Patch Antennas

Use of discontinuities in ground planes or in microstrip lines is currently employed to improve the performance of different passive circuits. It includes size reduction of amplifiers; enhancement of filter characteristics and applications to suppress harmonics in patch antennas. This paper presents an improved method of size reduction of a microstrip antenna using Defected Microstrip Structure. It does so by

This paper presents the general design of microstrip antennas using artificial neural networks for rectangular patch geometry. The design consists of synthesis in the forward side and then analyzed as the reverse side of the problem. In this work, the neural network is employed as a tool in design of microstrip antennas. The neural network training algorithms are used in

Page 1. Design of Microstrip Patch Antennas Using Neural Network Vivek Singh Kushwah and *Geetam Singh Tomar; Member IEEE Amity School of Engineering & Technology, New Delhi –India *Vikrant Institute of Technology & Management Indore 452001 India ...

Microstrip antenna arrays have found broad applications in recent years and the reduction of mutual coupling is an important criterion in their design. The FDTD method is applied to analyze probe fed patch antennas and the simulated results agree well with the experimental results of R.P. Jedlicka et al. (see IEEE Trans. Antennas Propagat., vol.29, p.147-9, 1981). The mutual coupling of patch antennas on a high dielectric constant substrate, which is of growing interest due to its compact size and conformability with MMIC, is characterized in detail. Such antennas have larger mutual coupling than antennas on a low permittivity substrate because of the pronounced surface waves. The electromagnetic band-gap structure introduced by D. Sievenpiper et al. (see IEEE Trans. MTT, vol.47, p.2059-74, 1999) is then employed to inhibit the surface waves so that the mutual coupling is greatly reduced.

In this paper, the geometrical theory of diffraction (GTD) (R.G. Kouyoumjian and P.H. Pathak, Proc.IEEE, vol. 62, pp. 1448-1461, 1974) is employed to examine the finite ground plane effect for circularly polarized patch antennas. It is shown that a finite ground plane has a small effect on the radiation patterns of circularly polarized microstrip antennas in the forward direction. However, the effect on backside radiation and axial ratio in the forward radiation is noticeable when the four ground plane edges are asymmetric. This effect should be taken into consideration in designing circularly polarized microstrip antennas, and arrays, since their axial ratio bandwidth is generally very narrow.

This paper reports the design, packaging and characterization of a miniaturized dual-mode radio-frequency (RF)/free space optical (FSO) indoor wireless receiver module. Two different patch antennas are designed and integrated with bare die photodiodes together with transimpedance amplifier (TIA) circuits on a printed circuit board (PCB). Ansoft HFSS is used to predict the coupling from RF to FSO link. Measurement results verify that optical link degradation is minimized with the specially designed patch structure. FSO link operation at 2 Gb/s in a 10 GHz RF environment is achieved. Through the comparison to previously developed RF/FSO modules, the new receiver boards demonstrate reduced RF-to-optical cross channel coupling, and increased gain and antenna radiation efficiency.

We introduced a new concept of a coplanar patch antenna (CPA) and presented simulation and experimental results for the antenna. The coplanar patch antenna consists of a patch surrounded by closely spaced ground conductor and a CPW feed line, which has a similar geometric configuration as the loop slot antenna. Simulation and experiment results clearly demonstrated that the CPA behaves,

A broadband circularly polarized stacked patch antenna for UHF RFID application has been presented and investigated in this paper. The measured results have shown the good antenna performance with gain of more than 6.5 dBic, return loss less than -10 dB, and axial ratio less than 3 dB within the frequency range of 820-985 MHz (18.3 %). Due to the broadband performance covering the whole RFID UHF band, it is a good candidate for a reader antenna with high performance and low cost.

ABSTRACT Multi-band antennas are very important in many application systems such as mobile phone jammer. A new shape triple-band microstrip antenna is proposed in this paper. By embedding h-shaped slots placed in the centre of a microstrip patch, the triple-band character can be achieved. Procedures to select the length and location of the h-shaped slots were discussed in detail. The required antenna gain, input impedance, radiation pattern and return losses were achieved.