Abstract
This paper describes the gain and bandwidth improvement of a circular microstrip patch antenna using two substrates separated by an air layer between them. The microstrip patch antenna was fed by line and included an air layer between two substrates. The circular microstrip antenna with an air gap between two substrate and ground plane is analyzed using the cavity model theory. The gain of this antenna was 2.4 db greater than that of a conventional circular patch antenna. The bandwidth of this antenna was 1.33% greater than that of a conventional circular patch antenna. The method of computation uses MOM and this is simulated by using HFSS software.
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