Metasurface cavity antenna for broadband high-gain circularly polarized radiation

The article presents a microstrip patch (MSA) fed high gain circularly polarized metasurface cavity (CP-MSC) antenna using a planar progressively-phased-reflector and a transmissive linear to circular polarization conversion metascreen. The bottom metasurface reflector consists of a remodeled Jerusalem cross to obtain 2 reflection phase variation. Linear to circular polarization conversion is achieved by a hexagonal ring based meta-element with high transmission and bellow 3 dB axial ratio from 9.5 to 10.5GHz. Simulated and measured results of assembled CP-MSC antenna with MSA are in good agreement. The gain of the proposed cavity antenna with 10 and 10.5GHz MSA are 14.9 and 16.3dBi, respectively. Below 3 dB AR throughout the operating band denotes significant circular polarization performance of the proposed antenna.