High-Gain Low-Sidelobe Transmitarray Antennas

This paper proposes high-gain low sidelobe Trans-mitarray antenna (TA) designs. The metasurface elements with 3-bit amplitude and phase control are first proposed. Two TAs are then designed based on the methods of phase compensation only and the control of both phase and amplitude respectively. Simulations demonstrate that the two TAs achieve peak gains of 22.1 dBi and 21.4 dBi respectively, and side-lobe levels (SLLs) of -22.7 dB and -28 dB respectively. The SLL of the TA is successfully reduced by controlling the amplitude distribution on the transmitarray at a cost of the slight gain reduction.