Reflective metasurface for generating vortex wave in ultra-wideband

In this paper, a metasurface that can generate vortex electromagnetic wave in ultra-wideband is proposed. The metasurface was composed by arrow-shaped elements with different arm lengths in a proper order to covert a plane wave to vortex electromagnetic wave. The simulation results verifies that the reflected wave from the designed reflective metasurface is vortex wave in ultra-wideband from 18GHz to 42GHz, which is in good agreement with the theoretical analysis. The proposed reflective metasurface paves an effective way to generate vortex electromagnetic wave with arbitrary single-mode in ultra-wideband for microwave wireless communication applications.