A numerically efficient full-wave analysis of a tunable rectangular microstrip patch

Abstract

A full-wave analysis for determining the resonant frequency and half-power bandwidth of a rectangular microstrip antenna with an air gap is presented. To make the study more general and valid for various antennas structures; during the theoretical formulation the metallic patch is assumed to be embedded in a multilayered media containing isotropic and/or uniaxial anisotropic dielectrics. The proposed method for determining the Green's function leads to a concise form of this, expressed in terms of a 4 Â 4 matrix multiplication, which is easily implemented. Using Galerkin's method in solving the integral equation numerically, the complex resonant frequency of the microstrip antenna with an air gap is studied with sinusoidal functions as basis functions, which show fast numerical convergence. The numerical results for Galerkin's method and experiments are in good agreement. The air gap tuning effect on the resonant frequency and half-power bandwidth is investigated. Finally, numerical results for the effects of uniaxial anisotropy in the substrate on the operating frequency of the rectangular microstrip antenna with an air gap are also presented.

Spectral Domain Analysis of Resonant Characteristics of High Tc Superconducting Rectangular Microstrip Patch Printed on Isotropic or Uniaxial Anisotropic Substrates

“…In Eq. 8, h ¼ k z d. Now that we have the matrix representation of the anisotropic substrate characterized by the permittivity tensor, it easily to derive the dyadic Green's function of the problem in a manner very similar to that shown in [5,17] …”

Hankel transform domain analysis of covered circular microstrip patch printed on an anisotropic dielectric layer

“…Furthermore, superstrate layers are often used to protect the microstrip antenna from its environment hazards, especially when placed on aircrafts and missiles [4,8,9]. During recent years, great interests have been shown in using microstrip antenna deposited on anisotropic substrate since the substrate anisotropy could have important applications on the operation of microstrip antennas [10][11][12]. With the increasing complexity of geometry and material property, designing these antennas requires more and more dedicated and sophisticated computer aided-design (CAD) tools to predict the characteristics.…”

“…The method of moments (MoM) has been proven to be one of the most powerful CAD tools for solving this class of problems. By now, a number of microstrip antennas with anisotropic substrate have been investigated using the MoM based spectral domain analysis method [10][11][12]. Many works have studied the effect of uniaxial anisotropy on the resonant characteristics of a single-layer circular microstrip antenna in [13][14][15][16][17], where the positive and negative uniaxial anisotropies were considered.…”

Fourier Transform Domain Analysis of High T c Superconducting Rectangular Microstrip Patch over Ground Plane with Rectangular Aperture

“…The basis functions used for the approximation of the current density on the high T c superconducting patch of Fig. 1 are very similar to those used in [13] for approximating the current density on a perfectly conducting patch. They are given by…”

“…As explained in [13] (see Eq. 6 and (38)), all these dyadic Green's functions can be obtained in a straightforward way in terms of their vector Fourier transform version, which, in turn, can be determined very efficiently using the explicit expressions shown in [9,.…”