Abstract
Resonance in annular-ring microstrip resonator with uniaxially anisotropic substrate and superstrate layers is analysed in Hankel Transform domain using immitance approach. Resonant frequency shift due to uniaxial anisotropy is firstly investigated for different anisotropy ratio values of substrate and superstrate layers with respect to each other. The results obtained indicate that resonant frequency of anisotropic resonator has higher or lower values as compared to isotropic case according to the adjustment of the layer anisotropies. Then, the effect of inclusion of air gap layer inserted between substrate and ground plane on the resonance characteristics is also investigated for different superstrate anisotropies. The overall results provide helpful design criterias for the more efficient operation of microstrip ring for communications and integrated circuit applications.
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