High-efficiency Orbital Angular Momentum Multiplexing Transmission for Spatial Diversity Incident Electromagnetic Wave
Orbital angular momentum(OAM)multiplexing of electromagnetic(EM)wave is of great significance for high-speed wireless communication.To achieve high-efficient OAM multiplexing for spatial diversity incident EM wave,in this paper a novel asymmetric meta-atom structure is presented,which can introduce the required angular dispersion phase response as well as high transmission efficiency for OAM multiplexing at different incidence angles.These meta-atoms are then arranged accordingly to form a metasurface working at X band,whose OAM multiplexing performance with l=±2 modes under±45° incidence are demon-strated by simulation and experiment results.Compared to the conventional OAM multiplexing metasurfaces,the proposed metasur-face can convert higher proportion of energy to the required OAM modes without parasitic OAM beams towards other directions,which can significantly improve the OAM multiplexing efficiency for spatial diversity incident EM wave.
orbital angular momentummetasurfaceangular dispersionmultiplexingspatial diversity
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