Omnidirectional Radiation Lens Design of Vortex Beam Carrying Orbital Angular Momentum Based on Spatial Transformation

摘要

Vortex beams carrying orbital angular momentum suffers from their divergence characteristics To convert the directional beam to an all-directional one, a transformation electromagnetics based lens is proposed for a potential all-dielectric realization. Employed above a microstrip patch antenna circular array, the emitted beam is steered to the direction parallel to the ground plane. The functionality of the proposed lens is numerically validated. Simulations results of both near-field distribution and far-field patterns demonstrate the omnidirectional radiation in the horizontal plane.