Beam Reconfigurable Antenna Based on Liquid Crystal Metasurface

A novel design method of electronically controlled beam reconfigurable antenna using liquid crystal metasurface is presented in this paper. The metasurface is a two-dimensional plane composed of a series of sub-wavelength liquid crystal unit cells. The beam in desired radiation direction can be achieved by varying the impedance distribution of liquid crystal metasurface according to microwave holographic technique. In the simulation, we can obtain an arbitrary radiation direction beam within the zenith angle range of 35°∼60° at 39 GHz, and the maximum gain reaches 10.65 dB. Such a beam reconfigurable antenna with low profile ($44\ \mathbf{mm}\ast 44\ \mathbf{mm}\ast 2.15\ \mathbf{mm}$) and continuously adjustable beam has great value in practical applications of mobile communications.