DOI: 10.1109/TMTT.2025.3526833   IEEEXplore: https://ieeexplore.ieee.org/document/10843852    

Optically transparent metasurface with low IR emissivity, radar camouflage and mm-Wave transmission.

7.6 – 16.4 GHz (absorption), 25.4 – 30.9 GHz (transmission)

A bilayer of indium tin oxide (ITO) structures with a layer of square patches in a quartz substrate to provide optical transparency and low IR emissivity sit above a layer of narrow rings for inductive radar absorption. A metal mesh frequency selective surface (FSS) structure of a copper grid is fabricated by a flexible printed circuit (FPC) process for optical transparency and mm-Wave transmission.

EM shielding optical windows, radomes, and mm-Wave communication systems

51% optical transparency from 400 to 800 nm; 0.363 IR emissivity from 8 to 14 µm and 0.304 from 3 to 5 µm; 90% radar absorption from 7.6 to 16.4 GHz; 0.96 dB insertion loss at 27.9 GHz.