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In this paper, a reflectarray is designed to generate an orbital angular momentum (OAM) vortex wave at 0.1THz. The elements of circular patch with different radii are introduced to design the reflectarray producing an OAM wave. The simulation results implied that the OAM wave can be effectively generated by reflectarrays in THz band. The proposed method may provide a new way to generate the OAM vortex...
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