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Generation of Tilted High-Order Bessel Beam in Millimeter Range Using Metasurface

Metasurface is robust in manipulating features of electromagnetic waves by properly designed subwavelength unit cells. Bessel beams and orbital angular momentum (OAM) beams have been investigated extensively for a bunch of applications. High-order Bessel beams that inherently carry OAM may benefit long-distance high-capacity wireless communications. This work presents a metasurface-based generator for a tilted Bessel beam of order 5 operating in millimeter wave region. Unit cells of the metasurface is designed to provide different phase shifts. Phase engineering approach is applied to design the metasurface. The entire metasurface plate is the superposition of four functions and corresponding four sets of phase shifts are combined together to give the final phase distribution of the metasurface. Simulation results apparently prove the reliable generation of the tilted high-order Bessel beam by showing correct amplitude and phase profiles. This work is meaningful for generating novel multifunctional beams utilizing metasurface.