Study on Electromagnetic Scattering Characteristics of Inductively Coupled Plasma Superimposed Controllable Coding Diffuse Metasurface

Abstract

Aiming at the problem of poor attenuation of electromagnetic (EM) waves by thin-layer plasma, a composite absorbing structure of inductively coupled plasma superimposed controllable coding diffuse metasurface (ICP-CCDM) is designed in this article. First, the algorithm of successful history-based differential evolution variants with linear population size reduction (L-SHADE) is used to optimize the coding layout of subunits of the metasurface, so that a uniform diffuse effect in space can be achieved. Then, based on the convolution theory, the optimized coding layout and the coding layout distributed on the chessboard are superimposed to realize the deflection of the diffuse beam, thus increasing the propagation distance of the reflected EM wave in the ICP. Finally, the full wave simulation model of ICP-CCDM is built by CST, and its EM scattering characteristics are analyzed and verified by experimental measurements. The simulation and experimental results show that the CCDM can effectively broaden the radar cross section (RCS) reduction bandwidth of thin-layer ICP near the designed frequency (12 GHz), and improve the attenuation effect of thin-layer ICP on EM wave. Additionally, by controlling the RF power and the pressure of the ICP source, the active adjustable attenuation effect of ICP-CCDM on the EM wave is realized.