Abstract

Circularly polarized microstrip antennas have inherent narrow axial ratio bandwidth and beamwidth is close to 90°. The axial ratio (AR) bandwidth can be increased by using a U-slot. In this paper, a U-slot loaded microstrip patch antenna is mounted on a conical ground to increase the AR beamwidth. This results in simultaneous increase in both the AR bandwidth and the AR beamwidth which as per the author's knowledge is rare to achieve. The AR bandwidth obtained is 2.18% and the AR beamwidth is around 140°. The half power beamwidth (HPBW) is also around 130°.

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