This paper presents a high-temperature-resistant frequency selective metasurface with wide-band low-backward scattering at lower frequencies and wide-band efficient transmission at higher frequencies. According to functions, it consists of three functional layers: a lagging made of low-loss insulation tile, a diffusive metasurface, and a frequency selective surface. The diffusion metasurface is comprised of special arranged various square rings, where meander lines are integrated ensuring transmission at higher frequencies. Separated by a piece of honeycomb paper, a triple-layer coupled-resonator spatial filter frequency selective surface is placed below the diffusive metasurface. Based on the phase cancellation technique and dual-resonance transmission, 10 dB reduction of radar cross-section (RCS) is achieved from 2.45 GHz to 11.55 GHz, and a wide-band transmission lower than 1 dB is obtained in 17.33–19.08 GHz. In addition, a standard thermal test and subsequent electromagnetic test show that our sample maintains good performance after being heated at 500 ℃ for 5 s. This work opens a new route of designing frequency-selective metasurfaces with high-temperature resistance.
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