Abstract

This paper presents the radiation performance of a modified elliptical patch microstrip antenna (EPMA) simulated on FR4 substrate. The elliptical microstrip antennas with small values of eccentricity have been employed to produce circular polarizations (CPs) with the use of single feed point. Theoretical model for an antenna is developed using modal cavity model and circuit theory concept. The arrangement of antenna resonates at four frequencies 5.75 GHz, 6.375 GHz, 8.25 GHz and 13.625 GHz, respectively. The first two frequencies are closely spaced and give an improved bandwidth. The results also show that the compactness is also obtained in the antenna structure. Details of the antenna design approach and theoretical results are presented and discussed systematically.

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