Simultaneous Generation of Linear- and Circular-Polarization Vortex Based on Symmetrical Metallic Quasi-Metasurface

Through comprehensive research on the working principles of the generalized Snell’s law, this paper presents a quasi-metasurface based on the theory of wavefront difference. The proposed structure successfully demonstrates the vortex manipulation of both linearly polarized waves and circularly polarized waves. The symmetrical metallic column design modulates the phase of one period at 18 GHz with a reflection loss of less than −0.5 dB. By decomposing circularly polarized waves into a set of mutually orthogonal linearly polarized waves with a phase difference of π/2, a simple synthesis method is proposed to convert existing linearly polarized waves into circularly polarized waves, thereby demonstrating vortex wave effects. The quasi-metasurface exhibits excellent performance, and the vortex characteristics of both linearly and circularly polarized waves are verified through simulations.