Multidimensional Manipulation of Circular Polarization Airy Beam in Microwave Band‐Based on an Anisotropic Holographic Impedance Metasurface

Abstract

Non‐diffraction Airy beams with self‐accelerating properties have many potential applications in the microwave band, such as providing a viable solution to bypass obstacles for microwave‐based wireless power transfer (WPT) and communication. However, most of the recent work on Airy beams exhibits singular functionality and operates solely in linear polarization, with complex generation setups, which will constrain the applications of the beam in the microwave band. In this paper, based on the anisotropic holographic impedance metasurface (AHIM) with low complexity, a new method is proposed to manipulate Airy beams in multiple dimensions, including circularly polarization state, number of beams, direction of acceleration, and launch position of beam. The underlying principle is the combination of plane coordinate transformation, anisotropy of AHIM, and impedance superposition theory. Further, to validate the proposed method, an AHIM prototype for simultaneously generating two Airy beams with orthogonal circular polarization, different directions of acceleration, and different spatial distribution is designed, simulated, and measured. The proposed method based on AHIM for manipulating the Airy beams multidimensionally in the microwave band offers an efficient strategy to control the energy coverage and polarization state of the beam in different WPT scenarios.