Flexible and Transparent Broadband Absorber Based on Gridded ITO Ground
Senfeng Lai, Yang Liu, Jingyi Luo
Abstract
To address the limitations of current microwave absorbers in terms of conformity and Optical opaqueness, this letter proposed a flexible and transparent broadband absorber based on gridded indium tin oxide (ITO) ground. The absorber adopts a classical sandwich structure and is made of optically transparent materials. By etching the ground into a grid pattern, a transparency of 74.04% was achieved. The equivalent circuit model and the distribution of surface-induced electric and magnetic fields are used to analyze the working mechanism. The absorber achieves over 90% absorption in the 19.9-44.6 GHz frequency range, and its resonant pattern is symmetric, making it polarization-insensitive. The thickness of the absorber is only 1.35 mm, making it particularly suitable for military applications such as warships and electronic devices that require electromagnetic absorption, optical transparency, and flexibility.