Full-wave analysis of circular microstrip resonators in multilayered media containing uniaxial anisotropic dielectrics, magnetized ferrites, and chiral materials

Abstract

In this paper, Galerkin's method in the Hankel transform domain is applied to the determination of the resonant frequencies, quality factors, and radiation patterns of circular microstrip patch resonators. The metallic patches are assumed to be embedded in a multilayered substrate, which may contain uniaxial anisotropic dielectrics, magnetized ferrites, and/or chiral materials. The numerical results obtained show that important errors can be made in the computation of the resonant frequencies of the resonators when substrate dielectric anisotropy, substrate magnetic anisotropy and/or substrate chirality are ignored. Also, it is shown that the resonant frequencies of circular microstrip resonators on magnetized ferrites can be tuned over a wide frequency range by varying the applied bias magnetic field. Finally, the computed results show that the resonance and radiation properties of a circular microstrip patch on a chiral material is very similar to those of a circular patch of the same size printed on a nonchiral material of lower permittivity.

Specteral Domain Analysis of Resonant Characteristics and Radiation Patterns of a Circular Disk and Annular Ring Microstrip Antenna on Uniaxial Substrate

“…The experimental results have shown that circular microstrip elements could be easily modified to produce a range of impedances, radiation patterns and frequencies of operation [10]. The studies on circular patch microstrip antennas with anisotropic substrate are in limited number [11][12][13][14].…”

Analysis of Annular Ring Microstrip Patch on Uniaxial Medium via Hankel Transform Domain Immittance Approach

“…Spectral domain analysis has been found to be advantageous in the design of microstrip components such as antennas and resonators providing Green's functions in closed form [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…In spectral domain analysis, by imposing the boundary conditions on the transformed field expressions, Green's functions can be determined in rectangular and cylindirical coordinates using Fourier Domain [4-6, 8, 9] or Hankel Trasform Domain formulations [2,3,7,[11][12][13][14][15][16][17][18]. In the case of multilayered substrates and superstrates, such a formulation process requires lengthy field derivations and application of multiple boundary conditions [9,13].…”

“…In the case of multilayered substrates and superstrates, such a formulation process requires lengthy field derivations and application of multiple boundary conditions [9,13]. Instead of this procedure, immitance approach has been preferred in Fourier Transform Domain as presented by Itoh [1].…”

Circular Polarized Carbon-NanotubePatch Antenna embedded in Superstrates Anisotropic Media

“…Several composite materials as replacement for metals were studied in many recent studies [6][7][8]. Due to electrical properties and favorable mechanical Carbon Nanotube Composites have been used for electromagnetic applications [9][10][11][12].In this study, using the dyadic Green's function formulation the electric and magnetic fields in the upper half-space due to the current distribution on the Star Patch are obtained [13]. The Sommerfeld-Weyl-type integrals of electric and magnetic fields are calculated in the radiation zone or far-field region [13].…”