Abstract
Effect of cylindrical metallic cavity enclosure on resonant frequency of the annular ring microstrip antenna (ARMSA) having air-gap between substrate and ground plane is studied. The proposed antenna is analyze theoretically using modal expansion cavity model and circuit theory concept and verified by simulated results using Ansoft HFSS simulation software and experimental results. Theoretical and measured result of input characteristics shows good agreement with simulated results. Effect of cylindrical metallic cavity backing on resonance frequency of ARMSA is investigated for different air gap height and inner patch radius. The patch miniaturization of about 15 % is achieved using cavity backed ARMSA.
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