Transparent and temperature-stable ultra-broadband metamaterial absorber based on FTO glass

In this paper, a transparent and temperature-stable ultra-broadband metamaterial absorber with wide-angle insensitivity based on fluorine-doped tin oxide (FTO)-coated glass is presented. This absorber features an FTO-AIR-FTO sandwich structure, achieving over 90% absorption in the range of 3.4-10.6 GHz, with a fractional bandwidth of 103% and a relative thickness of 0.08λ_L. Moreover, due to the high optical transparency and favorable temperature resistance of FTO glass, it has been experimentally verified that the absorber exhibits 71.7% transparency in the visible region and maintains stable wideband absorption at 200°C. This absorber has vast application potential in transparent and high-temperature scenarios for microwave absorption, electromagnetic protection, and camouflage deception.