High-temperature-resistant frequency selective metasurface with low-frequency diffusion and high-frequency transmission

Abstract

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.

Miniaturized frequency selective rasorber with absorption in S–C band and transmission in X band

“…The classic frequency selective surface (FSS) has been widely applied in the field of radio stealthy technology [2,3], such as the design of stealthy radome, which realizes the transmission function in the operating band of the radar antenna and the reflection function outside the operating band, and reduces the radar cross section by curved shape design [4]. However, in recent years, along with the development of advanced equipment such as ultra-broadband radar and multi-base radar and the constant breakthrough of high-sensitivity detection technology, the stealthy performance of traditional radome that rely on reflecting electromagnetic waves outside the band gradually expire [5,6]. Therefore, there is an urgency to research out-of-band absorption stealthy radome [7,8], which reduces the RCS of the radome by absorption based on shape stealth [9].…”