Multi-layer composite structure covered polytetrafluoroethylene for visible-infrared-radar spectral Compatibility

In this paper, a polytetrafluoroethylene (PTFE) top-covered multi-layer composite structure PTFE/ H s /(Ge/ZnS) 3 ( H s represents the surface layer ZnS with various thicknesses) for spectral compatibility is proposed and investigated theoretically and experimentally. A substantial decline of glossiness from over 200 Gs to 74.2 Gs could be realized, due to high roughness and interface reflection of the 800 nm PTFE protection layer. In addition, similar to the structure of H s /(Ge/ZnS) 3 , the designed structure with a certain color exhibits ultra-low emissivity of average 0.196 at 8–14 µ m and highly transparent performance of 96.45% in the radar frequency range of 2–18 GHz. Our design will provide an important reference for the practical applications of the spectral compatible multilayer films.