一种双阻带红外频率选择表面  

An Infrared Frequency Selective Surface with Dual Stopband

作　　者：车志新[1] 田昌会[1] 王斌科[1] 杨百愚[1] 张海防[1] 陈晓莉[1] 田晓霞[1] CHE Zhixin;TIAN Changhui;WANG Binke;YANG Baiyu;ZHANG Haifang;CHEN Xiaoli;TIAN Xiaoxia(Science College, Air Force Engineering University, Xi'an 710051, China)

机构地区：[1]空军工程大学理学院,陕西西安710051

出　　处：《红外技术》2017年第7期594-598,共5页Infrared Technology

基　　金：国家自然科学基金资助项目(21471159);陕西省自然科学基金项目(2015JM2042)

摘　　要：为实现中、远红外大气窗口的双波段低红外透过率,设计了由2层不同尺寸圆环单元构成的双屏红外频率选择表面(FSS),仿真结果表明该FSS在3~5?m和8~12?m波段形成两个平均透过率低于5%的阻带。对FSS表面电流分析的结果说明,谐振单元表面感应出的对称分布电流使散射总场增强,形成增强型反射,而不同尺寸的谐振单元具有不同的谐振波长,两层谐振单元共同作用形成了两个阻带。研究了入射角以及介质层属性(厚度、介电常数和损耗角正切)对FSS传输特性的影响,结果表明FSS在两个大气窗口内具有良好的角度稳定性,介质层介电常数对FSS的传输特性有较大影响。In order to get the low transmission rate in both far infrared atmospheric window and mid infrared atmospheric window,an infrared frequency selective surface(FSS)composed of two layers of ring units with different sizes is designed.Simulation results show that the FSS has two stopbands in both3μm-5μm and8μm-12μm,of which the average transmission is lower than5%.According to the analytical results for the surface current of FSS,inducted current on the surface of units is symmetrical,which enhance the total scattering-field and lead to the enhanced reflex.While resonant units with different size have different resonant wavelength,two layers of units cooperatively form two stopbands.The paper analyzes the effect of the incident angle and dielectric layer properties(thickness,dielectric constant and loss tangent)on the transmission properties of FSS.The results revealed that the transmission of FSS is insensitive to the incident angle,while the dielectric constant is an important factor to the transmission.

关 键 词：频率选择表面 双屏结构 大气窗口 传输特性 

分 类 号：TN213[电子电信—物理电子学]