基于六边形环状结构的远红外频率选择表面
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摘要
为实现远红外大气窗口(8~14?m)的低红外透过率,基于六边形环状结构设计了双屏远红外频率选择表面(FSS)。仿真结果表明,该结构在8~14?m波段的平均透过率低于5%。对该结构的表面电流分析说明,谐振单元表面感应出的对称分布电流以及双屏结构之间的耦合效应使得散射场增强,透过率降低。研究了该结构在不同入射角和不同极化条件下的传输特性,结果表明该结构在8~14?m具有良好的角度稳定性和极化稳定性。分析了介质层介电常数、厚度以及损耗角正切对该FSS传输特性的影响,结果表明介质层介电常数对FSS的谐振频率和带宽有较大影响。
In order to get a low transmission rate in the far-infrared atmospheric window(8-14 ?m), a double layer far-infrared frequency selective surface(FSS) based on a hexagonal loop structure is designed. Simulation results show that the average transmission is lower than 5% and within 8-14 ?m. As per the surface current analysis of the periodic structure, the symmetrically inducted current of the resonant unit and the coupling effect between the double layer structure enhance the scattering field and decrease the transmission rate. In this paper, the transmission properties of the structures under different incident angles and polarizations are studied. The results show that the structure has good angle stability and polarization stability. The effect of the dielectric layer's properties(thickness, dielectric constant, and loss tangent) on the transmission of FSS is analyzed. The results indicate that the dielectric constant significantly affects the resonant frequency and bandwidth of the structure.
In order to get a low transmission rate in the far-infrared atmospheric window(8-14 ?m), a double layer far-infrared frequency selective surface(FSS) based on a hexagonal loop structure is designed. Simulation results show that the average transmission is lower than 5% and within 8-14 ?m. As per the surface current analysis of the periodic structure, the symmetrically inducted current of the resonant unit and the coupling effect between the double layer structure enhance the scattering field and decrease the transmission rate. In this paper, the transmission properties of the structures under different incident angles and polarizations are studied. The results show that the structure has good angle stability and polarization stability. The effect of the dielectric layer's properties(thickness, dielectric constant, and loss tangent) on the transmission of FSS is analyzed. The results indicate that the dielectric constant significantly affects the resonant frequency and bandwidth of the structure.
引文
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[2]冯炽焘.红外制导技术发展综述[J].红外技术,1994,16(3):1-9.FENG Chitao.A review on the development of IR guidance techniques[J].Infrared Technology,1994,16(3):1-9.
[3]叶本志,蔡希昌,邱娜,等.红外制导技术的发展[J].红外与激光工程,2007,36(z2):39-42.YE Zhiben,CAI Xichang,QIU Na,et al.Development of the infrared guidance technology[J].Infrared and Laser Engineering,2007,36(z2):39-42.
[4]Munk B A.Frequency Selective Surface:Theory and Design[M].New York:wiley,2000.
[5]李小秋,高劲松,冯晓国.一种新型复合单元频率选择表面[J].微波学报,2008,24(1):7-14.LI Xiaoqiu,GAO Jingsong,FENG Xiaoguo.A novel composite element frequency selective surface[J].Journal of Microwaves,2008,24(1):7-14.
[6]李小秋,冯晓国,高劲松.双屏频率选择表面传输特性的研究[J].微波学报,2009,25(5):16-18.LI Xiaoqiu,FENG Xiaoguo,GAO Jingsong.Research on transmission characteristics of double screen frequency selective surfaces[J].Journal of Microwaves,2009,25(5):16-18.
[7]HUANG J,WU T K,LEE S W.Tri-band frequency selective surfaces with circular ring elements[J].IEEE Transactions on Antennas and Propagation,1994,42(2):166-175.
[8]穆鑫,王斌科,田昌会,等.周期性结构对远红外辐射特性抑制和分析[J].激光与红外,2016,46(9):1091-1095.MU Xin,WANG Binke,TIAN Changhui,et al.Suppression analysis of periodic structure on radiation characteristics in far infrared[J].Laser and Infrared,2016,46(9):1091-1095.
[9]郑麟,屈绍波,闫明宝,等.基于LC耦合机制调谐设计薄屏宽带频率选择表面[J].微波学报,2016,32(3):1-5.ZHENG Lin,Qu Shaobo,YAN Mingban,et al.Design broadband-pass frequency selective surface utilizing a thin substrate based on LC couplings[J].Journal of Microwaves,2016,32(3):1-5.
[10]杨泽波.频率选择表面的设计与仿真计算[D].长沙:中南大学,2014.YANG Zebo.Design and Simulation of Frequency Selective Surface[D].Changsha:Central South University,2014.
[11]田蒔.材料物理性能[M].北京:北京航空航天大学出版社,2006.TIAN Shi.Material Physical Properties[M].Beijing:Beihang University Press,2014.
[12]吴禄军.周期性结构单元的结构及物理参数对频响特性的影响[D].北京:北京工业大学,2013.WU Lujun.Effect of the structure and physical and physical parameters on the frequency periodic structural unit[D].Beijing:Beijing University of Technology,2013.