A Wideband High Gain Circularly Polarized Metasurface Horn Antenna

The traditional circularly polarized (CP) horn antenna needs a polarization converter, enlarging the horn size. In this paper, a broadband high-gain CP horn antenna is designed by loading a linear-to-circular polarization (LP-to-CP) metasurface converter on the aperture of the standard linearly polarized (LP) horn. With the proposed metasurface lens, the size, weight, and cost of the CP horn are almost the same as those of the original LP horn. The simulation results show that the axial ratio bandwidth of the CP horn antenna is over 15.0% and the peak gain is 18.8 dBi.