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Miniaturized Microstrip Patch Antenna Array at 3.8 GHz for WiMax Applicationiosrjce
The aim of this work is to miniaturize microstrip patch antenna array resonating at 3.8 GHz
suitable for WiMax application using defected ground structure (DGS).The DGS has been employed to shift the
resonance frequency of an initial microstrip antenna array from 5.2 GHz to 3.8 GHz by disturbing the
antenna’s current distribution. The proposed DGS is integrated in the ground plane under the patch antenna
array for size reduction. Finally, the miniaturization up to 45% with respect to the conventional microstrip
antenna is successfully accomplished. A prototype of the antenna was fabricated with the RT-Duriod substrate.
This technique has been validated experimentally and measured results were found to be in good agreement
with simulated results.
PERFORMANCE ANALYSIS OF 2D-EBG UNDER MONOPOLE ANTENNAjantjournal
The artificial properties in two dimensional electromagnetic structures (2D-EBGs), such as PMC and Band Reject Region are investigated for a proposed structure of square shaped mushroom. The radiation characteristics of monopole antenna over this 2D-EBG is tested by considering two cases. During first case monopole antenna is made to operate within band rejection region. Second case monopole antenna made operate outside the band rejection range. The obtained results during first case is showing enhancement in operating band width and smoother radiation pattern. In second case the effect is null and
2D-EBG resembles like conventional plane reflector. The simulated results are presented.
Design of Reconfigurable Microstrip Patch Antenna for WLAN ApplicationEditor IJMTER
In this paper we propose a rectangular microstrip patch antenna with inset fed which can
operate at 2.4 GHz (IEEE 802.11b) & 5.8 GHz (IEEE 802.11a) WLAN applications. Various slot is
cut into the antenna structure which changes the surface current path resulting in dual resonant
frequency. Further by embedding any switch into a slot, reconfiguration can be achieved i.e. the
antenna can only be used in unlicensed 2.4 GHz band. The achieved directivity is greater than 5db and
the bandwidth obtained is much greater than the required bandwidth. The proposed antenna is
simulated using High Frequency Structure Simulator.
Miniaturized Microstrip Patch Antenna Array at 3.8 GHz for WiMax Applicationiosrjce
The aim of this work is to miniaturize microstrip patch antenna array resonating at 3.8 GHz
suitable for WiMax application using defected ground structure (DGS).The DGS has been employed to shift the
resonance frequency of an initial microstrip antenna array from 5.2 GHz to 3.8 GHz by disturbing the
antenna’s current distribution. The proposed DGS is integrated in the ground plane under the patch antenna
array for size reduction. Finally, the miniaturization up to 45% with respect to the conventional microstrip
antenna is successfully accomplished. A prototype of the antenna was fabricated with the RT-Duriod substrate.
This technique has been validated experimentally and measured results were found to be in good agreement
with simulated results.
PERFORMANCE ANALYSIS OF 2D-EBG UNDER MONOPOLE ANTENNAjantjournal
The artificial properties in two dimensional electromagnetic structures (2D-EBGs), such as PMC and Band Reject Region are investigated for a proposed structure of square shaped mushroom. The radiation characteristics of monopole antenna over this 2D-EBG is tested by considering two cases. During first case monopole antenna is made to operate within band rejection region. Second case monopole antenna made operate outside the band rejection range. The obtained results during first case is showing enhancement in operating band width and smoother radiation pattern. In second case the effect is null and
2D-EBG resembles like conventional plane reflector. The simulated results are presented.
Design of Reconfigurable Microstrip Patch Antenna for WLAN ApplicationEditor IJMTER
In this paper we propose a rectangular microstrip patch antenna with inset fed which can
operate at 2.4 GHz (IEEE 802.11b) & 5.8 GHz (IEEE 802.11a) WLAN applications. Various slot is
cut into the antenna structure which changes the surface current path resulting in dual resonant
frequency. Further by embedding any switch into a slot, reconfiguration can be achieved i.e. the
antenna can only be used in unlicensed 2.4 GHz band. The achieved directivity is greater than 5db and
the bandwidth obtained is much greater than the required bandwidth. The proposed antenna is
simulated using High Frequency Structure Simulator.
Design of Square Miniaturized L Band Fractal AntennaEditor IJMTER
This paper introduces a new square patch miniaturized antenna operating in L band. The
design and analysis of the antenna is executed using IE3D electromagnetic simulation software using
substrate parameter of glass epoxy FR-4 substrate. In this paper, a Square patch of 10X10 mm2 is
investigated. In further improvements, parts of the patch are removed in two iterations to obtain a
miniaturized antenna. The proposed fractal antenna has a great potential of application and gives a
stable radiation performance in the frequency range of 1.333 GHz to 2 GHz.
Analysis of Metamaterial Based Microstrip Array Antennaijceronline
Metamaterials have been intensively researched due to their peculiar features such as negative permittivity and/or permeability and ultra-refraction phenomenon. To satisfy the demand of commonly used wireless communication systems, an antenna which can operate at higher frequencies and enhanced characteristics are desirable. The arrangement of all elements is done that they provide an improvement in bandwidth, directivity return loss etc. The frequency response of a metamaterial can be tailored by varying its characteristics. A new metamaterial structure using square and ring split ring resonator is proposed. Using this metamaterial structure, a microstrip patch antenna is designed with enhanced characteristics such as reduction in return lossfrom-20dB to -36dB with tunability is achieved.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Multiband Circular Microstrip Patch Antenna for WLAN Applicationtheijes
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.
This paper presents the Microstrip patch antenna for WLAN applications with planar geometry and it consists of a defected ground (DGS), a feed, a substrate, and a patch. The design with DGS has been analyzed taking different dimensions of H Slot and achieve optimized dimensions with the help of CST, Microwave Studio commercial software for WLAN band at 5.20 GHz frequency with corresponding bandwidth of 310 MHz to optimize antenna’s properties. Results show that the final designed antenna has favorable characteristics at this frequency.
Electrically Controlled Frequency Reconfigurable Comb Type Antenna for Wirele...IDES Editor
Electrically controlled frequency reconfigurable
comb type antenna is presented in this paper. Reconfigurability
is achieved by placing a PIN diode in each slot of the comb
type antenna. The proposed antenna has very compact size
and works on 8 different bands depending upon the state and
number of PIN diode (ON/OFF). Ansoft Designer 7 is used to
simulate the equivalent model for the PIN diode and proposed
antenna is fabricated on FR4 substrate using photolithography
process. As the antenna reconfigure its resonating frequency
from 1st band to 8th band, directivity increases from 3.28 to 4.02
and radiation efficiency increases from 75.3% to 93.45% due
to the improvement in impedance matching at higher band.
Reconfigurable Microstrip Patch Antenna for Frequency Diversity Using RF MEMSIOSR Journals
A novel reconfigurable patch antenna for frequency diversity is proposed by reconfiguring its
geometry using tree rectangular tapes that are connected to the patch via six RF MEMS switches. So switching
between the different frequency bands is achieved by using capacitive series RF-MEMS switches. The antenna
was designed to operate at 2.6 GHz, 3.1 GHz, 3.5 GHz and 5 GHz
Bandwidth enhancement of rectangular microstrip patch antenna using slotsIOSR Journals
In this paper, a new design of rectangular microstrip patch antenna (RMPA) without slot, with slots
and array is proposed and analyzed. The designed antenna has been simulated using HFSS software. The
simulated results for return loss, radiation pattern and gain are presented and discussed. The bandwidth of
proposed antenna is 2.4GHz-5.9GHz for VSWR(voltage standing wave ratio)<2><-
10dB return loss as an acceptable reference in wireless applications which cover worldwide interoperability for
microwave access (WiMAX) and wireless local area network (WLAN) and other applications. Gain of 10dB is
achieved for antenna array.
Design of Square Miniaturized L Band Fractal AntennaEditor IJMTER
This paper introduces a new square patch miniaturized antenna operating in L band. The
design and analysis of the antenna is executed using IE3D electromagnetic simulation software using
substrate parameter of glass epoxy FR-4 substrate. In this paper, a Square patch of 10X10 mm2 is
investigated. In further improvements, parts of the patch are removed in two iterations to obtain a
miniaturized antenna. The proposed fractal antenna has a great potential of application and gives a
stable radiation performance in the frequency range of 1.333 GHz to 2 GHz.
Analysis of Metamaterial Based Microstrip Array Antennaijceronline
Metamaterials have been intensively researched due to their peculiar features such as negative permittivity and/or permeability and ultra-refraction phenomenon. To satisfy the demand of commonly used wireless communication systems, an antenna which can operate at higher frequencies and enhanced characteristics are desirable. The arrangement of all elements is done that they provide an improvement in bandwidth, directivity return loss etc. The frequency response of a metamaterial can be tailored by varying its characteristics. A new metamaterial structure using square and ring split ring resonator is proposed. Using this metamaterial structure, a microstrip patch antenna is designed with enhanced characteristics such as reduction in return lossfrom-20dB to -36dB with tunability is achieved.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Multiband Circular Microstrip Patch Antenna for WLAN Applicationtheijes
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.
This paper presents the Microstrip patch antenna for WLAN applications with planar geometry and it consists of a defected ground (DGS), a feed, a substrate, and a patch. The design with DGS has been analyzed taking different dimensions of H Slot and achieve optimized dimensions with the help of CST, Microwave Studio commercial software for WLAN band at 5.20 GHz frequency with corresponding bandwidth of 310 MHz to optimize antenna’s properties. Results show that the final designed antenna has favorable characteristics at this frequency.
Electrically Controlled Frequency Reconfigurable Comb Type Antenna for Wirele...IDES Editor
Electrically controlled frequency reconfigurable
comb type antenna is presented in this paper. Reconfigurability
is achieved by placing a PIN diode in each slot of the comb
type antenna. The proposed antenna has very compact size
and works on 8 different bands depending upon the state and
number of PIN diode (ON/OFF). Ansoft Designer 7 is used to
simulate the equivalent model for the PIN diode and proposed
antenna is fabricated on FR4 substrate using photolithography
process. As the antenna reconfigure its resonating frequency
from 1st band to 8th band, directivity increases from 3.28 to 4.02
and radiation efficiency increases from 75.3% to 93.45% due
to the improvement in impedance matching at higher band.
Reconfigurable Microstrip Patch Antenna for Frequency Diversity Using RF MEMSIOSR Journals
A novel reconfigurable patch antenna for frequency diversity is proposed by reconfiguring its
geometry using tree rectangular tapes that are connected to the patch via six RF MEMS switches. So switching
between the different frequency bands is achieved by using capacitive series RF-MEMS switches. The antenna
was designed to operate at 2.6 GHz, 3.1 GHz, 3.5 GHz and 5 GHz
Bandwidth enhancement of rectangular microstrip patch antenna using slotsIOSR Journals
In this paper, a new design of rectangular microstrip patch antenna (RMPA) without slot, with slots
and array is proposed and analyzed. The designed antenna has been simulated using HFSS software. The
simulated results for return loss, radiation pattern and gain are presented and discussed. The bandwidth of
proposed antenna is 2.4GHz-5.9GHz for VSWR(voltage standing wave ratio)<2><-
10dB return loss as an acceptable reference in wireless applications which cover worldwide interoperability for
microwave access (WiMAX) and wireless local area network (WLAN) and other applications. Gain of 10dB is
achieved for antenna array.
Development of a Cassava Starch Extraction Machineijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Design & Study of Microstrip Patch Antenna.The project here provides a detailed study of how to design a probe-fed Square Micro-strip Patch Antenna using HFSS, v11.0 software and study the effect of antenna dimensions Length (L), and substrate parameters relative Dielectric constant (εr), substrate thickness (t) on the Radiation parameters of Bandwidth and Beam-width.
MicroStrip Antenna
Introduction .
Micro-Strip Antennas Types .
Micro-Strip Antennas Shapes .
Types of Substrates (Dielectric Media) .
Comparison of various types of flat profile printed antennas .
Advantages & DisAdvantages of MSAs .
Applications of MSAs .
Radiation patterns of MSAs .
How to Optimizing the Substrate Properties for Increased Bandwidth ?
Comparing the different feed techniques .
The Myth of Softening behavior of the Cohesive Zone Model Exact derivation of...ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
MINIATURISATION OF PATCH ANTENNA USING NOVEL FRACTAL GEOMETRYIAEME Publication
In the Field of low profile antennamicro strip patch antennas have attracted many researchers due to small sizeand low cost of fabrication. One of trending member of new designs is Fractalantenna. Fractal shapes are recursive/repetitive self-similar geometries, dueto this self-similarity they can provide high gain, multiband, widebandsolutions and design miniature antenna. Fractal shapes are widely used incomputing, analysis and design; recent trends suggest positive outcomes ofusing fractal shapes in electromagnetics and communication system. In thispaper Jerusalem cube fractal shape is introduced in probe fed conventionalpatch antenna for L1 band. A dual band antenna resonating at 1.41 GHz (L) and3.37 (S) GHz, band is constructed using said fractal shape.
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONS jantjournal
A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3. The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of
3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.
PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONS jantjournal
A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3 . The measured results indicate that the proposed
antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi
and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.
PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONS jantjournal
A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3. The measured results indicate that the proposed
antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for
the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi
and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.
PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONS jantjournal
A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3 The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability
Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.
PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONSjantjournal
A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3. The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability
Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.
PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONS jantjournal
A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3. The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.
Development of patch stack antenna for CP-SAR sensorjournalBEEI
In this paper, we obtain the basic configuration of the left-hand circular polarization (LHCP) array two patches stack triangular truncated microstrip antenna. This construction use the basic corporate feed microstrip-line with modified lossless T-junction power divider on radiating patch for circularly polarized-synthetic aperture radar (CP-SAR) sensor embedded on airspace with compact, small, and simple configuration. The design of Circular Polarization (CP) is realized by truncating the whole three tips and adjusting the parameters of antenna at the resonant frequency, f=5.2 GHz. The results of characteristic performance and S-parameter for the LHCP array two patches stack antenna at the resonant frequency show successively about 7.24 dBic of gain, 1.99 dB of axial ratio (Ar), and -11.43 dB of S-parameter. Moreover, the impedance bandwidth and the 3 dB-Ar bandwidth of this antenna are around 560 MHz (10.77%) and 50 MHz (0.96%), respectively.
IRJET- Design and Analysis of Microstrip Antenna for 5G Applications
International Journal of Computational Engineering Research(IJCER)
1. International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 6
CPW Feed Patch Antenna for GPS Applications
Yashu Rajput1, Tejender Singh Rawat2 and Leena Varshney3
1,2,3
(Department of ECE, ASET, Amity University, Noida, India)
Abstract
In this paper we are proposing a CPW-Fed patch antenna. This paper presents the design of rectangular patch microstrip
antenna for the frequencies at L1 (1.67 GHz to 1.90 GHz) and L2 (2.65 GHz to 3.05GHz). The simulation is done by using the
HFSS software, which is a full-wave simulation tool, based on the method of moments The bandwidth of the proposed
antenna reaches about 230MHz & 400MHz with the return loss of about -30dB & -28dB respectively over the chosen
frequency spectrum.
Keywords: CPW-Feed, Microstrip Patch Antennas, Radiation Pattern, Return Loss.
Introduction
The GPS (Global Positioning System) has revolutionized navigation and position location. It is now the primary means of
navigation for most ships and aircraft and is widely used in surveying and many other applications like tracking, mapping, and
determining the location. With the advancement of technology, GPS is now been widely used by the public for their
navigation purposes. The main reason for its increase in demand is its light weight, compact in size and most important it has
low cost with high precision and reliability.
This high demand for GPS has prompted the antenna designers to increase the investigation on Microstrip radiators, with
particular attention paid to improving performance and miniaturization. Microstrip antennas have enjoyed proliferate use in
many circularly polarized applications due to their low-profile light weight and useful radiation characteristics.
A Microstrip or patch antenna is a low profile antenna that has a number of advantages over other antennas it is lightweight,
inexpensive, and easy to integrate with accompanying electronics. While the antenna can be 3D in structure (wrapped around
an object, for example), the elements are usually flat; Hence their other name, planar antennas. Note that a planar antenna is
not always a patch antenna. The following drawing shows a patch antenna in its[1][5] basic form: a flat plate over a ground
plane (usually a PC board). The center conductor of a coax serves as the feed probe to couple electromagnetic energy in and/or
out of the patch. The electric field distribution of a rectangular patch excited in its fundamental mode is also indicated.
Figure.1 Patch Antenna in Basic Form
The electric field is zero at the center of the patch, maximum (positive) at one side, and minimum (negative) on the opposite
side. It should be mentioned that the minimum and maximum continuously change side according to the instantaneous phase
of the applied signal. There are several methods to connect the radiating patch to feeder which are coaxial cable, Microstrip
line feed, aperture coupled feed and the proximity coupling feed. Impedance matching is usually needed between feed line and
radiating patch as the input impedance may differ from characteristics impedance 50 Ω. But here we are using the CPW-feed
Microstrip patch antenna[2] because it have many features such as low radiation loss, less dispersion, easy integrated circuits
and simple configuration with single metallic layer, and no via holes required[6]. The CPW fed antennas have some more
attractive features such as wider bandwidth, better impedance matching, and easy integration with active devices and
monolithic integrated circuits.
Issn 2250-3005(online) October| 2012 Page 5
2. International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 6
Coplanar Waveguide Feed Structure
Feed line is one of the important components of antenna structure given below in Figure-2. Coplanar waveguide [3][4]
structure is becoming popular feed line for an antenna. The coplanar waveguide was proposed by C.P. Wen in 1969. A
coplanar waveguide structure consists of a median metallic strip of deposited on the surface of a dielectric substrate slab with
two narrow slits ground electrodes running adjacent and parallel to the strip on the same surface. This transmission line is uni-
planar in construction, which implies that all of the conductors are on the same side of the substrate.
Figure.2 CPW Feed Structure
Etching the slot and the feed line on the same side of the substrate eliminates the alignment problem needed in other wideband
feeding techniques such as aperture coupled and proximity feed.
Antenna Design and Structure
Figure.3 Geometry of CPW-Feed Patch
Figure.4 3D Structure of CPW Feed Micro-strip Antenna
The geometry of the proposed antenna is shown in Figure.3 & its 3D design is shown in figure.4. The design of the antenna is
started with determination of important parameters which directly influenced the antenna performance. Using rectangular we
got bi-directional radiation. The antenna has been designed on Arlon880 substrate with relative dielectric constants of 2.17
with the following dimensions : Length of ground plane(L) = 10 mm, Width of ground plane(W) = 7.5 mm, Length of the
patch(Lp)= 4.3 mm ,Width of the patch(Wp) = 1.58 mm , Height of substrate = 0.254 mm, The slot thickness (t) = 0.4mm and
the width of the central strip(x) are 0.2mm & Ld = 5.3mm.The patch was designed to achieve the bandwidth of 230MHz &400
MHz respectively at 3.5 GHz frequency. . The width of slot of CPW feed line is 0.254mm to match the impedance
characteristic of 50Ω. As seen the measured return loss is -30dB & -28dB at the resonating frequency of 1.79GHz & 2.83GHz
respectively.
Issn 2250-3005(online) October| 2012 Page 6
3. International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 6
Results & Discussion
Figure.5 Return loss of CPW feed Microstrip Antenna
Figure.6 Radiation pattern of microstrip antenna
Figure.7 3D Radiation pattern of microstrip antenna
For the proposed antenna design, HFSS simulation software is used, which is full wave electromagnetic simulation software
for the microwave and millimeter wave integrated circuits. First, the simulation was started with a CPW-fed rectangle shaped
patch antenna. Then we achieved two bandwidth . The simulated return loss,2D & 3D radiation pattern of the CPW Feed
Microstrip antenna is shown in Fig.5, Fig.6 and Fig.7 respectively. At resonant frequencies of 1.79 GHz and 2.83 GHz, the
antenna had return loss at -30 dB and -28 dB respectively. The simulated impedance bandwidths (10dB return loss) are 230
MHz at 1.79 GHz and 400 MHz at 2.83 GHz, which shows that the antenna has a good impedance matching and feed location
at both frequencies. Radiation Pattern shows that the antenna has good power radiation at the frequencies 1.79 GHz and 2.83
GHz.
Issn 2250-3005(online) October| 2012 Page 7
4. International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 6
Conclusion
A new CPW-fed Microstrip Antenna is proposed for the UHF applications. The antenna has small size with good impedance
matching. Simulation results shows at L1 and L2, the antenna has return loss at -30dB and -28 dB respectively. And the
bandwidth of the antenna is approximately 230MHz & 400MHz ranging from 1.67 GHz to 1.90 GHz and 2.65 GHz to
3.05GHz. The designed antenna can be used for WLAN, Bluetooth , WiMAX & GPS applications.
References
[1]. D. Orban and G.J.K. Moernaut ,The Basics of Patch Antennas Orban Microwave Products.
[2]. Ettak, K,et.al., A novel variant 60-GHz CPW-fed patch antenna for broadband short range wireless communications ,
Antennas and Propagation Society International Symposium, 2008. AP-S 2008. IEEE,pp1-4, July 2008.
[3]. Leena Varshney, Vibha Rani Gupta, Harish kumar , Priyadarshi Suraj ,CPW-Fed Broadband Microstrip Patch Antenna,
Published in International Journal of Advanced Engineering & Application, Jan 2011.
[4]. Pozar D.M., Schaubert D.H. (1995) Microstrip Antennas. New York: IEEE press.
[5]. C.A. Balanis, Antenna Theory Analysis and Design (John Wiley & Sons, Inc., 1997).
[6]. K. L. Wong, Compact and Broadband Microstrip Antennas, Wiley, 2002.
Issn 2250-3005(online) October| 2012 Page 8