Design of Circularly Polarized Antenna Loaded with Reflective Polarization Conversion Metasurface

In this paper, a circularly polarized microstrip antenna loaded with a polarization conversion metasurface(PCM) is presented , whose unit cell is composed of a double-head arrow-shaped metal film mounted on the single side of a FR-4 substrate. The radiating element of the antenna is a modified T-shaped metal patch. Simulated results indicate that with the proposed structure, the microstrip antenna can operate over a 10.7 GHz to 17 GHz range with a return loss less than -10 dB, while exhibit a 3-dB axial ratio bandwidth of 0.4 GHz from 11.4 GHz to 11.8 GHz and from 12.6 GHz to 13 GHz respectively. The gain across the circular polarization band ranges from 4.9 to 5.2 dB.