一种基于六边形环状结构的双阻带红外频率选择表面  

Infrared Frequency Selective Surface with Dual Stopband Based on Hexagonal Ring Structure

作　　者：孟真 田昌会[1] 黄思宁 范琦 杨百愚[1] 田晓霞[1] MENG Zhen;TIAN Changhui;HUANG Sining;FAN Qi;YANG Baiyu;TIAN Xiaoxia(Department of Basic Science,Air Force Engineering University,Xi'an 710051,China)

机构地区：[1]空军工程大学基础部,陕西西安710051

出　　处：《红外技术》2020年第6期528-533,共6页Infrared Technology

基　　金：陕西省自然科学基础研究计划资助项目(2019JZ-40)。

摘　　要：为实现中红外大气窗口(3~5μm)和远红外大气窗口(8~14μm)的低红外透过率,设计了一种双频红外频率选择表面(FSS),该FSS由两个外侧六边形内侧圆形的环状结构组成。CST电磁软件仿真结果表明,该FSS在中远红外两个大气窗口内的平均透过率低于5%,实现了中远红外的双阻带。采用表面电流分析法分析了该FSS的滤波机理,该结构通过屏内单元间的耦合形成对称电流模式,使散射场增强,透过率降低,形成了相应波段的阻带。仿真结果表明该结构具有极化稳定性,且对于不同入射角的TE波具有良好的角度稳定性,介质层厚度和损耗角正切值对传输特性影响较小,介电常数对其影响较大。To get low transmittance in mid-infrared atmospheric windows(3-5μm)and far-infrared atmospheric windows(8-14μm),we designed a double frequency infrared frequency selective surface(FSS).This FSS is composed of two ring structures–the outer side of the structure is a hexagon and inner side is a circle.The simulation results of CST electromagnetic software show that the average transmittance of the FSS in both mid and far infrared atmospheric windows is less than 5%;in addition,the two stopbands in infrared wavelengths are realized.The filtering mechanism of the frequency selective surface is analyzed based on the method of surface current model analysis.The structure forms a symmetrical current mode through the coupling between the unit in the screen,which enhances the scattering-field and decreases the transmission rate,forming a stopband in the corresponding band.The simulation results show that the structure has polarization stability and good angle stability for TE electromagnetic waves with different incident angles.In addition,the dielectric layer thickness and loss tangent have little effect on transmission properties,and dielectric constant has a great effect on transmission properties.

关 键 词：中远红外 大气窗口 频率选择表面 传输特性 

分 类 号：TN213[电子电信—物理电子学]