Low-profile Beam-control Antenna Based on Reconfigurable Transmissive Metasurface

A 1-bit reconfigurable transmissive metasurface antenna (RTMA) with beam scanning and multi-beam forming capabilities is designed in this paper. The RTMA consists of 121 electronically controllable elements and a microstrip patch feeding antenna. The profile of the RTMA is only 0.19λ
0
, which is significantly lower than other metasurface antennas (The λ
0
is the wavelength in free space at 5.47GHz). By integrating two p-i-n diodes, the proposed element achieves 180° phase difference. The simulation results show that the peak gain of the RTMA is 11.1dBi. The scanning angle ranges from -60° to +60° in E-plane with the gain fluctuation less than 0.6dBi. The RTMA has advantages of low-profile, low-cost and easy integration.