双层频率选择表面电磁特性数值模拟研究  

Numerical simulation for electromagnetic characteristics of double-layer frequency selective surfaces

作　　者：武振波[1] 武哲[1] 吕明云[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《电波科学学报》2004年第6期663-668,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金重大研究计划资助项目 (90 30 5 0 2 6 )

摘　　要：给出了一种分析有介质加载的不同栅格外形双层频率选择表面电磁特性的数值模拟方法。介质分离区内前向波和反向波分别关于相应的频率选择表面是周期的 ,确定了矢量传输及衰减模的表述形式。应用电磁场边界条件获得不同Floquet模系数的矩阵表达式 ,推导出一组耦合的积分方程 ,利用矩量法求解得到结构的电磁散射特性。模拟结果表明 ,由于层间介质内电磁场衰减模的耦合 ,双层FSS结构的电磁传输特性较单层有很大的改善。A numerical simulation approach analyzing electromagnetic characteristics for dielectric-loaded double-layer frequency selective surface (FSS) with dissimilar lattice geometries is presented. Firstly, the forward and reverse waves are periodic with corresponding FSS respectively, and an explicit description of the vectorial propagating as well as of the evanescent modes is provided. Then by applying the electromagnetic field boundary conditions, matrix formulae of different Floquet mode coefficients are obtained, and a group of coupled integral equations is derived. The electromagnetic properties can be obtained by using the method of moments. The results illustrate that, as compared with single screen structure, the electromagnetic transmission properties of double-layer one have great improvements because of the coupling of evanescent modes within the dielectric region.

关 键 词：频率选择表面 电磁散射 耦合积分方程 矩量法 

分 类 号：TN957.8[电子电信—信号与信息处理]