Design and Analysis of Vortex Electromagnetic Wave Based on 1-Bit Coding Metasurface

In this paper, a 1-bit coding metasurface is adopted to generate vortex electromagnetic wave with the working frequency at 12.5 GHz. Firstly, the necessity and feasibility of the realizing of an OAM beam by using a 1-bit phase modulation element are introduced. Then, the full wave analysis methods for the generating of vortex beams with different phase modulation elements are established to verify the feasibility of OAM-generation. Next, the effects of some key parameters on OAM performance are summarized quantitatively, such as the peak gain and the divergence angle. Therefore, it provides a powerful research basis for the realization of vortex performance with adjustable function in future.