Abstract
A compact widebeam circularly polarized antenna with wide impedance and axial ratio (AR) bandwidths is proposed in this study. The antenna is composed of a pair of crossed dipoles, four sequentially rotated parasitic elements, a slotted ground plane with four vertical plates, and four inverted L-shaped structures. A prototype is fabricated and measured. An impedance bandwidth (S11 < −10 dB) of 102.4% and a 3-dB AR bandwidth of 83.5% are measured. And half-power beamwidth is more than 120° over the whole operating band. Radiation patterns are symmetrical and identical in both principal planes. The compact size of antenna is 0.42λ0 × 0.42λ0 × 0.16λ0.
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