Abstract-In this study, resonant frequency of annular-ring microstrip patch on uniaxial medium is determined using equivalent models of the structure obtained in Hankel Transform Domain depending on TE and TM mode decomposition. For the simplification of the tensor form formulations, equivalent matrix operators are defined in cylindrical coordinates instead of the differential ones. Then, eigenvalue problem is solved by the application of the moment method and obtained resonant frequency characteristics are compared with that of the isotropic case for different anisotropy ratio values and structural parameters. Equivalent circuit models for the structure having multilayered substrates and superstrates are given in order to be used in the following studies on uniaxially anisotropic circular type microstrip patches.
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