中文摘要：

基于有限元法设计了一种金膜圆环周期结构频率选择表面,仿真结果表明该周期结构在远红外大气窗口（8-14 μm）对红外辐射抑制效果明显,在25-37.5 THz （8-12 μm） 平均透过率低于20%,尤其是在27-36 THz之间其透过率低于10%。通过优化计算,研究了圆环内外半径、宽度和厚度等不同结构参数对该结构传输特性的影响规律。

英文摘要：

A periodic structure frequency selective surface with gold film circular ring was designed base on finite element method. Simulation results show that the periodic structure has a obvious effect on infrared radiation suppression in far infrared atmospheric window （8-14 μm）. The average transmittance is below 20% within 25-37.5 THz （8-12 μm）,especially it is less than 10% within 27-36 THz. Influence rules of different structure parameters on the transmission characteristics are analyzed by optimizing calculation,such as radius,width and thickness of circular ring.