X-Band Circularly Polarized Transmitarray with Linearly Polarized Feed Source

This paper proposes a receive-transmit broadband circularly polarized transmitarray antenna .The unit is composed of three metal layers sandwiching two dielectric substrates, with the middle layer functioning as a grounded plane with a center hole. The top and bottom metal patches are connected using metallic via. The proposed unit converts the transmitted y-polarized wave into a left-handed circular polarized (LHCP) wave through a linear-circular polarization conversion metasurface. The simulation of a 256-unit transmitarray is conducted, revealing that the transmitarray achieves a 1-dB gain bandwidth of 17.1% (10GHz-11.85GHz) and a 3-dB axial ratio (AR) bandwidth of 31.3% (9.22GHz-12.60GHz). The peak gain at 10.8Ghz is simulated to be 23.68dBi, with an aperture efficiency of 46%.