Designing Transmissive Metasurface for Multibeam Transmitarray at 5G Millimeter-Wave Band

In this paper, a frequency-multiplexed spin-decoupled transmissive metasurface is proposed by employing shared-aperture meta-atoms made of interleaved dual-band receiver-transmitter structures. As an application, a low-profile dual-band dual-CP shared-aperture transmitarray (TA) with four degrees of freedom for beamforming is designed in the 5G new radio millimeter-wave band. Simulated results show overall peak aperture efficiencies of 38.3% and 22.1%, simultaneously with joint gain variation < 3 dB and axial ratio < 3 dB relative bandwidths of two orthogonal CP beams better than 18.8% and 7.4%, for the low- and high-frequency bands, respectively. These features of the proposed TA make it a suitable candidate for 5G wireless and space communications.