Properties of coupled microstrip patches on uniaxial anisotropic layers

The effect of the substrate dielectric anisotropy on the resonant frequency behavior of coupled microstrip patches is investigated. In the analysis, the Hertz vector potentials in the spectral domain are used to determine the expressions for the field components and the moment (Galerkin) method is used to obtain the determinantal equation for the resonant frequency. A two layers uniaxial anisotropic dielectric substrate is considered. Numerical results are presented for the resonant frequency as function of the anisotropy ratio of one of the dielectric layers. Agreement with the results available in the literature for several particular cases was observed.