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频率选择表面(Frequency Selective Surface,FSS)隐身天线罩是天线罩发展的新阶段,但仍存在无法“带内隐身”的缺陷。性能可重构的有源频选(Active FSS,AFSS)可通过外加偏置人工调节其滤波性能,通过“时域隐身”实现天线罩在全频段的隐身,为未来隐身提供新思路。本文基于Altair FEKO软件,首先设计了一款工作于C波段且具备良好滤波性能的AFSS,其在关闭状态下保持带通特性,而在打开状态下切换为屏蔽特性。对应于AFSS的透明与不透明两个状态,分别对内部含天线的介质天线罩和金属天线罩的后向单站RCS进行仿真对比,通过结果分析可知,AFSS能使天线罩带内的天线强镜面反射RCS至少降低10d B,且在±60度入射角范围的单站RCS都保持在较低的水平,均低于-10d B。
Frequency Selective Surface (FSS) Stealth radome is a new phase of radome development, but there are still some defects that can not be “in-band stealth ”. Active FSS (AFSS) can adjust its filtering performance manually by applying bias and “stealth” to realize the stealth of the radome in all frequency bands, providing new ideas for future stealth. Based on Altair FEKO software, this paper first designs an AFSS with good filtering performance in C-band, which maintains the band-pass characteristic in the off state and switches to the shielding characteristic in the open state. Corresponding to the AFSS transparent and opaque two states, respectively, the internal antenna with a radome and metal radome backward single-station RCS simulation comparison, the results show that AFSS can radome antenna within the strong mirror The reflected RCS is reduced by at least 10d B, and the single station RCS at the angle of incidence of ± 60 degrees is kept at a lower level, both lower than -10d B.