周期性结构对远红外辐射特性抑制分析

摘要

A periodic structure frequency selective surface with gold film circular ring was designed base on finite ele-ment 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.%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（8～14μm）对红外辐射抑制效果明显，在25～37.5 THz （8～12μm）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。