This work builds a metamaterial (MTM) superstrate loaded on a patch of microstrip antenna for wireless communications. The MTM superstrate is made up of four G-shaped resonators on FR-4 substrate with a relative permittivity of 4.4 and has a total area of (8×16) mm2, and is higher than the patch. The MTM superstrate increases antenna gain while also raising the input reflection coefficient. When it is 9 mm above the patch, the gain increased from 3.28 dB to 6.02 dB, and when it is 7 mm above the patch, the input reflection coefficient was enhanced from -31.217 dB to -45.8 dB. When the MTM superstrate loaded antenna was compared to the traditional unloaded antenna, it was discovered that metamaterials have a lot of potential for improving antenna performance.
Presentation of PhD Thesis: "A perspective on metasurfaces, circuits, holograms and invisibility". Carlo Andrea Gonano, Politecnico di Milano, Italy, 26 January 2016.
Design of Miniaturized Multiband Patch Antenna Using CSRR for WLAN/WiMAX Appl...TELKOMNIKA JOURNAL
A novel miniaturized multiband, single-feed microstrip patch antenna is presented in this paper for
WLAN and WiMAX applications. Both size reduction and multiband are obtained by etching the Multiple
Complementary Split Ring Resonators (MC-SRR) on the ground plane of the normal patch antenna. At
first, the normal patch antenna produces a single band of 5.15 GHz; 200 MHz (5.0500~5.2499).
Subsequently, a Single Circular Split Ring Resonator (SC-SRR) is etched on the ground plane and
produces a triple band of: 3.25 GHz; 288 MHz (3.1085~3.3964), 4.5 GHz; 101.3 MHz (4.4488~4.5501),
and 5.22 GHz; 220 MHz (5.1191~5.3400) and Double Single Circular Split Ring Resonator (DC-MCSRR)
with: 2.99 GHz; 60.7 MHz (2.9574~3.0181), 3.57 GHz; 324.7 MHz (3.4065~3.7312), and 5.1413 GHz;
115.4 MHz (5.0817~5.1971). The working bandwidths cover the desired frequency bands of WLAN
5.2 GHz and WiMAX 3.3/3.5 GHz. The proposed (MC-SRR) antenna can be employed to wireless
communication systems due to its simplicity in design, compactness and miniaturization.
Presentation of PhD Thesis: "A perspective on metasurfaces, circuits, holograms and invisibility". Carlo Andrea Gonano, Politecnico di Milano, Italy, 26 January 2016.
Design of Miniaturized Multiband Patch Antenna Using CSRR for WLAN/WiMAX Appl...TELKOMNIKA JOURNAL
A novel miniaturized multiband, single-feed microstrip patch antenna is presented in this paper for
WLAN and WiMAX applications. Both size reduction and multiband are obtained by etching the Multiple
Complementary Split Ring Resonators (MC-SRR) on the ground plane of the normal patch antenna. At
first, the normal patch antenna produces a single band of 5.15 GHz; 200 MHz (5.0500~5.2499).
Subsequently, a Single Circular Split Ring Resonator (SC-SRR) is etched on the ground plane and
produces a triple band of: 3.25 GHz; 288 MHz (3.1085~3.3964), 4.5 GHz; 101.3 MHz (4.4488~4.5501),
and 5.22 GHz; 220 MHz (5.1191~5.3400) and Double Single Circular Split Ring Resonator (DC-MCSRR)
with: 2.99 GHz; 60.7 MHz (2.9574~3.0181), 3.57 GHz; 324.7 MHz (3.4065~3.7312), and 5.1413 GHz;
115.4 MHz (5.0817~5.1971). The working bandwidths cover the desired frequency bands of WLAN
5.2 GHz and WiMAX 3.3/3.5 GHz. The proposed (MC-SRR) antenna can be employed to wireless
communication systems due to its simplicity in design, compactness and miniaturization.
This slide describes design and simulation about the micro strip patch antenna using HFSS software.study the return characteristics,gain(db)and radiation pattern
As the given frequency & substrate thickness, we calculate substrate length,width & patch length.you can refer theory in "ANTENNA THEORY" by C.A.Balanis
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
DESIGN OF RECTANGULAR PATCH ANTEENA USING METAMATERIAL SUBSTRATEPrateek Kumar
Dissertation part-1 presentation on design of rectangular patch antenna using metamaterial substrate by Prateek Kumar from RUSTAMJI INSTITUTE OF TECHNOLOGY BORDER SECURITY FORCE TEKANPUR GWALIOR (M.P).
High impedance surface_his_ris_amc_nurmerical_analytical_analysis利 金
Features of an AMC such as dispersion diagram and reflection phase are discussed numerically and analytically, along with their experimental set up. Parametric study on polarization (TE and TM,substrate thickness and dielectric constant and unit cell size and spacing is carried out. Their design equations are included from different references.
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).
A Miniature Microstrip Antenna Array using Circular Shaped Dumbbell for ISM B...IJECEIAES
The aim of this work is the achievement, and the validation of a small microstrip patch antenna array using a circular shaped dumbbell defected ground structure. This work has been dividing into two stages: The first step is to miniaturize a microstrip patch antenna resonating at 5.8GHz, which operate in the Industrial Scientific Medical band (ISM) and the second is to use a circular defected ground structure to shift the resonance frequency of the antenna array from 5.8GHz to 2.45GHz. At last, a miniaturization up to 74.47%, relative to the original microstrip antenna array has accomplished. The antenna structure has designed, optimized and miniaturized using CST MW Studio. The obtained results have compared with Ansoft’s HFSS electromagnetic solver. The antenna array has fabricated on FR-4 substrate, and its reflection coefficient is measured.
This slide describes design and simulation about the micro strip patch antenna using HFSS software.study the return characteristics,gain(db)and radiation pattern
As the given frequency & substrate thickness, we calculate substrate length,width & patch length.you can refer theory in "ANTENNA THEORY" by C.A.Balanis
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
DESIGN OF RECTANGULAR PATCH ANTEENA USING METAMATERIAL SUBSTRATEPrateek Kumar
Dissertation part-1 presentation on design of rectangular patch antenna using metamaterial substrate by Prateek Kumar from RUSTAMJI INSTITUTE OF TECHNOLOGY BORDER SECURITY FORCE TEKANPUR GWALIOR (M.P).
High impedance surface_his_ris_amc_nurmerical_analytical_analysis利 金
Features of an AMC such as dispersion diagram and reflection phase are discussed numerically and analytically, along with their experimental set up. Parametric study on polarization (TE and TM,substrate thickness and dielectric constant and unit cell size and spacing is carried out. Their design equations are included from different references.
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).
A Miniature Microstrip Antenna Array using Circular Shaped Dumbbell for ISM B...IJECEIAES
The aim of this work is the achievement, and the validation of a small microstrip patch antenna array using a circular shaped dumbbell defected ground structure. This work has been dividing into two stages: The first step is to miniaturize a microstrip patch antenna resonating at 5.8GHz, which operate in the Industrial Scientific Medical band (ISM) and the second is to use a circular defected ground structure to shift the resonance frequency of the antenna array from 5.8GHz to 2.45GHz. At last, a miniaturization up to 74.47%, relative to the original microstrip antenna array has accomplished. The antenna structure has designed, optimized and miniaturized using CST MW Studio. The obtained results have compared with Ansoft’s HFSS electromagnetic solver. The antenna array has fabricated on FR-4 substrate, and its reflection coefficient is measured.
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 Study of a Miniaturized Multi-layered Antenna-in-package for 2.4 GHZ ...IJECEIAES
This paper proposes a novel miniaturization technique to enhance the radiation properties of small multi-layer patch antenna used in packaged circuits. The multilayered antenna design is composed of three layers with different shapes. An enhancement on the radiation properties has been obtained by optimizing the geometry of the radiated element and the parasitic conductor of the middle layer. The whole design has been implemented on the FR4 substrate with dielectric constant of 4.4, thickness of 1.6 mm and Copper thickness of 5 m. The first layer is a driven element while second and the third layer are parasitic patch elements. The optimized multilayer antenna has a very small size of . Considering the small size of the antenna, a detailed study of the parameter affecting the radiation has been considered to force the antenna to operate at 2.4 GHz band. Miniaturization techniques based on the current distribution have been also taken into account to shift down the resonant frequency and reduces more and more the antenna size at the designed operating frequency. The miniaturized antenna maintains performant radiation characteristics in terms of reflexion coefficient, bandwidth and directivity. All developed antennas are simulated using the commercial Electromagnetic CST Microwave Studio software. Achieved results demonstrate a good performance with low cost and compact size
A 2.45 GHz microstrip antenna with harmonics suppression capability by using ...journalBEEI
In this work, a microstrip patch antenna with an inset feed and defected ground structure (DGS) is designed at the resonant frequency of 2.45 GHz. The antenna is designed on a FR-4 substrate with a dielectric constant, εr of 4.5, loss tangent, tan δ of 0.019 and thickness, h of 1.6 mm. The technique of DGS is used to avoid the use of additional circuits in the antenna to suppress the harmonics. By introducing a single and additional slots DGS at both ends on the antenna ground plane, the proposed microstrip patch antenna is able to suppress the higher order harmonics. The reflection coefficient, S11 is -38.75 dB at 2.45 GHz. The proposed antenna have suppressed the higher order harmonics effectively from -38.04 dB to -2.61 dB at 4.54 GHz and from -13.08 dB to -1.38 dB at 5.76 GHz. The prototype of the antenna is fabricated for the verification of the design. The simulated and measured results are found to be in a good agreement.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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 Compact Multiband Metamaterial based Microstrip Patch Antenna for Wireless ...IJERA Editor
In this paper, a metamaterial based compact multiband microstrip antenna is proposed which can give high gain and directivity. Metamaterials are periodic structures and have been intensively investigated due to the particular features such as ultra-refraction phenomenon and negative permittivity and/or permeability. A metamaterialbased microstrip patch antenna with enhanced characteristics and multi band operation will be investigated in this work. The multiple frequency operation will be achieved by varying the capacitance of the metamaterial structure with the help of metallic loadings placed in each metamaterial unit cells. The potential impacts will be miniaturization, reduced cost and reduced power consumption since multiple antennas operating at different frequencies are replaced by a single antenna which can operate at multiple frequencies. The proposed microstrip patch antenna will have its frequencies of operation in the L, S and C bands. The proposed structure is simulated using Agilent Advanced Design System (ADS) 2011.05. It is then fabricated on the FR4 substrate and the performance of the fabricated antenna is measured using the Vector Network Analyzer (VNA)
Bandwidth and gain enhancement of a circular microstrip antenna using a DNG s...journalBEEI
This paper present the design of a circular patch microstrip antenna with enhancement in terms of bandwidth and gain using a dielectric double negative (DNG) split ring metamaterial radome. This radome is positioned on top of the CP antenna operating from 5.2 GHz to 6.4 GHz. The metamaterial radome comprises of two alternate split rings of negative permittivity, permeability and refractive index. The circular microstrip antenna bandwidth of 430 MHz has been realized by the presence of DNG metamaterial radome compared to 220 MHz without the radome. The gain has been increased as well from 1.84 dBi to 3.87 dBi.
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.
Microstrip Rectangular Monopole Antennas with Defected Ground for UWB Applica...IJECEIAES
This paper presents the design of new compact antennas for ultra wide band applications. Each antenna consists of a rectangular patch fed by 50Ω microstrip transmission line and the ground element is a defected ground structure (DGS). The aim of this study is to improve the bandwidth of these antennas by using DGS and the modification geometry of rectangular structure, which gives new compact antennas for UWB applications. The input impedance bandwidth of the antennas with S11<-10dB is more than 10GHz, from 3GHz to more than 14 GHz. The proposed antennas are investigated and optimized by using CST microwave studio, they are validated by using another electromagnetic solver Ansoft HFSS. The measured parameters present good agreement with simulation. The final antenna structures offer excellent performances for UWB system.
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.
5G Fixed Beam Switching on Microstrip Patch Antenna IJECEIAES
5G technology is using millimeter-wave band to improve the wireless communication system. However, narrow transmitter and receiver beams have caused the beam coverage area to be limited. Due to propagation limitations of mm wave band, beam forming technology with multi-beam based communication system, has been focused to overcome the problem. In this letter, a fixed beam switching method is introduced. By changing the switches, four different configurations of patch array antennas are designed to investigate their performances in terms of radiation patterns, beam forming angle, gain, half-power bandwidth and impedance bandwidth at 28 GHz operating frequency for 5G application. Mircostrip antenna is preferred due to its low profile, easy in feeding and array configurations. Three different beam directions had been formed at -15°, 0°, and 15° with half-power bandwidth of range 45˚ to 50˚.
Design and Optimization of a High Gain Multiband Patch Antenna for Millimeter...IJECEIAES
This paper presents an enhanced Quadri-band microstrip patch antenna, using defective slots in the ground plane, designed to operate in the millimeter wave band, formulated using cavity model and simulated by an EM-simulator, based on finite element method: HFSSv15 (High Frequency Structure Simulator). The proposed antenna incorporates two symmetric patterns of “U” shaped slots with an “I” shaped slot engraved in the middle of the ground plane. The resulting antenna has four frequency bands; the first resonant frequency is located in the Ka band, at about 27Ghz, the second at nearly 35Ghz, the third at 41Ghz and the last one at 51GHz. Those resonant frequencies could be shifted by tuning the slots dimensions introduced if the ground plane of the proposed antenna
This paper presented the design of MIMO 1x8 antenna operating at 38 GHz for future 5G applications. The antenna used the Rogers RT / duroid 5880 substrate with a thickness of 0.787 mm and a dielectric constant of 2.2. This antenna has 1x8 elements with 13.4 dBi of gain and the return loss of -15.76 dB. It has approximately 1.294 GHz bandwidth within the range of 37.485 GHz-38.779 GHz. The comparison performances between both antennas MIMO 1x4 and 1x8 are also discussed. It is shown that both radiation patterns are similar. The increasing number of elements affect to the gain and frequency. The proposed antenna meets the 5G requirements.
TRI-BAND MICROSTRIP PATCH ANTENNA FOR S-BAND NANO SATELLITE APPLICATION USING...ijsrd.com
It's the generation of tiny satellites which basically needs all its components to be miniature. The product proposed here is one such component, a tri band micro strip patch antenna operating at 2.6GHz, 3.6GHz S-band frequencies and 5.8 GHz. This real-time project work deals with a rectangular patch antenna operating at different frequencies working for various applications. The proposed S-Band Patch antenna is being designed and simulated using HFSS software. Obtaining optimum bandwidth efficiency by choosing suitable size without affecting any other parameters of the antenna is the challenge taken over in this project. The low profile, less weight patch antenna has antenna element of physical dimension 40x40x2.6mm .The substrate material being used is Alumina with dielectric constant 9.6. This antenna is designed to be used for TTC and payload downlink purposes. The designed patch array antenna meets all the parametric needs for a Polar orbiting satellite at Low Earth Orbit (LEO) region.
Similar to Microstrip patch antenna with metamaterial using superstrate technique for wireless communication (20)
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.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
About
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.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
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.
Key Features
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.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Microstrip patch antenna with metamaterial using superstrate technique for wireless communication
1. Bulletin of Electrical Engineering and Informatics
Vol. 10, No. 4, August 2021, pp. 2055~2061
ISSN: 2302-9285, DOI: 10.11591/eei.v10i4.2722 2055
Journal homepage: http://beei.org
Microstrip patch antenna with metamaterial using superstrate
technique for wireless communication
Rasha Mahdi Salih, Ali Khalid Jassim
Electrical Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq
Article Info ABSTRACT
Article history:
Received Sep 11, 2020
Revised Apr 29, 2021
Accepted May 25, 2021
This work builds a metamaterial (MTM) superstrate loaded on a patch of
microstrip antenna for wireless communications. The MTM superstrate is
made up of four G-shaped resonators on FR-4 substrate with a relative
permittivity of 4.4 and has a total area of (8×16) mm2
, and is higher than the
patch. The MTM superstrate increases antenna gain while also raising the
input reflection coefficient. When it is 9 mm above the patch, the gain
increased from 3.28 dB to 6.02 dB, and when it is 7 mm above the patch, the
input reflection coefficient was enhanced from -31.217 dB to -45.8 dB. When
the MTM superstrate loaded antenna was compared to the traditional
unloaded antenna, it was discovered that metamaterials have a lot of potential
for improving antenna performance.
Keywords:
Input reflection coefficient
Metamaterial
Microstrip antenna
Superstrate
This is an open access article under the CC BY-SA license.
Corresponding Author:
Rasha Mahdi Salih
Department of Electrical Engineering
Mustansiriyah University
Baghdad, Iraq
Email: Asdfx7871@gmail.com
1. INTRODUCTION
The special properties of metamaterials have enticed scientists to develop highly efficient antennas
for future wireless communication [1]. No other ordinary/naturally occurring metamaterial has the property
that a metamaterial does [2]-[6]. Metamaterials are man-made structures that are engineered to have
properties that aren't found in nature. Veselago introduced the first metamaterial definition [7]-[9].
Metamaterials are made up of unit cells that are organized in a regular pattern [10]-[15]. Tiny metallic
resonators with a duration much shorter than the wavelength make up the unit cells. Different shapes are
possible for the unit cell. Metamaterial structures may be used to miniaturize a large antenna, add a second
resonance to a multiband antenna, increase the gain of a conventional antenna, increase the bandwidth of a
narrow band antenna, and add a second resonance to a multiband antenna [16]-[25]. The metamaterial's
exotic properties can be removed to achieve all of the antenna's aforementioned properties. In this study, we
propose a metamaterials unit cell to obtain resonances at 6 GHz. The unit cell is a G-shaped split ring
resonator (GSRR). The dielectric constant of the usable FR4 substrate is 4.4 and the height is 1.6 mm.
2. DESIGN OF THE METASURFACE UNIT CELL
The proposed metamaterial unit cell is made up of four symmetrically aligned GSRR. Placing the
cell in the middle determines the medium parameters. In Figure 1, the proposed GSRR's extensive dimension
layout and the electrical circuit represented it is. Table 1 shows the dimensions of the proposed metasurface
unit cell. The input reflection cofficient (S11) of the metasurface unit cell as shown in Figure 2.
2. ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 10, No. 4, August 2021 : 2055 – 2061
2056
(a) (b)
Figure 1. These figures are; (a) front view for the unit cell, (b) the unit cell's equivalent circuit
Table 1. Dimensions of metasurface unit cell
W1=0.55 W2=0.28 W3=0.55 L=8 W=8
L1=3.86 L2=2.76 L3=0.55 L4=2.76 L5=1.65
Figure 2. (S11) of the metasurface unit cell
3. DESIGN OF PROPOSED MICROSTRIP ANTENNA
The proposed antenna consists of a ground plane and a 1.6 mm thick FR4 dielectric substrate, and a
relative permittivity of 4.4. The microstrip antenna operates at 7.26 GHz, the microstrip patch antenna was
developed. Table 2 and Table 3 display the design parameters for the microstrip antenna as shown in
Figure 3.
(a) (b)
Figure 3. These figures are; (a) the patch for proposed microstrip antenna, (b) the ground plane for proposed
microstrip antenna
3. Bulletin of Electr Eng & Inf ISSN: 2302-9285
Microstrip patch antenna with metamaterial using superstrate technique … (Rasha Mahdi Salih)
2057
Table 2. Dimensions for the proposed microstrip antenna
Symbol Value (mm)
m1 3
m2 2
L 5
N 1
W 4
U 4.03
S 9
P 8
Table 3. Dimensions for the proposed microstrip antenna
Parameter Quality value (mm)
Lg Length of ground 16
Wg Width of ground 10
Ht thickness of the copper 0.035
Ls Length of substrate 16
Hs Height of substrate 1.6
Ws Width of substrate 10
Lf Length of the feed line 4.13
Wf Width of the feed line 2
The microstrip antenna's input reflection coefficient was calculated at 7.26 GHz, and it was
discovered that the proposed antenna had an input reflection coefficient of -31.217 dB, as shown in Figure 4.
The gain of the microstrip patch antenna at 7.26 GHz is 3.28 dB as shown in Figure 5.
Figure 4. Input reflection coefficient for proposed antenna
Figure 5. The gain for microstrip proposed antenna
4. METAMATERIAL SUPERSTRATE ANALYSIS
The geometrical structure of a metamaterial superstrate made up of a (2×1) cell array of the GSRR
unit cell is shown in Figure 6 (a), Figure 6 (b), and Figure 6 (c) show viewpoint and side views of the
proposed antenna. The MTM superstrate is used to cover the typical antenna's patch without increasing the
total antenna area, i.e. the planer areas. The CST microwave studio package, which is based on the finite
integration technique, was used to analyze the proposed antenna.
4. ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 10, No. 4, August 2021 : 2055 – 2061
2058
(a) (b) (c)
Figure 6. These figures are, (a) MTM superstrate geometrical structure, (b) side view, (c) perspective view
5. PARAMETRIC STUDY
CST's parameter sweep option was used to carry out the parametric studies to obtain maximum
enhancement in gain and the input reflection coefficient of the proposed antenna. Figure 7 and Figure 8
illustrate the variation of the gain and the input reflection coefficient, respectively, at 7.26 GHz of the
proposed antenna with the amendment in the separation d (where d is the distance between the patch and the
metamaterial superstrate). Maximum gain is obtained for d=9 mm and the maximum S11 is obtained at the
distance d=7 mm.
To obtain the optimum gain enhancement of the proposed antenna, parametric studies were carried
out using the parameter sweep option in CST. Figure 7 and Figure 8 show the difference in gain and S11,
respectively, of the designed antenna at 7.26 GHz after the distance was modified. At a distance of 9 mm, the
maximum gain is obtained, and the maximum S11 is obtained for d=7 mm.
The cavity effect can be used to describe the proposed antenna gain increase. Arises when the GSRR
MTM superstrate is raised above the patch at a suitable distance. According to snell's law of refraction, a
medium with a low refractive index scatters electromagnetic waves away from the main source and in the
direction of the medium's normal. The surface this function increases the proposed antenna's directivity
significantly. The MTM superstrate acts as a highly reflective surface, making the antenna extremely
effective. The existence of MTM superstrate also affects the antenna's field distribution. The proposed
antenna's overall gain would be improved by making it more homogeneous.
Figure 7. Gain parametric analysis for various distances
Figure 8. S11 parametric analysis for different distances
5. Bulletin of Electr Eng & Inf ISSN: 2302-9285
Microstrip patch antenna with metamaterial using superstrate technique … (Rasha Mahdi Salih)
2059
After reviewing the parametric study results, the distance to achieve the best result for S11 is d=7 as
shown in Figure 9. Figure 10 shows the frequencies that will be used if we set a distance of 9 mm. At d=9,
the maximum gain is reached, as illustrated in Figure 11.
Figure 9. The input reflection coefficient at the distance 7 mm
Figure 10. Input reflection coefficient at the distance 9 mm
Figure 11. The gain at the distance 9 mm
6. CONCLUSION
For wireless communications, an MTM superstrate loaded on the patch of microstrip antenna is built
in this paper. The MTM superstrate has a total area of (8×16) mm2
and is made up of four G-shaped
resonators put on a substrate that is made of FR-4 with a relative permittivity of 4.4. The MTM superstrate is
higher than the patch. That increases the antenna gain while also raising the input reflection coefficient when
it is located at 9 mm and 7 mm above the patch. When the MTM superstrate-loaded antenna was compared to
the traditional unloaded power, it was discovered that metamaterials have a lot of potential for improving
antenna performance.
ACKNOWLEDGEMENTS
The authors would like to express their gratitude to Mustansiriyah University
(www.uomustansiriyha.edu.iq) in Baghdad, Iraq, for their assistance with this work.
6. ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 10, No. 4, August 2021 : 2055 – 2061
2060
REFERENCES
[1] T. Ali, S. Pathan, and R. Biradar, “Frequency Reconfigurable and Metamaterial Antennas Design Techniques‐
Present and Future Research Directions,” Internet Technology Letters, vol. 1, no. 10, p. e19, 2018, doi:
10.1002/itl2019.
[2] V. G. Veselago, “The electrodynamics of substances with simultaneously negative values of and μ,” Soviet physics
uspekhi, vol. 10, no. 4, pp. 509-514, 1968.
[3] M. Lapine and S. Tretyakov,” Contemporary notes on metamaterials,” IET microwaves, antennas & propagation,
vol. 1, no. 1, pp. 3-11, 2007, doi: 10.1049/iet-map:20050307.
[4] T. Ali, M. Khaleeq, S. Pathan, and R. Biradar, “A multiband antenna loaded with metamaterial and slots for
GPS/WLAN/WiMAX applications,” Microwave and Optical Technology Letters, vol. 60, no. 1, pp. 79-85, 2018,
doi: 10.1002/mop.30921.
[5] Tanweer Ali and Rajashekhar C. Biradar, “A Miniaturized Volkswagen Logo UWB Antenna with Slotted Ground
Structure and Metamaterial for GPS,” Progress in Electromagnetics Research C, vol. 72, pp. 29-41, 2017, doi:
10.2528/PIERC16120109.
[6] Y. Dong and T. Itoh, "Metamaterial-Based Antennas," in Proceedings of the IEEE, vol. 100, no. 7, pp. 2271-2285,
July 2012, doi: 10.1109/JPROC.2012.2187631.
[7] Y. Dong, H. Toyao and T. Itoh, "Design and Characterization of Miniaturized Patch Antennas Loaded With
Complementary Split-Ring Resonators," in IEEE Transactions on Antennas and Propagation, vol. 60, no. 2, pp.
772-785, Feb. 2012, doi: 10.1109/TAP.2011.2173120.
[8] F. Raval, Y. P. Kosta, and H. Joshi, “Reduced size patch antenna using complementary split ring resonator as
defected ground plane,” AEU-International Journal of Electronics and Communications, vol. 69, no. 8, pp. 1126-
1133, 2015, doi: 10.1016/j.aeue.2015.04.013.
[9] Yang Cao, Xing Yu, Hongquan Feng, Rubing Han and Yuanyun Liu, "Waveguide demonstration of active
frequency selective surface in K-band," 2016 Progress in Electromagnetic Research Symposium (PIERS), 2016, pp.
3735-3739, doi: 10.1109/PIERS.2016.7735414.
[10] D. R. Smith, D. C. Vier, Th. Koschny, and C. M. Soukoulis, “Electromagnetic parameter retrieval from
inhomogeneous metamaterials,” Physical review E, vol. 71, no. 3, p. 036617, 2005.
[11] Z. Szabó, G. Park, R. Hedge and E. Li, "A Unique Extraction of Metamaterial Parameters Based on Kramers–
Kronig Relationship," in IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 10, pp. 2646-2653,
Oct. 2010, doi: 10.1109/TMTT.2010.2065310.
[12] A. A. Jabber, A. K. Jassim, and R. H. Thaher, “Compact reconfigurable PIFA antenna for wireless applications,”
Telkomnika, vol. 18, no. 2, pp. 595–602, 2020, doi: 10.12928/telkomnika.v18i2.13427.
[13] Z. Szabó, G. Park, R. Hedge and E. Li, "A Unique Extraction of Metamaterial Parameters Based on Kramers–
Kronig Relationship," in IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 10, pp. 2646-2653,
Oct. 2010, doi: 10.1109/TMTT.2010.2065310.
[14] A. Benedetti, C. Sibilia, and M. Bertolotti, “Wideband negative magnetic permeability materials (NMPM) with
composite metal-semiconductor structures based on the Drude model, and applications to negative-refractive index
(NIM),” Optics Express, vol. 15, no. 11, pp. 6534-6545, 2007, doi: 10.1364/OE.15.006534.
[15] J. B. Pendry, A. J. Holden, D. J. Robbins, and W. J. Stewart, “Low-frequency plasmons in thin-wire structures,”
Journal of Physics: Condensed Matter, vol. 10, no. 22, p. 4785, 1998, doi: 10.1088/0953-8984/10/22/007.
[16] J. B. Pendry, A. J. Holden, W. J. Stewart, and I. Youngs, “Extremely low-frequency plasmons in metallic
mesostructures,” Physical review letters, vol. 76, no. 25, p. 4773, 1996, doi: 10.1103/PhysRevLett.76.4773.
[17] A. Alu and N. Engheta, "Pairing an epsilon-negative slab with a mu-negative slab: resonance, tunneling and
transparency," in IEEE Transactions on Antennas and Propagation, vol. 51, no. 10, pp. 2558-2571, Oct. 2003, doi:
10.1109/TAP.2003.817553.
[18] D. R. Smith, D. C. Vier, T. Koschny, and C. M. Soukoulis, “Electromagnetic parameter retrieval from
inhomogeneous metamaterials,” Physical review E, vol. 71, no. 3, p. 36617, 2005, doi:
10.1103/PhysRevE.71.036617.
[19] A. K. Jassim, M. Jasim, A. F. Fahad, “Design selective band antenna using coupling sidewall and multi resonator
for wireless communications,” Bulletin of Electrical Engineering and Informatics, vol. 9, no. 5, pp. 2206-2212,
2020, doi: 10.11591/eei.v9i5.2247.
[20] J. Baker-Jarvis, E. J. Vanzura and W. A. Kissick, "Improved technique for determining complex permittivity with
the transmission/reflection method," in IEEE Transactions on Microwave Theory and Techniques, vol. 38, no. 8,
pp. 1096-1103, Aug. 1990, doi: 10.1109/22.57336.
[21] X. Chen, T. M. Grzegorczyk, B.-I. Wu, J. Pacheco Jr, and J. A. Kong, “Robust method to retrieve the constitutive
effective parameters of metamaterials,” Physical review E, vol. 70, no. 1, p. 16608, 2004, doi:
10.1103/PHYSREVE.70.016608.
[22] H. A. Majid, M. K. A. Rahim and T. Masri, "Left handed metamaterial design for microstrip antenna application,"
2008 IEEE International RF and Microwave Conference, 2008, pp. 218-221, doi: 10.1109/RFM.2008.4897426.
[23] G. Kiziltas and J. L. Volakis, “Miniature antenna designs on metamaterial substrates,” in 3rd European Workshop
on Conformal Antennas, (Invited Paper), Bonn, Germany, 2003.
[24] Y. Dong and T. Itoh, "Metamaterial-Based Antennas," in Proceedings of the IEEE, vol. 100, no. 7, pp. 2271-2285,
July 2012, doi: 10.1109/JPROC.2012.2187631.
7. Bulletin of Electr Eng & Inf ISSN: 2302-9285
Microstrip patch antenna with metamaterial using superstrate technique … (Rasha Mahdi Salih)
2061
[25] Ali Khalid Jassim and R. H. Thaher, “Design and analysis microstrip antenna with a reflector to enhancement gain
for wireless communication,” Bulletin of Electrical Engineering and Informatics, vol. 9, no. 2, pp. 652-660, 2020,
doi: 10.11591/eei.v9i2.1696.
[26] K. Aydin and E. Ozbay, “Left-handed metamaterial-based superlens for subwavelength imaging of electromagnetic
waves,” Applied Physics A, vol. 87, no. 2, pp. 137-141, 2007, doi: 10.1007/s00339-006-3817-4.
BIOGRAPHIES OF AUTHORS
Rasha Mahdi Salih: received the B.S. E. E. degrees in electrical engineering from
Mustansiriyh University, Baghdad, Iraq, in 2008. Her current research interest, in the areas of
microstrip antennas with metasurface for a master's degree. E-mail: asdfx7871@gmail.com
Asst. Prof. Dr. Ali Khalid Jassim: at Mustansiriyah University, college Engineering of
Electrical Engineering Department. Holds a Bachelor's degree in 1999 and a Master’s degree
in 2010 and a Ph.D. in 2019 in communications engineering. Works in the field of cellular
networks communications and antennas and has a many of research in international journals
and scientific conferences. E-mail: alijassim79@yahoo.com,
alijassim@uomustansiriyah.edu.iq