Novel square slot circularly polarized antenna with broadband characteristics.

In this article, a novel wideband circularly polarized (CP) square‐slot antenna with perturbation elements is proposed. The antenna comprises of an inverted L‐shaped feeding line, pairs of corner cuts, a rectangular slot, and a semi‐elliptical patch. The numerous CP resonant modes were excited simultaneously using these slots and patches as perturbation elements. To verify this concept, an antenna prototype was built and tested. The measured results indicate the −10‐dB impedance bandwidth (IBW) is 69.2% (2.42–4.98, 3.7 GHz) and 3‐dB axial ratio bandwidth (ARBW) is 59% (2.58–4.74, 3.66 GHz). Furthermore, the measured peak gain is 4.3 dBi, and the gain variation within the certain bandwidth is less than 1 dB. Therefore, the presented antenna features wide CPBW and stable gain characteristics. [ABSTRACT FROM AUTHOR]