A metasurface capable of simultaneous stealth across multiple electromagnetic wave bands and its design concept

Abstract

The investigation of metasurfaces presents an innovative method for attaining multi-band electromagnetic wave concealment. Presently, there exist two primary categories of multi-band stealth metasurfaces : those suitable for infrared and microwave frequencies and those appropriate for terahertz and microwave frequencies . Nonetheless, investigations into metasurfaces that concurrently offer stealth across the infrared, microwave, and terahertz spectra remain insufficient. This article presents a stealth metasurface suitable for infrared, microwave, and terahertz frequencies. The compatible stealth metasurface (CSM) may attain over 90 % cross-band absorption throughout the frequency ranges of 17.1 GHz–20.8 GHz and 2.04 THz-2.89 THz while exhibiting a low infrared emissivity (IE) of 0.46. This CSM uses the gradient principle to make absorption units of different sizes on its surface. To achieve cross-band absorption, it also uses a frequency-selective surface (FSS) as the reflecting layer, which is a first. Furthermore, the CSM's exterior is coated with low-IE materials, facilitating infrared stealth capabilities. The CSM's stealth properties across three electromagnetic wave bands make it very useful for military purposes, and the new way that FSS is used as a reflecting layer opens up a whole new way to make stealth metasurfaces that work with each other.