Broadband circularly polarized Fabry-Perot antenna utilizing Archimedean spiral radiator and multi-layer partially reflecting surface

This article presents a method to design broadband circularly polarized (CP) Fabry-Perot Resonator (FPR) antenna. The proposed antenna is based on multi-layer thin dielectric slabs arranged in close proximity as a partially reflecting surface (PRS) and an Archimedean spiral as a CP radiating source. Experimental results show a broadband operation from 6 to 13GHz, in which the reflection coefficient is less than -10 dB and the axial ratio (AR) is lower than 3 dB. In addition, good radiation patterns and high broadside gain of better than 10.8 dBic are achieved over the operating bandwidth. The proposed antenna can be used for C- and X-band satellite communications.