Abstract
A novel broadband circularly polarized antenna is presented in this letter. It consists of a triangular monopole and a slot etched on the ground plane. By employing a branched microstrip feedline to excite the monopole and the slot in parallel, the broadband circular polarization performance of the proposed antenna is realized with overall size of 38 × 54 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The measured 3-dB axial-ratio bandwidth is 46.8% ( 2.13 ~ 3.43 GHz), and the impedance bandwidth for S 11\leqslant -10 dB is 73.0% ( 1.99 ~ 4.28 GHz). Good agreement between the simulated and measured results is also achieved, validating our design concept. The surface current analysis and a parametric study of the design are also carried out to explain the mechanism of circular polarization .
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