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A ѱ-shaped micro-strip patch antenna is designed on a square ground plane with an inverted E slot is presented. ѱ patch is just below an inverted E slot on square ground plane and it is fed with a co-axial probe. The effect of size and shape of the slot on the ground plane and on patch are varied and are proposed as antennas A to E. The proposed antenna design parameters are varied to maximize the...
The need in today's wireless applications is to design antennas that are compact, robust and effortless to integrate with RF circuit components. Microstrip patch antenna is one such type which satisfies these requirements. But the two main performance parameters of an antenna namely the gain and the bandwidth are near to the ground for patch antennas. Usually the gain range of a patch antenna is 1–2dB...
In this paper a highly broadband circularly polarized patch antenna design is shown. The design features several novelties which includes the use of a 3-phase feed circular patch for optimal axial ratio and the 3-phase microstrip feed structure to excite the patch antenna. Combining those techniques provides superior bandwidth in both return loss and axial ratio compared to classical rectangular patch...
The rectangular microstrip patch antenna with V shape slot is presented in this paper (Fig. 1). With this new configuration 33.5% impedance bandwidth with stable radiation pattern is achieved.
The single layer U-slot rectangular patch antenna has been found to provide impedance bandwidth of about 30% [1]. A bandwidth of up to 40% is obtained with a U-slot patch antenna stacked with a parasitic patch [2]. In this paper the effect of second U-slot stacked with the same geometry is presented, Fig. 1. A bandwidth as high as 46% is obtained.
The usefulness of broadband impedance matching to increase the bandwidth of a microstrip patch antenna is illustrated using three different antenna configurations. Measured data for a patch antenna was incorporated into commercial CAD software to design a matching network. Design limitations are also discussed. Practical design examples and experimental results are given which clearly demonstrate...
It is well known that the bandwidth of a microstrip antenna can be increased by overlaying a parasitic element or director. A radioelectric model was presented [l] to explain this property in the case of a rectangular patch antenna. The purpose of this communication is a generalization of the analysis for an arbitrary shape symmetrical patch antenna coupled with a director. A quasi TEM two coupled...
Although conventional microstrip patch antennas have attractive features of easy fabrication and compatibility with MMICs, but they have a narrow bandwidth and large size in some of applications at low frequency bands [1]. In phased array applications, smaller antennas could be packed tightly to take advantages of lower angle scanning as well as reduction of mutual coupling [2]. Hand held communications...
A rigorous analysis of an aperture-coupled stacked microstrip antenna is described. Developed from a coupled integral equation set employing spectral-domain Green's functions, the analysis includes all coupling, radiation and surface-wave effects. Optimization of the patch dimensions yielded VSWR bandwidths of greater than 20%. Theoretical and measured responses exhibited excellent agreement.
In this paper, the design of circular microstrip patch antenna with sandwiching the substrates has been proposed for bandwidth enhancement. The proposed antenna is designed at 2.7GHz (S-band) using High Frequency Structural Simulator. The circular patch antenna is designed on two different substrates, FR4_epoxy and RT Duroid 5880™ and fabricated on the three layer FR4-epoxy substrate. The effect of...
The design of high antennas for wireless communication is very essential. The main drawback of the microstrip patch antenna is the low gain. The Metamaterial superstrate layer along with antenna structure improves the antenna performance parameters like gain and bandwidth. Due to Ultra refraction phenomenon, radiation is concentrated normal to the patch so that unwanted sidelobes can be avoided. This...
Modern communication devices supports higher bandwidth applications. So the antenna required for such applications should have wider bandwidth and should be smaller in size. Being easy to fabricate, low volume and inexpensive microstrip patch antenna is widely used for wireless communication applications. But disadvantages like low gain, narrow bandwidth, etc. limits the performance of microstrip...
This paper presents a U Shaped micro strip antennas with improved bandwidth operate at 3.8GHz. The proposed antenna will be in light weight, smart and compact unit compare with consists of metallic patch and ground between which is a dielectric medium called the substrate. The Proposed antenna also presents the detail steps of designing the U shaped micro strip antenna and the simulated result. U...
In this paper, the effect of varying the ground planes to the patch antenna bandwidth will be reported. In this study, a rectangular patch antenna with loaded capacitor will be studied. A capacitor loaded patch antenna can effectively reduce the needed size of the patch antenna. However, it usually accompanied with the loss of antenna efficiency due to the attraction of current into the capacitor...
A low profile monopolar patch antenna with conical beam radiation pattern and high gain performance is presented in this paper. The antenna has a simple structure which consists of a monopolar patch, a ground and a set of shorting pins. To enhance the gain performance, the antenna is designed to operate with TM03 mode and TM04 mode. The proposed antenna operates from 2.41 to 2.51 GHz for the VSWR...
Gain characteristics improvement of a broadband circularly polarized patch antenna using artificial ground structure is studied. The antenna has a simulated S11 bandwidth of 48.6% and axial ratio bandwidth of less than 3dB of 21.2%. However, gain characteristics of boresight direction decreases in the frequency range of 5.5GHz. In this paper, by modifying shapes of the ground plane, we attempted to...
A broadband circularly polarized patch antenna is proposed for WLAN system application. Seven identical curved branches extended from the circular patch are designed to generate circular polarization. Simultaneously, seven identical slots are symmetrically etched on the junction of each curved branch and the circular patch. The dimension of the antenna is reduced by 17.8% compared with no slots. The...
Microstrip patch antennas are widely used in various wireless applications such as Wireless local area network (WLAN). WLAN is capable of providing maximum data transfer rate of 600 Mbps. The proposed antenna design has a slotted H-shaped patch and dumbbell (H) shaped Defected Ground Structure (DGS) on Flame Retardant-4 (FR-4) substrate with the microstrip feeding technique which radiates at 2.4GHz...
The modern wireless communication systems require large bandwidth, high gain and small size antenna's with the purpose of providing enhance the performance over a broad range of frequencies. Due to this requirement direct to design a Microstrip rectangular patch antenna. The proposed design of microstrip antenna is reported, which is increased the bandwidth of microstrip patch antenna by cutting part...
The technique of multiple points feeding in order to achieve improved bandwidth performance is here exploited and used to feed a supershape structured radiator. The achieved operating bandwidth, is an important advancement compared to the performance of the usual, single fed and regularly shaped patch antennas. The proposed antenna operates from 2.5 to 3.9 GHz with linear polarization and its behavior...
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