A High-Gain Dual Circularly-Polarized Antenna based on Metasurface Polarizer

This paper proposes a high-gain dual circularly-polarized (CP) antenna with a structure easy to process and a simple design principle. The design strategy is based on the incorporation of a high-gain dual linearly-polarized (LP) antenna with a transmissive linear-to-circular polarization (LP-CP) metasurface converter. A prototype has been developed at 12-13 GHz to give a demonstration of the design strategy, which shows 3-dB axial-ratio bandwidths of more than 12%, peak gains of more than 12.7 dBi and a high polarization isolation of more than 25 dB.