A Novel Dual-Beam High Gain Beam Scanning Fabry-Perot Cavity Antenna Based on Bidirectional Asymmetric Transmission Metasurface

A dual-beam high-gain wide-band beam-scanning Fabry-Perot-Cavity-Antenna (FPCA) is proposed in this article. By configuring a single reflection-mode (R-mode) FP cavity with two external feed antennas operating at the same frequency band, the proposed antenna can simultaneously generate two high-gain beams with different steering angles. The beam scanning angle of the two beams is equal to the excitation angle of the feed antenna to the R-mode FP cavity. The two high-gain beams of the antenna can be deflected independently by changing the irradiation angle of the two feeds to the R-mode FPC independently. The proposed dual-beam antenna consists of a Janus PRS which is constructed by a bidirectional asymmetric transmission metasurface, a metal ground, and two external feed antennas. For a demonstration, we analyze the beam scanning performance of the proposed dualbeam R-mode FPCA in four different planes in 3-D space. The simulation results indicate that the proposed antenna can realize a beam scanning angle of 30° for each beam. The deflected beams in the four scanning cases all behave as high-gain pencil beams. The proposed dual-beam R-mode beam-scanning FPCA can be potentially applied in the 5G communication systems to enhance the communication capacity and spectrum utilization efficiency.