Flexible and Transparent Broadband Absorber Based on Gridded ITO Ground

To address the limitations of current microwave absorbers in terms of conformity and Optical opaqueness, this paper 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.