A Novel Low Profile Broadband Circularly Polarized Patch Antenna

Abstract

A broadband circularly polarized (CP) antenna is designed in this letter. The antenna mainly consists of two parts, one is the driver patch, the other is the parasitic patch. By cutting the corner perturbation of the drive patch, CP radiation is generated. In order to further broaden the circular polarization bandwidth. Two pairs of parasitic patches are introduced, by changing the distance between patches, the two new Axial ratio (AR) minima poles are introduced, thereby broadening the circular polarization bandwidth. After the proposed antenna is finally optimized, its -10dB impedance bandwidth can reach 30.9%, and its 3dB AR bandwidth can reach 12.6%.