Design of an Optically Transparent Microwave Absorber Based on Coding Metasurface

• Published in: Symmetry (Basel) Vol. 14; no. 10; p. 2217
• Main Authors: Lai, Senfeng, Liu, Guiyang, Guo, Yanpei, Liu, Yang
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.10.2022
• Subjects: Absorbers (materials); Absorptance; Absorptivity; Algorithms; Coding; coding metasurface; Composite materials; Design; flexible and optically transparent; Indium tin oxides; Metamaterials; Metasurfaces; microwave absorber; Microwave absorbers; Particle swarm optimization; Permeability; Polyethylene terephthalate; Radar cross sections; Radiation; RCS reduction; Surface structure; Thin films
• ISSN: 2073-8994; 2073-8994
• DOI: 10.3390/sym14102217

In this paper, a metamaterial absorber with a checkerboard patterned ITO (indium tin oxide) film as the surface is obtained by using flexible and optically transparent wave-absorbing material ITO–PET (polyethylene terephthalate), and a coding arrangement of two basic coding units based on the APS-PSO (Array Pattern Synthesis -Particle Swarm Optimization) algorithm. The surface structure of the absorber consists of ITO rectangular patch structures and ITO circular patch structures (110 Ω/sq). The ITO rectangular patch structures and ITO circular patch structures are symmetrical. The middle layer is made up of two layers of PET and one layer of PMMA, and the bottom surface is covered with a layer of low square resistance ITO film (8 Ω/sq). The experimental results, which are consistent with the simulation results, show that the absorber has superior performance: over 90% absorptance in the 5.06–9.01 GHz band, high transmittance, and a −10 dBsm RCS (radar cross-section) reduction in the 5.3–8.7 GHz band. This design also has polarization insensitivity and angular stability.