An FSS-backed reflective polarization conversion meta-surface for radar stealth

Abstract

In this paper, a new technique is proposed for designing stealthy radome, especially for normal incoming wave stealth. The proposed structure is composed of a band-pass FSS and one layer of polarization conversion arrays which are separated by a foam layer. An FSS-backed polarization conversion meta-surface (PCM) can be obtained. The FSS-backed PCM is capable of providing a second-order transmission window and a wide stealthy band. In the transmission window (4.2∼4.6 GHz), the self-excited communicate electromagnetic wave can pass through freely with its same polarization state. In its stealthy band (7.0∼17.6 GHz), the external incoming wave can be efficiently reflected with its cross-polarized state. Thus, the radome is invisible for a linearly-polarized radar system even the detecting wave is reflected along its incoming direction. The proposed PCM is simulated and experimented. The measured results are in good agreement with the simulated ones. This stealth technique will be significance in the area of naval vessel radomes.