This work presents a fullwave analysis for annular ring microstrip antennas on uniaxial anisotropic substrates. The effect of the anisotropic substrates on the antenna performance at the millimeter wave band is investigated. The analysis is performed in the Hankel transform domain using Hertz vector potentials and Galerkin Method. Numerical results are presented for the antenna main characteristics such as resonant frequency and radiation pattern.

Annular Ring Microstrip Antennas for Millimeter Wave Applications

In this paper, a comparative study of co-planar gap coupled rectangular and elliptical microstrip patch antenna is presented It is analyzed by using circuit theory concept The proposed antennas show ultra wideband operations which depend on dimensions of the patches, gap between them as well as air gap thickness It is observed that the performance of gap coupled elliptical patch antenna is better than that of rectangular patch antenna while the area of rectangular and elliptical patches is same The bandwidth of proposed rectangular patch antenna is found to be 507 % with average gain of 65 dBi while for elliptical patch antenna the bandwidth and gain further improves up to 576 % and 95 dBi respectively The theoretical results are in good agreement with the simulated results obtained from IE3D simulation software

Ultra Wideband Co-planer Microstrip Patch Antenna for Wireless Applications

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Desenvolvimento de Antenas de Microfita com Patch em Anel Utilizando Materiais Ferrimagnéticos e Metamateriais

This paper presents a full-wave analysis of microstrip antennas with annular ring patches printed on double dielectric anisotropic substrates. The problem is formulated in Hankel transform domain. Green's functions are determined by application of Hertz vector potentials formulation. Galerkin's method and Parseval's theorem are used to obtain the resonant frequen- cies. Numerical results are presented and discussed for the resonant frequencies and radiation patterns. 1. INTRODUCTION There are many commercial applications such as mobile radio and wireless communications that use patch antennas. The interest in designing of such microstrip antenna has increased because of light weight, easy production, conformability, and so forth. In this class of antennas, the annular- ring microstrip antennas exhibit interesting features associated with the annular ring patch. For a given frequency, these antennas, when operating in the fundamental mode, have smaller size as compared to the rectangular or circular patch antennas (1{4). This characteristic allows the antenna elements in array designs to be more compacted, favoring the ∞exibility and the miniaturization of the antenna arrays. The small size is an important requirement for portable communication equipment, such as global positioning satellite (GPS) receivers. Moreover, when compared to the circular patch antenna, the annular ring microstrip antenna has less stored energy and larger bandwidth (5{9). Much of the previous work on annular-ring microstrip antenna has been devoted to antennas on isotropic substrates. However, many materials used in microstrip structures have some degree of natural anisotropy, or unintended anisotropy due to material processing. These materials provide ∞exibility and accurate in integrated circuit design and can be used to overcome patch antennas limitations imposed by the dielectric substrates (1,4). It is the aim of this work to perform an accurate and e-cient analysis of annular-ring microstrip antennas on double uniaxial anisotropic substrates, as well as to perform the analyses for annular ring microstrip antennas on a single layer substrate and on a suspended substrate, as particular cases. The analysis uses the full-wave formulation by means of the Hertz vector potentials method in the Hankel transform domain. The dyadic Green function and Galerkin's method are used to determine the resonant frequencies and radiation patterns (3). The analysis for suspended annular ring microstrip antenna shows that various parameters of the annular ring patch antenna depend on the thickness of the air gap between the anisotropic substrate and the ground plane. Instead of controlling the resonance frequency by changing the radii of annular ring patch, it is also possible to adjust the antenna resonant frequency by varying the height of the air layer thickness. 2. THEORY The geometry under consideration is shown in Figure 1. The antenna substrate consists of two anisotropic dielectric layers (regions 2 and 3) having permittivity

Annular Ring Microstrip Patch Antenna on a Double Dielectric

In the present paper, annular ring patch antenna with L-probe feeding has been analyzed using modal expansion cavity model. The proposed antenna shows wide band and ultra wide band operation which depends on the position of L-probe feeding and position of the shorting pin. For the fundamental $$\hbox {TM}_{11}$$ TM 11 mode, the bandwidth and gain is found to be 38.85 % and 7.8 dBi while for higher order $$\hbox {TM}_{12}$$ TM 12 mode bandwidth is obtained 58.71 % with corresponding gain of 6.1 dBi. The effect of shorting pin on the proposed antenna is also studied and it is found that the radiating structure is more compact in nature and improves the bandwidth upto 47.37 % with 8.0 dBi gain. Further, the proposed antenna has broadside radiation pattern over the entire bandwidth. The theoretical results are compared with IE3D simulated results which are in good agreement.

Analysis of L-probe Proximity Fed Annular Ring Patch Antenna for Wireless Applications

An accurate and efficient method is presented for computing the resonant frequencies of an annular-ring microstrip antenna with an air gap. The formulation of the problem is carried out rigorously using the full wave analysis. The method of analysis is based on Galerkin's method applied in the Hankel transform domain. The calculated results for the resonant frequencies are presented as a function of the width of the air gap and some are compared with the measured results available in the literature. Excellent agreement between theory and experiment is obtained, and the validity of the present method is confirmed. >

Z. Fan

Papers

Hankel transform domain analysis of an annular-ring microstrip antenna with an air gap