Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

Abstract

Abstract-In this paper, the effect of both uniaxial anisotropy in the substrate and air gap layer on the resonant frequency and bandwidth of circular microstrip patch are investigated. The problem is rigorously formulated based on the spectral domain technic in conjunction with Galerkin approach for computing the resonant frequency, half-power bandwidth, and radiation field of a tunable circular patch antenna which is printed on isotropic or uniaxial anisotropic substrate. The TM set of modes issued from the magnetic wall cavity model theory are used to expand the unknown currents on the patch. Resonant frequency shift due to uniaxial anisotropy is firstly investigated for different anisotropy ratio values of substrate. Then, the effect of inclusion of air gap layer inserted between anisotropic substrate and ground plane on the resonance characteristics is also investigated. The results obtained from this approach are in very good agreement with the experimental results available in the literature.

Efficient CAD Model to Analysis of High Tc Superconducting Circular Microstrip Antenna on Anisotropic Substrates

“…These models have allowed assessing, with a good approximation, the different characteristics of planar structures made in microstrip technology [13]. Among them, fewer researchers [14][15], have investigated the effect of the anisotropic substrate on the resonant characteristics of conventional conducting microstrip antennas. However, they have not studied thoroughly the effect of the superconducting patch on the resonant features of the antenna printed on uniaxially anisotropic substrates.…”

Modeling and Design of Anisotropic Circular Microstrip Patch Antenna Using Neurospectral Computation Approach

“…Green's function in the vector Hankel transform domain [16]. Note that in the vector Hankel transform domain, the dyadic Green's function is diagonal and it is independent of the geometry of the radiating patch.…”

“…..,Q), and while integrating from 0 to a, and using the Parseval's theorem for vector Hankel transform [16], we obtain a system of linear P+Q algebraic equations for each mode n which can be written in the matrix form:…”

“…The tangential electric field is null on the conducting patch, which leads to an integral equation. To solve the integral equation, we apply the procedure of Galerkin which consists in developing the unknown distribution of the current on the circular patch is expanded into a series of basis functions [14][15][16]. The basis functions chosen in this article for approximating the current density on the circular patch are obtained from the model of the cavity.…”

“…Generally the real part (fr) of the solution represents the resonant frequency of the structure, the imaginary part (fi) indicates the losses of energy per radiation and the ratio (2fi/ fr) gives the band-width (BW) and the quantities Q=(fr/2 fi) stands for the quality factor [14][15][16].…”