Abstract
In this article, a novel inverted L-shaped microstrip-fed wideband circularly polarized (CP) modified square-slot antenna is designed. By cutting a pair of triangle chamfers and introducing a pair of triangle patches at the square-slot, the antenna achieves a wideband CP radiation. Moreover, CP performance of the antenna can also be remarkably enhanced by protruding an L-shaped strip and embedding a tuning rectangle slot into the slot ground. The measured results demonstrate that the axial-ratio bandwidth for AR < 3 is 75.1% (from 4.45 to 9.8 GHz) and the impedance bandwidth (|S11| < −10 dB) reaches 65.8% (from 4.95 to 9.8 GHz). In addition, surface current studies are performed to illustrate the operating mechanism of CP operation, and the antenna has bidirectional radiation characteristics with an average gain of ~4 dBic within the CP band.
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