Z-shaped dipole and fractal Z-shaped dipole antennas made of wires are introduced. Theses antennas exhibit lower resonant frequencies and small space occupations. The performance characteristics of the proposed antennas are examined and compared with successive iterations for the same wire length. The radiation properties are considered including input impedance and VSWR as functions of frequency. Also the comparison between the third iteration of fractal Z-shaped dipole antenna and linear dipole antenna with the same wire length are presented.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
This document describes a modified Sierpinski fractal circular antenna designed for wireless automotive applications. The antenna structure is based on a complementary Sierpinski triangle surrounded by a circular patch. Simulation results show that the proposed antenna has good wideband characteristics and can effectively support WLAN applications at 2.4GHz. The antenna's performance at the 3rd and 5th iterations is analyzed and compared in terms of return loss, gain, directivity, radiation patterns and efficiency. The results indicate that increasing the number of iterations improves the antenna's return loss and gain while maintaining multiband capabilities.
CIRCULARLY POLARIZED APERTURE COUPLED MICROSTRIP SHORT BACKFIRE ANTENNA WITH ...IAEME Publication
A circularly polarized microstrip short back fire antenna (CPMSBA) with two ringcorrugated rim using aperture coupling feed method is proposed in this paper. Theantenna is designed to operate in KU-band. The simulation results verify the circular
polarization. The axial ratio bandwidth bwAR is 3.74%, gain is 10.43 dBi andradiation efficiency is 89.7%. The antenna has a compact structure and high electricaland mechanical characteristics.
Design of a Dual-Band Microstrip Patch Antenna for GPS,WiMAX and WLAN.IOSR Journals
The A multi band microstrip patch antenna has been designed for GPS,WiMAX and WLAN
applications. The proposed antenna is designed by using substrate of RT duroid having permittivity of about 2.2
and loss tangent of 1.The substrate is having thickness of 6mm at which a trapezoidal patch antenna with V slot
has been introduced in this paper. The designing results like S11 parameter return loss,VSWR and field pattern
is plotted successfully. The obtained result is having a two band resonance with S11 less then -10dB and VSWR
less than 2.
So a dual band trapezoidal microstrip patch antenna has been designed and all results are plotted.Simmulating
software used is IE3D.
This document provides an overview of defected ground structures (DGS) for microwave circuit applications. It discusses how DGS units are etched patterns in circuit ground planes that can alter transmission line properties like capacitance and inductance. Various DGS unit shapes are presented, including dumbbell, spiral, arrowhead, and interdigital designs. Periodic DGS involve cascading multiple DGS units and can further widen stopbands and reduce circuit size. The document outlines the basic concepts and transmission characteristics of DGS and surveys their applications in microwave components.
This document presents a new printed slot antenna design based on the first iteration of the Sierpinski gasket fractal geometry for dual band wireless communication applications. The antenna is fed by a microstrip transmission line and exhibits resonant behavior at 2.4 GHz and 5.2 GHz, making it suitable for dual band WLAN systems. Simulation results show the lower resonant band is determined by the slot size, while the feed length and position of a vertical stub affect the upper band matching and frequency. Parametric studies optimize the antenna for good impedance matching across both bands.
DESIGN AND DEVELOPMENT OF ITERATIVE SQUARE RING FRACTAL ANTENNA FOR DUAL BAND...jmicro
In this paper, iterative square ring fractal antenna is proposed, designed and developed for Wireless
application. The functional characteristics of the antenna such as return loss, VSWR, radiation pattern and
gain are evaluated. Compact size and multi-band compatibility are the major design requirements of
fractal antenna. The proposed antenna has the dimension of 20mm X 20mm and it supports dual band
which is designed in FR4 substrate. It resonates at 5.9 GHz and 8.8 GHz with the return loss of -33dB, -
16dB, respectively. Further, the performance of the antenna is analyzed by varying feed position, feed
width and substrate thickness. By the analysis, we concluded that the proposed antenna have better
performance at left feed position with 0.9mm of feed width at the substrate thickness of 3.2mm.
T- Shape Antenna Design for Microwave Band Applications IJEEE
The document summarizes the design and simulation of a T-shaped fractal microstrip patch antenna for microwave band applications. The antenna was designed using a fractal technique with a scaling factor of 1/3 at each iteration to achieve multiband operation. Simulation results showed resonances at 2.4 GHz, 6.8 GHz, 8 GHz, 10.8 GHz, 12.2 GHz and 15.4 GHz with bandwidths ranging from 230 MHz to 2 GHz. The antenna exhibited VSWR less than 2 and gain higher than other resonant frequencies at 2.4 GHz, 8 GHz and 15.4 GHz. The fractal antenna design achieved size reduction and multiband performance making it suitable for applications such as wireless communications.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
This document describes a modified Sierpinski fractal circular antenna designed for wireless automotive applications. The antenna structure is based on a complementary Sierpinski triangle surrounded by a circular patch. Simulation results show that the proposed antenna has good wideband characteristics and can effectively support WLAN applications at 2.4GHz. The antenna's performance at the 3rd and 5th iterations is analyzed and compared in terms of return loss, gain, directivity, radiation patterns and efficiency. The results indicate that increasing the number of iterations improves the antenna's return loss and gain while maintaining multiband capabilities.
CIRCULARLY POLARIZED APERTURE COUPLED MICROSTRIP SHORT BACKFIRE ANTENNA WITH ...IAEME Publication
A circularly polarized microstrip short back fire antenna (CPMSBA) with two ringcorrugated rim using aperture coupling feed method is proposed in this paper. Theantenna is designed to operate in KU-band. The simulation results verify the circular
polarization. The axial ratio bandwidth bwAR is 3.74%, gain is 10.43 dBi andradiation efficiency is 89.7%. The antenna has a compact structure and high electricaland mechanical characteristics.
Design of a Dual-Band Microstrip Patch Antenna for GPS,WiMAX and WLAN.IOSR Journals
The A multi band microstrip patch antenna has been designed for GPS,WiMAX and WLAN
applications. The proposed antenna is designed by using substrate of RT duroid having permittivity of about 2.2
and loss tangent of 1.The substrate is having thickness of 6mm at which a trapezoidal patch antenna with V slot
has been introduced in this paper. The designing results like S11 parameter return loss,VSWR and field pattern
is plotted successfully. The obtained result is having a two band resonance with S11 less then -10dB and VSWR
less than 2.
So a dual band trapezoidal microstrip patch antenna has been designed and all results are plotted.Simmulating
software used is IE3D.
This document provides an overview of defected ground structures (DGS) for microwave circuit applications. It discusses how DGS units are etched patterns in circuit ground planes that can alter transmission line properties like capacitance and inductance. Various DGS unit shapes are presented, including dumbbell, spiral, arrowhead, and interdigital designs. Periodic DGS involve cascading multiple DGS units and can further widen stopbands and reduce circuit size. The document outlines the basic concepts and transmission characteristics of DGS and surveys their applications in microwave components.
This document presents a new printed slot antenna design based on the first iteration of the Sierpinski gasket fractal geometry for dual band wireless communication applications. The antenna is fed by a microstrip transmission line and exhibits resonant behavior at 2.4 GHz and 5.2 GHz, making it suitable for dual band WLAN systems. Simulation results show the lower resonant band is determined by the slot size, while the feed length and position of a vertical stub affect the upper band matching and frequency. Parametric studies optimize the antenna for good impedance matching across both bands.
DESIGN AND DEVELOPMENT OF ITERATIVE SQUARE RING FRACTAL ANTENNA FOR DUAL BAND...jmicro
In this paper, iterative square ring fractal antenna is proposed, designed and developed for Wireless
application. The functional characteristics of the antenna such as return loss, VSWR, radiation pattern and
gain are evaluated. Compact size and multi-band compatibility are the major design requirements of
fractal antenna. The proposed antenna has the dimension of 20mm X 20mm and it supports dual band
which is designed in FR4 substrate. It resonates at 5.9 GHz and 8.8 GHz with the return loss of -33dB, -
16dB, respectively. Further, the performance of the antenna is analyzed by varying feed position, feed
width and substrate thickness. By the analysis, we concluded that the proposed antenna have better
performance at left feed position with 0.9mm of feed width at the substrate thickness of 3.2mm.
T- Shape Antenna Design for Microwave Band Applications IJEEE
The document summarizes the design and simulation of a T-shaped fractal microstrip patch antenna for microwave band applications. The antenna was designed using a fractal technique with a scaling factor of 1/3 at each iteration to achieve multiband operation. Simulation results showed resonances at 2.4 GHz, 6.8 GHz, 8 GHz, 10.8 GHz, 12.2 GHz and 15.4 GHz with bandwidths ranging from 230 MHz to 2 GHz. The antenna exhibited VSWR less than 2 and gain higher than other resonant frequencies at 2.4 GHz, 8 GHz and 15.4 GHz. The fractal antenna design achieved size reduction and multiband performance making it suitable for applications such as wireless communications.
Low-Cost Flat Metal-Plate Dipole Antenna for 2.4/5 GHz WLAN OperationSaou-Wen Su
A low-cost, one-piece, flat-plate dipole antenna for dual WLAN band operation is presented. The dipole antenna is rectangular in shape with the dimensions 10 mm × 37 mm and fed by 50-ohm mini-coaxial cable. By cutting two L-shaped slits in each radiating arm, two dipole arms are obtained, which form a larger dipole and a smaller dipole antennas for the 2.4 and 5 GHz band operation respectively. The dipole arms are further short-circuited, making it possible for the antenna to be fabricated by stamping a single, flat metal plate only. The impedance bandwidth for 2.4/5 GHz WLAN operation is with VSWR below 1.5 and good omnidirectional radiation patterns are also observed.
Printed Omnidirectional Access-Point Antenna for 2.4/5-GHz WLAN OperationSaou-Wen Su
A new design of the printed omnidirectional antenna for applications in 2.4/5-GHz dual-WLAN-band access points is proposed. The antenna consists of a conventional collinear antenna for 2.4 GHz operation and two U stubs for 5 GHz operation. The two U stubs are located near the points where the maximum currents at about 5.5 GHz occurring on the strips of the collinear antenna, and arranged back to back in the same phase for achieving better antenna gain. Detailed analyses of the U stub on the impedance matching over the 5 GH band is presented. A prototype with good omnidirectional radiation across the 2.4/5-GHz WLAN bands is demonstrated.
EFFECT OF DIFFERENT SYMMETRIC SLITS ON MICROSTRIP PATCH ANTENNAjmicro
In this paper, a basic linearly polarised microstrip square patch antenna operating at 2.4 GHz is
proposed. We have modified the basic microstrip square patch antenna with rectangular shape slits, V
shape slits and truncated corners to achieve circular polarization. Basically we have designed five
different antennas to meet the specification. The various antennas have been simulated, fabricated and the
performance has been tested on network analyser (Agilent Technologies: N9912A, SNMY51464189,
ROHDE & SCHWARZ: ZVL13, 9 KHz to 13.6GHz,). The simulated and tested performance shows close
agreement with each other. The various structures used in this study are microstrip square patch radiator,
microstrip square patch radiator with truncated corner, rectangular slits, truncated corner with
rectangular slits and V shape slits. The experiment results show rectangular slits with truncated corners in
the main square patch and rectangular slits in the main square patch provide better performance with
respect to the antenna parameters. Designed antenna is compact and provides circular polarization at the
required operating frequency of 2.4GHz with improved bandwidth and gain. The use of circularly
polarized antennas presents an attractive solution to achieve this polarization match which allows for
more flexibility in the angle between transmitting and receiving antennas. It gives the following
advantages such as reduction in the effect of multipath reflections, decrease in transmission losses,
enhancement of weather penetration and allowing any orientation to the communication system
Corner truncated inverted u slot triple band tunable rectangular microstrip...IAEME Publication
This document summarizes a research paper that presents the design and development of a triple band tunable microstrip antenna for wireless local area network applications. The antenna consists of a corner truncated rectangular patch with an inverted U-slot. Experimental results show that the antenna operates between 4.74-9.59 GHz across three bands. The secondary bands can be tuned to higher frequencies by varying the width of the inverted U-slot, without significantly affecting the primary band. Both simulated and experimental results show good agreement, with broadside radiation patterns. The proposed antenna design provides a low-cost solution for applications requiring operation across multiple frequency bands.
Artificial intelligence in the design of microstrip antennaRaj Kumar Thenua
This work presents a Neural Network model for the design of Microstrip Antenna for a desired frequency between 3.5 GHz to 5.5 GHz. The results obtained from the proposed method are compared with the results of IE3D and are found to be in good agreement. The advantage of the proposed method lies with the fact that the various parameters required for the design of specific Microstrip antenna at a particular frequency of interest can be easily extracted without going into the rigorous time consuming, iterative design procedures using a costly software package. In this work, a general design procedure is suggested for the Microstrip antennas using artificial neural networks and this is demonstrated using the rectangular patch geometry.
International Journal of Computational Engineering Research(IJCER)ijceronline
The document describes a wide band W-shaped microstrip patch antenna with an inverted U-slotted ground plane designed for wireless applications. A parametric study was performed by varying the feed location and return loss variations were observed. An impedance bandwidth of 24.5% was obtained. Simulation results for return loss, VSWR, radiation patterns, and gain satisfied theoretical conditions. The antenna design achieves wide bandwidth suitable for wireless applications like WLAN and Bluetooth.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
A dual-frequency microstrip patch antennas has been presented and used for 802.11WLAN
applications. The antennas had been designed, simulated and parametrically studied in CST Microwave
studio. By introducing u-slot, dual-band operation with its operating mode centered at frequency 2.4GHz,
3.65GHz and 5.2GHz had been obtained. The gain and directivity had been improved by adjusting the
parameters of the antennas. The gain of the proposed designs was 6.019dBi, 4.04dBi and 6.22dBi and
directivity was 6.02dBi, 4.05dBi and 6.22dBi at resonant frequencies 2.4GHz, 3.6GHz and 5.2GHz
respectively. The patch antennas had been proposed to be used in portable devices that require
miniaturized constituent parts.
Printed Coplanar Two-Antenna Element for 2.4/5 GHz WLAN Operation in a MIMO S...Saou-Wen Su
This document describes a printed coplanar two-antenna element designed for dual-band WLAN operation at 2.4 GHz and 5 GHz for use in a MIMO system. The element consists of a planar inverted-F antenna for the 5 GHz band and a monopole antenna for the 2.4 GHz band, both printed on the same substrate with a shared ground plane. Two separate feeds are used to excite the antennas without requiring an external switch. When two of these elements are arranged with a spacing of 10 mm, the resulting four-antenna MIMO system achieves good isolation between all antenna pairs across both operating bands.
Hybrid of Monopole and Dipole Antennas for Concurrent 2.4- and 5-GHz WLAN Acc...Saou-Wen Su
A novel hybrid of a 2.4-GHz monopole antenna and a 5-GHz dipole antenna is presented to provide concurrent 2.4 and 5 GHz band operation for access- point applications. The two antennas are arranged in a collinear structure and printed on a compact dielectric substrate with dimensions 12 mm × 60 mm. The monopole antenna has a meandered radiating strip and is short-circuited to a small ground plane through a shorting strip. The dipole antenna includes two sub-dipoles at the opposite side of a narrow ground plane and fed by a simple T-junction microstrip-line network. The two antennas are closely set with a distance of 1 mm only, yet good port isolation (S21) well below –20 dB can be obtained. With a low profile, the proposed design can easily fit into the casing of some standard access points and allow the 2.4 and 5 GHz band signals to be simultaneously received or transmitted with no external diplexer required. Good omnidirectional radiation has been observed too.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
This document presents a novel dual open stub and U-slot loaded square microstrip antenna design for quad-band operation between 4.37-9.40 GHz. The antenna consists of a square patch with two open stubs placed diagonally and a U-slot embedded in the center. Experimental results show the antenna resonates at four bands with impedance bandwidths between 1.7-9.25% and achieves a peak gain of 2.76 dB, which is 3.45 times higher than a conventional square microstrip antenna. The proposed antenna design is compact, uses low-cost materials, and may be suitable for wireless applications such as WLAN and systems operating in the X-band frequency range.
— The Sierpinski fractal antenna has been analyzed
parametrically, and observed how its characteristics changing
with the variation of its different parameters. The input return
loss and input impedance have log periodic behavior that
characterizes the sierpinski monopole antenna as fractal
geometry. The band spacing and impedance matching have been
improved by using different scale factor and feeding methods.
Sierpinski monopole antenna for WLAN bands (2.4GHz and
5GHz) has been designed and simulated using Ansoft Hfss.The
operating frequencies of the proposed designs match with
IEEE802.11b (2.45GHz) and IEEE802.11a (5.20 GHz and
5.775GHz) standards which would allow WLAN operation.
DESIGN OF TRIPLE-BAND CPW FED CIRCULAR FRACTAL ANTENNA IJCI JOURNAL
A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN (5.5GHz) applications.
Design of Tripl-Band CPW FED Circular Fractal Antenna ijcisjournal
A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground
plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel
modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric
variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground
plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a
dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal
antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital
Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN
(5.5GHz) applications.
Iisrt 3-design of rectangular patch antenna array using advanced design metho...IISRTJournals
This document describes the design of rectangular patch antenna arrays. It discusses designing a single patch element and determining its physical parameters. It then covers designing 1x2 and 2x2 array configurations using rectangular patches. The feed networks are designed using quarter-wave transformers to match impedances. Simulation results show the return loss and Smith charts with deep S11 values at the operating frequency of 2.4GHz, indicating good impedance matching.
Design of rectangular patch antenna array using advanced design methodologyIISRT
This document describes the design of rectangular patch antenna arrays. It discusses designing a single patch element, including selecting substrate properties and calculating patch dimensions. It then covers array design, including arranging elements with proper spacing and designing feed networks. Specifically, it presents the design of 1x2 and 2x2 rectangular patch antenna arrays. The key parameters discussed are return loss, VSWR, and impedance matching using techniques like quarter-wave transformers. Simulation results showing return loss and Smith charts are presented to validate the designed arrays operate as intended around 2.4GHz.
Design of rectangular patch antenna array using advanced design methodologyRamesh Patriotic
This document describes the design of rectangular patch antenna arrays. It discusses designing a single rectangular patch element, including selecting substrate properties and calculating patch dimensions. It then covers array design, including arranging elements with proper spacing and designing feed networks. Specifically, it presents the design of 1x2, 2x2, and 1x4 rectangular patch antenna arrays. Simulation results show the return loss and Smith charts for each array, indicating good impedance matching at the target frequency of 2.4GHz. Radiation patterns are also presented, demonstrating the increase in gain and directivity provided by antenna arrays.
The document describes the design and simulation of a novel star-shaped fractal slot antenna. The antenna was modified from a triangular microstrip antenna into a star-shaped patch with fractal geometry. This increased the antenna's impedance bandwidth. Simulation results showed the antenna achieved a wide bandwidth of 56.67% from 4.8 GHz to 7.1 GHz, covering WLAN and X-band applications. Within this band, the antenna maintained stable radiation patterns and a gain ranging from 6.33 dBi to 10.02 dBi. Introducing a fractal iteration further improved the bandwidth and gain.
Compact Rectangular Slot Microstrip Antenna with Band-Notched Characteristics...jmicro
n this paper, we present an offset microstrip-fed ultraw
ideband antenna with band notch
characteristics.The antenna structure consists of rectangular r
adiating patch and ground plane with
rectangular shaped slot, which increases impedance bandwidth upto 1
17.73%(2.9-11.2GHz).A new
modified U slot is etched in the radiating patch to create band-
notched properties in the WiMAX (3.3-
3.7GHz) and C-band satellite communication (3.7-4.15GHz).Further
more, parametric studies have been
conducted using EM simulation software CADFEKO suite(7.0) and
optimized with stable radiation pattern
which satisfied UWB requirement for VSWR<2.A prototype of ante
nna is fabricated on 1.6mm thick FR-4
substrate with dielectric constant of 4.4 and loss tangent of 0.02
.The designed antenna exhibits
bidirectional and omni directional radiation patterns along E and
H-plane with stable gain and efficiency
over entire operating band except notch frequency band. Simulated res
ults are in good agreement with the
measured results of the proposed antenna which makes it a good
candidate for UWB application.
Electro Dynamic and Plasmonic Features of Nano-Plasmonic Bow Tie Antenna
Citation: Manu Mitra (2018) Electro Dynamic and Plasmonic Features of Nano-Plasmonic Bow Tie Antenna. SF J Telecommunic 2:3.
This document describes a rectangular patch antenna with multiple rectangular slots for Wi-Max applications. A printed rectangular patch antenna was designed with four rectangular slots arranged in a mirrored pattern on the patch. Simulations showed the antenna achieved a return loss of -41.7dB at 3.498GHz with a 200MHz bandwidth, suitable for Wi-Max. Radiation patterns and gains between 3-4dB were obtained. The proposed antenna design demonstrates an effective way to increase bandwidth for Wi-Max applications using a simple rectangular patch with multiple rectangular slots.
Low-Cost Flat Metal-Plate Dipole Antenna for 2.4/5 GHz WLAN OperationSaou-Wen Su
A low-cost, one-piece, flat-plate dipole antenna for dual WLAN band operation is presented. The dipole antenna is rectangular in shape with the dimensions 10 mm × 37 mm and fed by 50-ohm mini-coaxial cable. By cutting two L-shaped slits in each radiating arm, two dipole arms are obtained, which form a larger dipole and a smaller dipole antennas for the 2.4 and 5 GHz band operation respectively. The dipole arms are further short-circuited, making it possible for the antenna to be fabricated by stamping a single, flat metal plate only. The impedance bandwidth for 2.4/5 GHz WLAN operation is with VSWR below 1.5 and good omnidirectional radiation patterns are also observed.
Printed Omnidirectional Access-Point Antenna for 2.4/5-GHz WLAN OperationSaou-Wen Su
A new design of the printed omnidirectional antenna for applications in 2.4/5-GHz dual-WLAN-band access points is proposed. The antenna consists of a conventional collinear antenna for 2.4 GHz operation and two U stubs for 5 GHz operation. The two U stubs are located near the points where the maximum currents at about 5.5 GHz occurring on the strips of the collinear antenna, and arranged back to back in the same phase for achieving better antenna gain. Detailed analyses of the U stub on the impedance matching over the 5 GH band is presented. A prototype with good omnidirectional radiation across the 2.4/5-GHz WLAN bands is demonstrated.
EFFECT OF DIFFERENT SYMMETRIC SLITS ON MICROSTRIP PATCH ANTENNAjmicro
In this paper, a basic linearly polarised microstrip square patch antenna operating at 2.4 GHz is
proposed. We have modified the basic microstrip square patch antenna with rectangular shape slits, V
shape slits and truncated corners to achieve circular polarization. Basically we have designed five
different antennas to meet the specification. The various antennas have been simulated, fabricated and the
performance has been tested on network analyser (Agilent Technologies: N9912A, SNMY51464189,
ROHDE & SCHWARZ: ZVL13, 9 KHz to 13.6GHz,). The simulated and tested performance shows close
agreement with each other. The various structures used in this study are microstrip square patch radiator,
microstrip square patch radiator with truncated corner, rectangular slits, truncated corner with
rectangular slits and V shape slits. The experiment results show rectangular slits with truncated corners in
the main square patch and rectangular slits in the main square patch provide better performance with
respect to the antenna parameters. Designed antenna is compact and provides circular polarization at the
required operating frequency of 2.4GHz with improved bandwidth and gain. The use of circularly
polarized antennas presents an attractive solution to achieve this polarization match which allows for
more flexibility in the angle between transmitting and receiving antennas. It gives the following
advantages such as reduction in the effect of multipath reflections, decrease in transmission losses,
enhancement of weather penetration and allowing any orientation to the communication system
Corner truncated inverted u slot triple band tunable rectangular microstrip...IAEME Publication
This document summarizes a research paper that presents the design and development of a triple band tunable microstrip antenna for wireless local area network applications. The antenna consists of a corner truncated rectangular patch with an inverted U-slot. Experimental results show that the antenna operates between 4.74-9.59 GHz across three bands. The secondary bands can be tuned to higher frequencies by varying the width of the inverted U-slot, without significantly affecting the primary band. Both simulated and experimental results show good agreement, with broadside radiation patterns. The proposed antenna design provides a low-cost solution for applications requiring operation across multiple frequency bands.
Artificial intelligence in the design of microstrip antennaRaj Kumar Thenua
This work presents a Neural Network model for the design of Microstrip Antenna for a desired frequency between 3.5 GHz to 5.5 GHz. The results obtained from the proposed method are compared with the results of IE3D and are found to be in good agreement. The advantage of the proposed method lies with the fact that the various parameters required for the design of specific Microstrip antenna at a particular frequency of interest can be easily extracted without going into the rigorous time consuming, iterative design procedures using a costly software package. In this work, a general design procedure is suggested for the Microstrip antennas using artificial neural networks and this is demonstrated using the rectangular patch geometry.
International Journal of Computational Engineering Research(IJCER)ijceronline
The document describes a wide band W-shaped microstrip patch antenna with an inverted U-slotted ground plane designed for wireless applications. A parametric study was performed by varying the feed location and return loss variations were observed. An impedance bandwidth of 24.5% was obtained. Simulation results for return loss, VSWR, radiation patterns, and gain satisfied theoretical conditions. The antenna design achieves wide bandwidth suitable for wireless applications like WLAN and Bluetooth.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
A dual-frequency microstrip patch antennas has been presented and used for 802.11WLAN
applications. The antennas had been designed, simulated and parametrically studied in CST Microwave
studio. By introducing u-slot, dual-band operation with its operating mode centered at frequency 2.4GHz,
3.65GHz and 5.2GHz had been obtained. The gain and directivity had been improved by adjusting the
parameters of the antennas. The gain of the proposed designs was 6.019dBi, 4.04dBi and 6.22dBi and
directivity was 6.02dBi, 4.05dBi and 6.22dBi at resonant frequencies 2.4GHz, 3.6GHz and 5.2GHz
respectively. The patch antennas had been proposed to be used in portable devices that require
miniaturized constituent parts.
Printed Coplanar Two-Antenna Element for 2.4/5 GHz WLAN Operation in a MIMO S...Saou-Wen Su
This document describes a printed coplanar two-antenna element designed for dual-band WLAN operation at 2.4 GHz and 5 GHz for use in a MIMO system. The element consists of a planar inverted-F antenna for the 5 GHz band and a monopole antenna for the 2.4 GHz band, both printed on the same substrate with a shared ground plane. Two separate feeds are used to excite the antennas without requiring an external switch. When two of these elements are arranged with a spacing of 10 mm, the resulting four-antenna MIMO system achieves good isolation between all antenna pairs across both operating bands.
Hybrid of Monopole and Dipole Antennas for Concurrent 2.4- and 5-GHz WLAN Acc...Saou-Wen Su
A novel hybrid of a 2.4-GHz monopole antenna and a 5-GHz dipole antenna is presented to provide concurrent 2.4 and 5 GHz band operation for access- point applications. The two antennas are arranged in a collinear structure and printed on a compact dielectric substrate with dimensions 12 mm × 60 mm. The monopole antenna has a meandered radiating strip and is short-circuited to a small ground plane through a shorting strip. The dipole antenna includes two sub-dipoles at the opposite side of a narrow ground plane and fed by a simple T-junction microstrip-line network. The two antennas are closely set with a distance of 1 mm only, yet good port isolation (S21) well below –20 dB can be obtained. With a low profile, the proposed design can easily fit into the casing of some standard access points and allow the 2.4 and 5 GHz band signals to be simultaneously received or transmitted with no external diplexer required. Good omnidirectional radiation has been observed too.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
This document presents a novel dual open stub and U-slot loaded square microstrip antenna design for quad-band operation between 4.37-9.40 GHz. The antenna consists of a square patch with two open stubs placed diagonally and a U-slot embedded in the center. Experimental results show the antenna resonates at four bands with impedance bandwidths between 1.7-9.25% and achieves a peak gain of 2.76 dB, which is 3.45 times higher than a conventional square microstrip antenna. The proposed antenna design is compact, uses low-cost materials, and may be suitable for wireless applications such as WLAN and systems operating in the X-band frequency range.
— The Sierpinski fractal antenna has been analyzed
parametrically, and observed how its characteristics changing
with the variation of its different parameters. The input return
loss and input impedance have log periodic behavior that
characterizes the sierpinski monopole antenna as fractal
geometry. The band spacing and impedance matching have been
improved by using different scale factor and feeding methods.
Sierpinski monopole antenna for WLAN bands (2.4GHz and
5GHz) has been designed and simulated using Ansoft Hfss.The
operating frequencies of the proposed designs match with
IEEE802.11b (2.45GHz) and IEEE802.11a (5.20 GHz and
5.775GHz) standards which would allow WLAN operation.
DESIGN OF TRIPLE-BAND CPW FED CIRCULAR FRACTAL ANTENNA IJCI JOURNAL
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A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground
plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel
modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric
variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground
plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a
dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal
antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital
Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN
(5.5GHz) applications.
Iisrt 3-design of rectangular patch antenna array using advanced design metho...IISRTJournals
This document describes the design of rectangular patch antenna arrays. It discusses designing a single patch element and determining its physical parameters. It then covers designing 1x2 and 2x2 array configurations using rectangular patches. The feed networks are designed using quarter-wave transformers to match impedances. Simulation results show the return loss and Smith charts with deep S11 values at the operating frequency of 2.4GHz, indicating good impedance matching.
Design of rectangular patch antenna array using advanced design methodologyIISRT
This document describes the design of rectangular patch antenna arrays. It discusses designing a single patch element, including selecting substrate properties and calculating patch dimensions. It then covers array design, including arranging elements with proper spacing and designing feed networks. Specifically, it presents the design of 1x2 and 2x2 rectangular patch antenna arrays. The key parameters discussed are return loss, VSWR, and impedance matching using techniques like quarter-wave transformers. Simulation results showing return loss and Smith charts are presented to validate the designed arrays operate as intended around 2.4GHz.
Design of rectangular patch antenna array using advanced design methodologyRamesh Patriotic
This document describes the design of rectangular patch antenna arrays. It discusses designing a single rectangular patch element, including selecting substrate properties and calculating patch dimensions. It then covers array design, including arranging elements with proper spacing and designing feed networks. Specifically, it presents the design of 1x2, 2x2, and 1x4 rectangular patch antenna arrays. Simulation results show the return loss and Smith charts for each array, indicating good impedance matching at the target frequency of 2.4GHz. Radiation patterns are also presented, demonstrating the increase in gain and directivity provided by antenna arrays.
The document describes the design and simulation of a novel star-shaped fractal slot antenna. The antenna was modified from a triangular microstrip antenna into a star-shaped patch with fractal geometry. This increased the antenna's impedance bandwidth. Simulation results showed the antenna achieved a wide bandwidth of 56.67% from 4.8 GHz to 7.1 GHz, covering WLAN and X-band applications. Within this band, the antenna maintained stable radiation patterns and a gain ranging from 6.33 dBi to 10.02 dBi. Introducing a fractal iteration further improved the bandwidth and gain.
Compact Rectangular Slot Microstrip Antenna with Band-Notched Characteristics...jmicro
n this paper, we present an offset microstrip-fed ultraw
ideband antenna with band notch
characteristics.The antenna structure consists of rectangular r
adiating patch and ground plane with
rectangular shaped slot, which increases impedance bandwidth upto 1
17.73%(2.9-11.2GHz).A new
modified U slot is etched in the radiating patch to create band-
notched properties in the WiMAX (3.3-
3.7GHz) and C-band satellite communication (3.7-4.15GHz).Further
more, parametric studies have been
conducted using EM simulation software CADFEKO suite(7.0) and
optimized with stable radiation pattern
which satisfied UWB requirement for VSWR<2.A prototype of ante
nna is fabricated on 1.6mm thick FR-4
substrate with dielectric constant of 4.4 and loss tangent of 0.02
.The designed antenna exhibits
bidirectional and omni directional radiation patterns along E and
H-plane with stable gain and efficiency
over entire operating band except notch frequency band. Simulated res
ults are in good agreement with the
measured results of the proposed antenna which makes it a good
candidate for UWB application.
Electro Dynamic and Plasmonic Features of Nano-Plasmonic Bow Tie Antenna
Citation: Manu Mitra (2018) Electro Dynamic and Plasmonic Features of Nano-Plasmonic Bow Tie Antenna. SF J Telecommunic 2:3.
This document describes a rectangular patch antenna with multiple rectangular slots for Wi-Max applications. A printed rectangular patch antenna was designed with four rectangular slots arranged in a mirrored pattern on the patch. Simulations showed the antenna achieved a return loss of -41.7dB at 3.498GHz with a 200MHz bandwidth, suitable for Wi-Max. Radiation patterns and gains between 3-4dB were obtained. The proposed antenna design demonstrates an effective way to increase bandwidth for Wi-Max applications using a simple rectangular patch with multiple rectangular slots.
“Designed and Simulation Modified H Shaped” Microstrip Patch AntennaIOSR Journals
This paper describes a new microstrip patch antenna which is presented by using a IE3D software
.These antenna is named as “Designed and simulation of modified H shaped microstrip patch antenna”. A
simulation result has been obtained which states that the microstrip patch antenna possess predictable multi
band characteristics. The result shows that the designed antenna can operated in three different frequency
bands with bandwidth of 2.68%, 10.23%, 5.60%.the resonating behavior makes this antenna suitable for
different type of applications.
“Designed and Simulation Modified H Shaped” Microstrip Patch AntennaIOSR Journals
Abstract : This paper describes a new microstrip patch antenna which is presented by using a IE3D software .These antenna is named as “Designed and simulation of modified H shaped microstrip patch antenna”. A simulation result has been obtained which states that the microstrip patch antenna possess predictable multi band characteristics. The result shows that the designed antenna can operated in three different frequency bands with bandwidth of 2.68%, 10.23%, 5.60%.the resonating behavior makes this antenna suitable for different type of applications. Keywords: Patch Antenna, Microstrip antenna, Multiband, narrowband, Radome
Compact Rectangular Slot Microstrip Antenna with Band-Notched Characteristics...jmicro
In this paper, we present an offset microstrip-fed ultrawideband antenna with band notch
characteristics.The antenna structure consists of rectangular radiating patch and ground plane with
rectangular shaped slot, which increases impedance bandwidth upto 117.73%(2.9-11.2GHz).A new
modified U slot is etched in the radiating patch to create band-notched properties in the WiMAX (3.3-
3.7GHz) and C-band satellite communication (3.7-4.15GHz).Furthermore, parametric studies have been
conducted using EM simulation software CADFEKO suite(7.0) and optimized with stable radiation pattern
which satisfied UWB requirement for VSWR<2.A prototype of antenna is fabricated on 1.6mm thick FR-4
substrate with dielectric constant of 4.4 and loss tangent of 0.02.The designed antenna exhibits
bidirectional and omni directional radiation patterns along E and H-plane with stable gain and efficiency
over entire operating band except notch frequency band. Simulated results are in good agreement with the
measured results of the proposed antenna which makes it a good candidate for UWB application.
Bandwidth efficient stacked arrangement of square patchesIAEME Publication
1) The document describes a stacked arrangement of two square patch antennas separated by a 0.5mm air gap to improve bandwidth.
2) Simulation results show the stacked design operates at two resonant frequencies (5.24GHz and 6.016GHz) with a bandwidth of 32.54%, compared to 3.73% for a single square patch.
3) Radiation patterns are similar between the designs, but the stacked patch configuration enhances bandwidth nearly 9 times over a single square patch antenna.
Design of a Dual-Band Microstrip Patch Antenna for GPS,WiMAX and WLANIOSR Journals
Abstract : The A multi band microstrip patch antenna has been designed for GPS,WiMAX and WLAN applications. The proposed antenna is designed by using substrate of RT duroid having permittivity of about 2.2 and loss tangent of 1.The substrate is having thickness of 6mm at which a trapezoidal patch antenna with V slot has been introduced in this paper. The designing results like S11 parameter return loss,VSWR and field pattern is plotted successfully. The obtained result is having a two band resonance with S11 less then -10dB and VSWR less than 2. So a dual band trapezoidal microstrip patch antenna has been designed and all results are plotted.Simmulating software used is IE3D. Keywords - V-shape slot, RT duroid, Dual band, WLAN, WiMAX,
This document describes the design and testing of a dual-polarized slot array patch antenna for WiMAX applications operating at 5.8 GHz. The antenna consists of an 8x8 array of circular patch elements, with each element excited using an aperture coupled microstrip feed. The design was optimized using simulation software to achieve high gain (26 dBi), wide bandwidth (14%), high port isolation, and good radiation patterns. Both simulated and measured results showed good agreement. The antenna meets specifications for WiMAX applications in the 5.15-5.9 GHz band and was found to be low-cost and easy to fabricate.
DESIGN AND SIMULATION OF MULTIBAND CHAUCER FRACTAL PATCH ANTENNA LOADED WITH ...IAEME Publication
This document describes the design and simulation of a multiband Chaucer fractal patch antenna loaded with a dumbbell structure. The antenna is designed on an FR4 substrate with a relative permittivity of 4.4 and thickness of 1.6 mm. The first iteration of the Chaucer fractal patch resonates at 2.4 GHz. Subsequent iterations and the addition of a dumbbell structure results in multiband behavior with resonances between 5-7 GHz. Simulation results show the antenna achieves fair return loss, gain, bandwidth and directivity at resonant frequencies.
Dual band microstrip antenna with slit load design for wireless local area ne...BASIM AL-SHAMMARI
This paper presents a design of dual frequency band operation nearly square patch antenna
for IEEE 802.11b,g (2.4Ghz-2.4835GHz) and IEEE 802.11a (5.15GHz-5.25GHz)by using a patch
antenna. The patch and ground plane are separated by a substrate; the radiating patch have two pairs
of orthogonal slits cut from the edge, this antenna has wide bandwidth in the frequency band of
(WLAN) and with a return loss ≤ −10 dB from 2.4 GHz to 2.48 GHz and from 5.12 GHz to 5.32
GHz exhibits circularly polarized far-field radiation pattern. The proposed antennas have been
simulated and analyzed using method of moments (MoM) based software package Microwave
Office 2009 v9.0. The results show that the antenna has dual-band frequency operation by using slit
load.
Dual band microstrip antenna with slit load design for wireless local area ne...BASIM AL-SHAMMARI
This paper presents a design of dual frequency band operation nearly square patch antenna
for IEEE 802.11b,g (2.4Ghz-2.4835GHz) and IEEE 802.11a (5.15GHz-5.25GHz)by using a patch
antenna. The patch and ground plane are separated by a substrate; the radiating patch have two pairs
of orthogonal slits cut from the edge, this antenna has wide bandwidth in the frequency band of
(WLAN) and with a return loss ≤ −10 dB from 2.4 GHz to 2.48 GHz and from 5.12 GHz to 5.32
GHz exhibits circularly polarized far field radiation pattern. The proposed antennas have been
simulated and analyzed using method of moments (MoM) based software package Microwave
Office 2009 v9.0. The results show that the antenna has dual band frequency operation by using slit
load.
This document presents the design and optimization of a planar ultra-wideband antenna with multiple band-notch characteristics. The antenna is designed to introduce single, dual, triple, and four independent notches across the FCC UWB frequency band of 3.1-10.6 GHz. Required notch frequencies are obtained by using T-shaped slots and inverted L-shaped metallic filter elements on the patch and ground plane. The optimized antenna design achieves notches at 3.5 GHz, 4.4 GHz, 7 GHz, and 7.7 GHz with overall dimensions of 22mm×23mm×1.6mm. Experimental results show good agreement with simulations.
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Z-SHAPED DIPOLE ANTENNA AND ITS FRACTAL ITERATIONS
1. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
DOI : 10.5121/ijnsa.2013.5512 139
Z-SHAPED DIPOLE ANTENNA AND
ITS FRACTAL ITERATIONS
Mustafa H. Abu Nasr
Engineering Department, Faculty of Engineering and Information Technology, Al- Azhar
University, Gaza, Palestine.
ABSTRACT
Z-shaped dipole and fractal Z-shaped dipole antennas made of wires are introduced. Theses antennas
exhibit lower resonant frequencies and small space occupations. The performance characteristics of the
proposed antennas are examined and compared with successive iterations for the same wire length. The
radiation properties are considered including input impedance and VSWR as functions of frequency. Also
the comparison between the third iteration of fractal Z-shaped dipole antenna and linear dipole antenna
with the same wire length are presented.
KEYWORDS
Wire antennas, fractal, MoM, input impedance, resonant, gain, VSWR, current distribution, polarization
1. INTRODUCTION
Wire-type antennas are made of conducting wires and are generally easy to construct, thus the
cost is normally low. Examples include dipoles, monopoles, loops, helices, Yagi–Uda and log-
periodic antennas. Arrays of dipoles-the famous form of the wire antennas- are commonly used
as base-station antennas in mobile systems [1, 2].
Fractal is a word that describes the complex geometries that are created through successive
iterations when applying a geometric generator to a simple Euclidean basis or iteration geometry.
In general, there are no strict guidelines as to what geometric shapes constitute fractal geometry.
However, there are geometric properties used to describe fractals such as self-similarity, in which
a small region of the geometry repeats the whole geometry and space-filling [3]. Mathematically,
the fractal geometry is principally defined by the characteristic of fractal-dimensions. The fractal-
dimension can be interpreted as measure of the space-filling properties and complexity of the
fractal shape [4]. Fractals provide a new approach to antenna design. The geometrical properties
of fractals challenge the traditional constraints of classical antennas. Fractals can be used in two
ways to enhance antenna designs. The first method is in the design of miniaturized antenna
elements. This can lead to antenna elements which are more discrete for the end user. The second
method is to use the self-similarity in the geometry to design antennas which are multiband. This
would allow the operator to incorporate several aspects of their system into one antenna. Antenna
elements utilizing both these tactics can be incorporated into highly advanced array and smart
antenna designs [4-9].
To obtain completely accurate solutions for wire antennas, the current on the wire must be solved
for, subject to the boundary condition that the tangential electric field is zero along the wire. This
approach gives rise to an integral equation which can be solved by numerical methods [1].
2. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
140
The method of moments (MoM) solution is a numerical procedure for solving the electric field
integral equation. Basis functions are chosen to represent the unknown currents (i.e., triangular
basis functions). Testing functions are chosen to enforce the integral equation on the surface of
the wires. With the choice of basis and testing functions, a matrix approximating the integral
equation is derived. If this matrix is inverted and multiplied by the local sources of electric field,
the complex magnitudes of the current basis functions are derived. All antenna performance
parameters can be determined from the derived current distribution. In this paper commercial
software (NEC-win professional) is used to obtain all the radiation characteristics of the proposed
S-shaped antennas. [1,10]
2. Z-SHAPED DIPOLE ANTENNA (ZDA) AND FRACTAL Z-SHAPED DIPOLE
ANTENNA
2.1 Antenna Structure
This antenna is made of a Z-shaped thin wire and is fed symmetrically as shown in Figure 1. The
antenna is located in the xz–plane. The fractal first, second and third iterations of Z-shaped dipole
antenna are depicted in figures 2, 3 and 4. Each iteration is formed by replacing the half of the
free arm of Z-shape by another Z-shape. All of these antennas have the same wire length (202
cm) and a radius of 0.1 cm. The MoM with one-volt delta gap source is applied to theses
antennas. The previous antennas occupy different spaces as shown in the figures and table 1. The
antenna performance properties are obtained using commercial software (NEC-WIN Pro V.1.6)
[11].
Figure1.a .Z-shaped dipole antenna Figure 1.b. Inverted Z-shaped antenna
Figure 2a. 1st
iteration of fractal ZDA Figure2b.1st
iteration of fractal inverted ZDA
3. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
141
Figure 3a. 2nd
iteration of fractal ZDA Figure 3b: 2nd
iteration of fractal inverted ZDA
Figure 4a. 3rd
iteration of fractal ZDA Figure 4b. 3rd
iteration of fractal ZDA
Table 1. Space dimensions for ZDA and fractal ZDA
Antenna type Space dimension
Z-shaped dipole antenna 60 cm x60cm
1st
iteration fractal Z-shaped dipole antenna 56 cm x56cm
2nd
iteration fractal Z-shaped dipole antenna 50 cm x43cm
3rd
iteration fractal Z-shaped dipole antenna 51 cm x40cm
2.2 Results and Discussions
2.2.1 The Input Impedance and The Resonant Performance
The input impedance as a function of frequency for ZDA and the successive fractal iterations of
ZDA are presented in figures 5 and 6.
4. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
142
Figure 5. The input resistances of ZDA and the successive fractal iterations of ZDA
Figure 6. The input reactance of ZDA and the successive fractal iterations of ZDA
From these figures (5 and 6) it is clear that the input resistance for the higher fractal iteration of
ZDA more stable than ZDA especially for high frequencies. The fractal ZDA loses its resonant
properties when the successive iteration increased and the antenna becomes a wideband antenna.
For this property, these types of antennas can be used in many applications such as GSM bands,
Bluetooth, Wi-Fi and other RF applications. Also the increased of successive iteration values
forced the antenna reactance to become capacitive.
The resonance performance characteristics of the first, second and third iterations of fractal ZDA
are presented in tables 2, 3 and 4. The second and third iterations, both have 7 resonant
frequencies in the band f < 3000 MHz and the first iteration has 8 resonant frequencies at the
same band.
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
5. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
143
Table 2. The resonance performance characteristics of the third iteration of fractal ZDA
Third iteration
Resonant Frequency
(MHz)
Resonant
Resistances(Ω)
VSWR
at Z o = 300 Ω
100 9 30
267 400 7.5
411 105 2.8
872 182 1.6
1138 355 1.2
1313 280 1.1
2397 300 1
Table 3. The resonance performance characteristics of the second iteration of fractal ZDA
Second iteration
Resonant Frequency
(MHz)
Resonant
Resistances(Ω)
VSWR
at Z o = 300 Ω
97 18 32
258 60 6.4
400 195 1.5
1011 274 1.1
1172 235 1.3
2120 330 1.1
Table 4. The resonance performance characteristics of the first iteration of fractal ZDA
First iteration
Resonant Frequency
(MHz)
Resonant
Resistances(Ω)
VSWR
at Z o = 300 Ω
88 13 30
241 73 4.3
398 650 2.2
828 380 1.3
971 320 1.1
1150 427 1.4
1717 323 1.1
2444 330 1.1
2.2.2 The Voltage Standing Wave Ratio VSWR
The VSWR at Z o =300 for the ZDA and fractal ZDA is shown in Figure 7.
6. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
144
Figure 7. The VSWR of ZDA and the successive fractal iterations of ZDA at Z o =300
2.2.3 The Radiation Pattern and the Gain
Typical power radiation patterns at 400 MHz , 900MGHz and 1900MHz for ZDA and the
successive fractal iterations of ZDA in the free space are given in Figures 8to 13.
Figure 8. Power radiation pattern in xz-
plane at 400 MHz
Figure 9. Power radiation pattern in xy-
plane at 400 MHz
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
7. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
145
Figure10. Power radiation pattern in
xz-plane at 900 MHz
Figure11. Power radiation pattern in
xy- plane at 900 MHz
Figure 12. Power radiation pattern in
xz-plane at 1900 MHz
Figure 13. Power radiation pattern in
xy-plane at 1900 MHz
The gain of theses antennas at the previous frequencies are presented in table 4
Table 4. The total gain in dB for ZDA and the successive fractal iterations of ZDA at different Frequencies
Antenna type 400MHz 900 MHz 1900 MHz
Z-shaped dipole antenna 4.4 4.1 10
1st
iteration fractal Z-shaped dipole antenna 3 7.5 2.2
2nd
iteration fractal Z-shaped dipole antenna 5.1 4.9 5.5
3rd
iteration fractal Z-shaped dipole antenna 4.8 4.53 3.9
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
8. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
146
2.2.4 The Current Distribution
The current distribution at 400 MHz , 900MHz and 1900MHz for ZDA and the successive fractal
iterations of ZDA are given in Figures 14 to 16. It is clear that the current distribution on the
second iteration more efficient than the others at 400MHz and 1900MHz where the third iteration
is the best at 900 MHz.
Figure 14. The current distribution for the ZDA and the successive fractal iterations of ZDA at the 400
MHz
Figure 15. The current distribution for the ZDA and the successive fractal iterations of ZDA at the 900
MHz
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
9. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
147
Figure 16. The current distribution for the ZDA and the successive fractal iterations of ZDA at the 1900
MHz
2.2.5 Polarization and Axial Ratio
The axial ratio (AR) of the ZDA and successive fractal iterations of ZDA is depicted in figure 17.
from this figure and the simulation results, it is clear that the ZDA and fractal ZDA radiate left
elliptically polarized (LEP) waves where the inverted ZDA and fractal inverted ZDA radiate
right elliptically polarized (REP) waves.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Axial
Ratio
(AR)
Frequency (MHz)
Figure 17. The axial ratio for the ZDA and the successive fractal iterations of ZDA
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
3rd
iteration ZDA
2nd
iteration ZDA
1st
iteration ZDA
Z-shaped DA
10. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
148
3. COMPARISON BETWEEN THE THIRD ITERATION OF Z-SHAPED DIPOLE
ANTENNA AND LINEAR DIPOLE
Figures 18, 19 and 20 present the input resistance, input reactance and VSWR for the third
iteration of fractal ZDA and linear dipole with the same wire length. Also the radiation patterns
and current distribution are represented in figures 21 to 26.
Figure 18. The input resistances of the third iteration of fractal ZDA and linear dipole with the same wire
length
Figure 19. The input reactance of the third iteration of fractal ZDA and linear dipole with the same wire
length
3rd
iteration ZDA
Linear dipole
3rd
iteration ZDA
Linear dipole
11. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
149
Figure 20. The VSWR of the third iteration of fractal ZDA and linear dipole with the same wire length at
Z o =300
Figure 21. Power radiation pattern in
xz-plane at 400 MHz
Figure 22. Power radiation pattern in
xy- plane at 400 MHz
Figure 23. Power radiation pattern in
xz-plane at 900 MHz
Figure 24. Power radiation pattern in
xy- plane at 900 MHz
3rd
iteration ZDA
Linear dipole
3rd
iteration ZDA
Linear dipole
3rd
iteration ZDA
Linear dipole
12. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
150
Figure 25. The current distribution of the third iteration of fractal ZDA and linear dipole with the same wire
length at the 400 MHz
Figure 26. The current distribution of the third iteration of fractal ZDA and linear dipole with the same wire
length at the 900 MHz
From the previous figures we notice that the fractal ZDA has superior performance over the linear
dipole. The linear dipole is resonant antenna but fractal ZDAs show broad characteristics. The
fractal ZDA has superior current distribution at the linear dipole. The main difference between
these two antennas is the polarization where the linear dipole is linearly polarized antenna [1,2]
but fractal Z-shaped dipole antenna is elliptically polarized antenna.
4. CONCLUSIONS
A new simple wire antenna is proposed and analyzed, namely the Z-shaped dipole antenna and
fractal Z-shaped dipole which radiates left elliptically polarized (LEP) waves. Also the
comparison between the third iteration Z-shaped dipole antennas and the linear dipole is
presented. The analysis of the antenna is performed using the MoM. The field patterns and gains
in the principal planes are obtained. Also the other radiation characteristics such as input
3rd iteration ZDA
Linear dipole
3rd
iteration ZDA
Linear dipole
13. International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.5, September 2013
151
resistance, reactance and the VSWR as functions of frequency are reported. The results show that
the proposed antennas are very promising to be used in the VHF and UHF frequency ranges.
REFERENCES
[1] C.A. Balanis, (2005)“Antenna Theory Analysis and Design” third edition (John Wiley & Sons).
[2] Yi Huang and Kevin Boyle, (2008) "Antennas from Theory to Practice" first edition (John Wiley &
Sons).
[3] Benoit B. Mandelbrot, (1977) "The Fractals Nature of Geometry", New York, W. H. Freeman and
Company.
[4] Douglas H. Werner and Raj Mittr, (2000) "Fontiers in Electromagnetis" New York, IEEE Press.
[5] Rajeev Mathur, Sunil Joshiand Krishna C Roy, (2010) “A Novel Multiband Koch Loop Antenna
Using Fractal Geometry For Wireless Communication System” International Journal of Wireless &
Mobile Networks (IJWMN) Vol. 3, No. 5.
[6] Li, D. and J.-F. Mao, (2012)"Koch-like sided Sierpinski gasket multifractal dipole antenna," Progress
In Electromagnetics Research , Vol. 126, 399-427.
[7] LIi Daotie and Mao Junfa , (2013 )“ Multiband Multimode Arched Bow-Shaped Fractal Helix
Antenna” Progress In Electromagnetics Research, Vol. 141.
[8] John P. Gianvittorio and Yahya Rabmat-Samii, (2002 )“Fractal Antennas: A novel Antenna
Miniaturization Technique, and Applications,” IEEE Antennas and Propagation Magazine, pp. 20-36.
[9] John Gianvittorio, (2003 )“Fractals, MEMS, and FSS Electromagnetic Device: Miniaturization and
Multiple Resonances,” PhD dissertation, University of California, Los Angeles.
[10] The NEC-2 Manual from (http://www.traveller.com/~richesop/nec/).