Gain Enhancement of Wideband Millimeter-Wave Circularly Polarized Antenna Based on FSS Superstrate

A millimeter-wave wideband circularly polarized antenna with an improved gain is designed in this paper. The gain enhancement of 5 dB at 35 GHz is achieved by loading the CP antenna with FSS superstrate. The simulation results show that the proposed antenna has a wide -10 dB impedance bandwidth of 58.2%, a 3-dB AR bandwidth of 35%, a 3-dB gain bandwidth of 30%, and a maximum gain of 11.9 dBic at 35 GHz.