Fabry-Perot resonant cavity vortex electromagnetic wave antenna based on metasurface

The invention belongs to the field of vortex electromagnetic wave antennas, and particularly provides a metasurface-based Fabry-Perot resonant cavity vortex electromagnetic wave antenna, which is used for solving the problems of relatively low vortex electromagnetic wave gain and complex feed mode. According to the invention, a metasurface capable of independently controlling transmission and reflection amplitudes and phases is designed as a partial reflection surface of the Fabry-Perot resonant cavity antenna, and corresponding phase compensation is carried out on transmitted high-gain plane electromagnetic waves, so that high-gain vortex electromagnetic waves with the mode number of + 1 or-1 are generated; moreover, the antenna has the characteristics of low profile, simple structure and simple feed, large-scale array formation can be realized by adopting a PCB (Printed Circuit Board) processing technology, the processing difficulty is low, and the cost is relatively low; finally, the metasurface-based Fabr