Annular Ring Microstrip Antennas for Millimeter Wave Applications

Abstract

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.

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 later studies on microstrip structures, anisotropic materials, especially the uniaxially anisotropic ones have been considered due to their advantages [13][14][15][16][17][18]. It is known that some metamaterials exhibit uniaxial type anisotropy both in permittivity and permeability tensors [19].…”

“…Annular-ring microstrip as another important type of circularly symmetric type microstrip patch has been preferred in the design of various microwave components, in the measurement of permittivity values of unknown dielectric substrates and in medical hyperthermia applications in its isotropic form [10][11][12]. These structures are also designed using uniaxially anisotropic materials and analyzed in spectral domain [14,17,18]. In some recent studies, new designs of annular ring microstrip structure for different purposes are also presented [20,21].…”

“…Hertz vector formulation in the same domain has later been used for double substrate, uniaxially anisotropic annular ring microstrip antenna by Vasconcelos et al [17]. Then in a recent study, superconducting annular ring microstrip antenna on a uniaxially anisotropic media is analyzed using lengthy field formulations in spectral domain [18].…”