
OFF OFF OFF 2.4 and 4.2 Dual band
Figure 7 (a) and (b) shows E and H plane radiation pattern at 2.4 GHz while (c) and (d) represents E
and H Plane radiation pattern at 4.2 GHz. The E-Plane shows omnidirectional properties at both frequencies
while H plane shows dipolar at both frequencies. The realized peak gain at 2.4 GHz and 4.2 GHz are 2.58
dBi and 2.28 dBi respectively.Table 3 presents the summary of the results obtained in this work
and compared with the results of the previous similar work.
6. ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 9, No. 5, October 2020 : 1971 – 1978
1976
(a) (b)
(c) (d)
Figure 7. (a) and (b) E and H plane radiation pattern at 2.4 GHz (c)
and (d) E and H plane radiation at 4.2 GHz
Table 3. Result comparison
REF Bandwidth/Bands GHz Electrical Size Remark
[16] 2.0-3.4 0.32 𝝀O × 0.36𝝀O Large size and bandwodth not cover many application bands
[19] 2.4-4.4 0.25 𝝀O × 0.14𝝀O Large size also bandwidth not cover many application bands
[13] 2.23-3.35 0.36 𝝀O × 0.29𝝀O Large with narrow bandwidth
[11] 2.4, 3.5 and 5.5 0.32 𝝀O × 0.36𝝀O Large size
[13] 2.5, 4.7, 5.3 and 8.2 0.33 𝝀O × 0.42𝝀O Large size and less resonating bands
[26] 2.6 and 4.9 0.27 𝝀O × 0.17𝝀O Smaal size, wider bandwidth and resonate in many
application bands
This Work 2.3-5.3, 2.4, 4.2, 2.4 and 4.2 0.13 𝝀O × 0.1𝝀O
4. CONCLUSION
A wideband frequency reconfigurable metamaterial antenna with double H slots has been designed
and presented. The fundamental objective is to enhance the bandwidth of the antenna to cover many
application bands and then reconfigure for multi frequency operation. Bandwidth enhancement was achived
by using series CRLH-TL parametr CL. The result shows direct propotion of CL and antenna bandwidth as
shows in (7). When the value of CL is high, the bandwidth was improved. Finally, the antenna was
reconfigured to usefull application bands 2.4 GHz and 4.2 GHz. The overall results make the antenna
potenrial for wireless communication, future proposed 5G lower band and cognitive raidio system.
ACKNOWLEDGEMENTS
The authors thank the Ministry of Education (MOE) for supporting the research work, Research
Management Center (RMC), School of Postgraduate (SPS), School of Electrical Engineering and Universiti
Teknologi Malaysia (UTM) Johor Bahru for the support of the research under grand no
Q.J130000.3551.06G94. The author would also like to acknowledge all members of Advanced Microwave
and Antenna Lab (AMAL) P18FKE-UTM.
7. Bulletin of Electr Eng & Inf ISSN: 2302-9285
Wideband frequency reconfigurable metamaterial antenna design with double H slots (Adamu Y. Iliyasu)
1977
REFERENCES
[1] Viktor G. Veselago, “The electrodynamics of substances with simultaneously negative values of and μ,”
Physics-Uspekhi, vol. 10, no. 4, 30 April 1968.
[2] D. R. Smith, W. J. Padilla, D. C. Vier, and S. Schultz, “Composite Medium with Simultaneously Negative
Permeability and Permittivity,” Physical review letters, vol. 84, no. 18, pp. 4184- 4187, 2000.
[3] R. Rajkumar and K. Usha Kiran, “A Metamaterial Inspired Compact Open Split Ring Resonator Antenna
for Multiband Operation,” Wireless Personal Communications, vol. 97, no. 1, pp. 951–965, 2017.
[4] A. Lai, K. M. K. H. Leong and T. Itoh, "Infinite Wavelength Resonant Antennas With Monopolar Radiation Pattern
Based on Periodic Structures," in IEEE Transactions on Antennas and Propagation, vol. 55, no. 3, pp. 868-876, 2007.
[5] Atsushi Sanada, Christophe Caloz, And Tatsuo Itoh, “Novel Zeroth-Order Resonance In Composite Right/Handed
Transmission Line Resonators,” in 2003 Asia-Pacific Microwave Conference, 2003.
[6] S. Baek and S. Lim, "Miniaturised zeroth-order antenna on spiral slotted ground plane," in Electronics Letters,
vol. 45, no. 20, pp. 1012-1014, 24 September 2009.
[7] R. Er-rebyiy, J. Zbitou, A. Tajmouati, M. Latrach, A. Errkik and R. Mandry, "A new design of U shaped
reconfigurable antenna based on PIN diodes," 2017 International Conference on Wireless Technologies, Embedded
and Intelligent Systems (WITS), Fez, pp. 1-4, 2017.
[8] T. Singh, K. Arif, and A. Heena, “Design and Analysis of Reconfigurable Microstrip Antenna for Cognitive Radio
Applications,” wireless personal communications, vol. 98, no. 2, pp. 2163–2185, 2018.
[9] L. Liu and B. Wang, "A Broadband and Electrically Small Planar Monopole Employing Metamaterial
Transmission Line," in IEEE Antennas and Wireless Propagation Letters, vol. 14, pp. 1018-1021, 2015.
[10] C. Zhou, G. Wang, J. Liang, Y. Wang and B. Zong, "Broadband Antenna Employing Simplified MTLs for
WLAN/WiMAX Applications," in IEEE Antennas and Wireless Propagation Letters, vol. 13, pp. 595-598, 2014.
[11] H. Lee, D. Woo and S. Nam, "Compact and Bandwidth-Enhanced Asymmetric Coplanar Waveguide (ACPW)
Antenna Using CRLH-TL and Modified Ground Plane," in IEEE Antennas and Wireless Propagation Letters,
vol. 15, pp. 810-813, 2016.
[12] P. Chi and Y. Shih, "Compact and Bandwidth-Enhanced Zeroth-Order Resonant Antenna," in IEEE Antennas and
Wireless Propagation Letters, vol. 14, pp. 285-288, 2015.
[13] Bashir Danjuma Bala, “Metamaterial Antenna Using Resonant And Non-Resonant Approach For Multiband And
Wideband Application,” PhD Thesis, Universiti Teknologi Malaysia, 2014.
[14] S. Somarith, K. Hyunseong and L. Sungjoon, "Frequency Reconfigurable and Miniaturized Substrate Integrated
Waveguide Interdigital Capacitor (SIW-IDC) Antenna," in IEEE Transactions on Antennas and Propagation,
vol. 62, no. 3, pp. 1039-1045, March 2014.
[15] M. Terrovitis et al., “A Compact Frequency Reconfigurable Cps-Like Metamaterial-Inspired Antenna,” Microwave
And Optical Technology Letters, vol. 59, no. 3, pp. 596–601, 2017.
[16] M. A. R. M. R. I. F. M. T. Islam, “Circularly split-ring-resonator-based frequency-reconfigurable antenna,” Applied
Physics A, vol. 123, no. 1, pp. 1–6, 2017.
[17] Amjad Iqbal, Amor Smida, Nazih Khaddaj Mallat, Ridha Ghayoula, Issa Elfergani, Jonathan Rodriguez, Sunghwan
Kim, "Frequency and Pattern Reconfigurable Antenna for Emerging Wireless Communication Systems,"
in Electronics, vol. 8, no. 4, 2019.
[18] H. Huang, Y. Liu, S. Zhang and S. Gong, "Multiband Metamaterial-Loaded Monopole Antenna for
WLAN/WiMAX Applications," in IEEE Antennas and Wireless Propagation Letters, vol. 14, pp. 662-665, 2015.
[19] A. Kumar, J. Mohan and H. Gupta, "Microstrip patch antenna loaded with metamaterial for multiband
applications," 2016 International Conference on Signal Processing and Communication (ICSC), Noida, pp. 43-47, 2016.
[20] R. Rajkumar and K. U. Kiran, “A compact metamaterial multiband antenna for WLAN/WiMAX/ITU band
applications,” AEU-International Journal of Electronics and Communications, vol. 70, no. 5, pp. 599–604, May 2016.
[21] Rengasamy Rajkumar, Kommuri Usha Kiran, “Multiband monopole antenna loaded with Complementary Split
Ring Resonator and C-shaped slots,” AEU-International Journal of Electronics and Communications, vol. 75,
pp. 8–14, 2017.
[22] A. Y. Iliyasu, M. Rijal, B. Hamid, and M. K. A. Rahim, “Wideband frequency reconfigurable metamaterial antenna
employing SRR and CSRR for WLAN application,” Indonesian Journal of Electrical Engineering and Computer
Science (IJEECS), vol. 15, no. 3, pp. 1436–1442, 2019.
[23] B. Niu and Q. Feng, "Bandwidth Enhancement of Asymmetric Coplanar Waveguide (ACPW)-Fed Antenna Based
on Composite Right/Left-Handed Transmission Line," in IEEE Antennas and Wireless Propagation Letters,
vol. 12, pp. 563-566, 2013.
[24] Naveen Mishra, Ashish Gupta, Raghvendra Kumar Chaudhary, “A Compact Cpw-Fed Wideband Metamaterial
Antenna Using Ω-Shaped Interdigital Capacitor For Mobile Application,” Microwave And Optical Technology
Letters, vol. 57, no. 11, pp. 2558–2562, 2015.
[25] Rajeshkumar V. and Raghavan S., “A compact metamaterial inspired triple band antenna for reconfigurable
WLAN/WiMAX applications,” AEU-International Journal of Electronics and Communications, vol. 69, no. 1,
pp. 274–280, 2015.
[26] A. B. Jagadeesan, A. Alphones, M. F. Karim and L. C. Ong, "Metamaterial based reconfigurable multiband
antenna," 2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio
Science Meeting, Vancouver, BC, pp. 2389-2390, 2015.
[27] K. Kandasamy, B. Majumder, J. Mukherjee and K. P. Ray, "Design of SRR loaded reconfigurable antenna for
UWB and narrow band applications," 2015 IEEE International Symposium on Antennas and Propagation &
USNC/URSI National Radio Science Meeting, Vancouver, BC, pp. 1192-1193, 2015.
8. ISSN: 2302-9285
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1978
BIOGRAPHIES OF AUTHORS
Adamu Yau Iliyasu obtaine B. Eng in Electrical Engineering from Kano. University of Science
&Technology, Wudi in 2007, Obtained M.Sc in Electrical & Computer Engineering in
Meliksah/Erciyes University Turkey 2014. Currently PhD Student in University Technology
Malaysia. School of Electrical Engineering. Malaysia. Johor, His research area is Frequency
Reconfigurable Metamaterial Antenna Design. Have been with Kano University of Science and
Technology Wudil since 2011 as lecturer.
Mohanmad Rijal Hamid received the M.Sc. degrees in communication engineering from the
Universiti Teknologi Malaysia, Johor Bahru, Malaysia, in 2001 and the Ph.D Degree at the
University of Birmingham, Birmingham, U.K. in 2011. He has been with Universiti Teknologi
Malaysia (UTM) at the School of Electrical Engineering, Faculty Of Engineering, UTM, since
1999. Currently his position is a Senior Lecturer. His major research interest is reconfigurable
antenna design for multimode wireless applications.
Mohamad Kamal A. Rahim is a Professor at School of Electrical Engineering, UTM Skudai
Johor. Graduated with a Bachelor of Electrical Engineering from the University of Strathclyde,
UK (1987), a Master of Electrical Engineering (Communication) degree from the University of
New South Wales, Australia (1992) and a Doctor of Philosophy (Electrical Engineering) from
the University of Birmingham, UK (2003). His research interest includes the areas of design of
Dielectric resonator antennas, microstrip antennas, small antennas, microwave sensors, RFID
antennas for readers and tags, Multi-function antennas, microwave circuits, EBG, artificial
magnetic conductors, metamaterials, array antennas, wearable antennas, textile antenna, smart
antennas, computer aided design for antennas and design of millimeter frequency antennas for
5G. He has published over 400 articles. He has supervised more than 20 Phd, 50 Master which
includes thesis, project report, dissertation and more than 100 undergraduate students. 10 Phd
and 50 Master students have been graduated through his supervision.
Mohd Fairus is a graduate faculty member of the Faculty of Electrical Engineering, University
Technology Malaysia (UTM). He joined UTM in 2002 as a Tutor. He received his Bachelor in
Engineering (Electrical-Telecommunication) in 2002 and Master of Electrical Engineering
(Electrical - Electronics and Telecommunications) in 2005 from University Technology
Malaysia. He obtained his Ph.D. in 2012 from University of Rennes 1, France in area of Signal
Processing and Telecommunication. His main research interests and areas are antenna design,
millimeter waves and microwave devices.
Murtala Aminu-Baba obtained his first degree in 2010 from Abubakar Tafawa Balewa
University Bauchi, Nigeria (ATBU) in Electrical/Electronics Engineering. He further received
his MSc. Degree in Information Technology from the University of Wolverhampton, U.K, in
2013. He is currently pursuing his PhD in the field of metamaterial antenna design for MIMO
applications and have been with Abubakar Tafawa Balewa University Bauchi since 2014 as a
lecturer.
Mohammed Gajibo Mustapha obtained his Diploma in telecommunication Engineering at
Multimedia University Melaka in 2009. He then obtained his first degree in in
Electrical/Electronics Engineering at University of Sunderland U.K in 2013. He further obtained
his Masters MEng. In Electrical and Telecommunication engineering at University Technology
Malaysia in 2015. He is currently rounding up his PhD in the field of metamaterial absorbers and
reflectors at University Technology Malaysia.