This paper presents a solution to the broadband monostatic and bistatic Radar Cross Section (RCS) reduction of a micrometer wave antenna operating at 3.8 THz without much deterioration in its radiation characteristics. A Frequency Selective Surface (FSS) is proposed which behaves as a linear polarization converter (PC), thus converting linearly polarized electromagnetic waves to cross-polarized waves over two frequency bands. The PC is constituted of a finite geometrical pattern made of copper etched on the top of a dielectric substrate made of polyimide and copper layer at the bottom. Broadband polarization conversion efficiency reaches over 90% for the range of 3.72–4 THz and 5.52–6.28 THz with resonances occurring at 3.84 THz and 5.92 THz at which 99.5% and 99.8% polarization conversion efficiency are acquired, respectively. A meticulous arrangement of PC cells around a planar microstrip antenna is reported for maximum RCS reduction of co-polarized waves from 1 to 10 THz.

本文提出了一种解决方案，以减少工作在 3.8 THz 的微米波天线的宽带单基地和双基地雷达横截面 (RCS)，而其辐射特性不会有太大恶化。提出了一种频率选择表面 (FSS)，它充当线性极化转换器 (PC)，从而在两个频带上将线性极化电磁波转换为交叉极化波。PC由蚀刻在由聚酰亚胺制成的介电基板的顶部和底部的铜层上的铜制成的有限几何图案构成。宽带偏振转换效率在 3.72-4 THz 和 5.52-6.28 THz 范围内达到 90% 以上，共振发生在 3.84 THz 和 5.92 THz，分别获得 99.5% 和 99.8% 的偏振转换效率。