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Generation of OAM Vortex Wave Based on Digital Reflective Metasurface

In this paper, a digital reflective metasurface is proposed to generate vortex wave carrying orbital angular momentum (OAM) based on digital reflective metasurface. Compensating phase for generating OAM vortex wave is calculated using reflectarray theory and classified into two categories of 0 and 180 degree. Only two kinds of unit cells, denoted as ‘0’ and ‘1’, with simple structure constitute the reflective metasurface, which provide 0 and 180 degree reflection phase, respectively. The numerically simulated and experimentally measured results verify that the OAM vortex wave can be generated by using digital reflective metasurface. The proposed method evades the complexity and difficulty in designing the unit cells with extremely wide reflective phase range and is promising in reconfigurable OAM vortex wave generation.