A Novel Method for Circularly Polarized Fabry-Perot Cavity Antenna

A receiver- transmitter metasurface for circularly polarized Fabry-Perot cavity antenna is presented in this paper. The adopted receiver-transmitter unit cell is designed to present high reflectivity to obtain high gain of the antenna. Then 2×2 sub-array is formed by four original receiver-transmitter unit cells. After parameter optimization, the sub-array has equal transmission magnitudes with 90° phase difference for two different polarized waves. So the linear to circular polarization conversion is realized. Using the proposed metasurface and a 45° tilted slot coupled patch antenna, a circularly polarized Fabry-Perot cavity antenna is formed. The simulated results show that the proposed antenna presents good circular polarization performance in the band of 9.76-10.2 GHz with the maximum realized gain of 17.5 dBic. The AR of the antenna is lower than 3 dB in the operating band. The proposed antenna outperforms most of circularly polarized antennas for its high gain and low profile properties.