双层错位频率选择表面的电磁特性分析  

Analysis of electromagnetic characteristics of dual-layer frequency selective surface with screens aligning error

作　　者：马鑫[1] 万国宾[1] 万伟[1] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710129

出　　处：《电波科学学报》2013年第1期68-73,96,共7页Chinese Journal of Radio Science

基　　金：西北工业大学博士创新基金(No.CX201115);航空科学基金资助项目(No.20101853019)

摘　　要：针对双层频率选择表面(FSS)在曲面应用中容易出现单元错位问题,基于耦合积分方程建立错位FSS结构的理论分析模型,分析了双层错位FSS的电磁特性.采用谱域矩量法并结合周期性边界条件,将各层单元表面电流的计算范围限定在一个周期内;对于错位层FSS单元被周期边界截断的情况,考虑了周期边界上导体表面电流的连续性;选用RWG(Rao-Wilton-Glisson)基函数描述导体表面的感应电流,以实现对任意形状FSS单元的数值计算.以方环形贴片单元为例验证了算法的准确性,并考察了周期边界的电流连续性对FSS电磁特性的影响,分析了层间距、入射极化方向和错位量等参数对错位FSS结构散射特性的影响.In view of the appearance of aligning error for dual-layer frequency selec- tive surface （FSS） in the practical application of curved surface, based on the cou- pled integral equations, the theoretical model of dual layer FSS with screens alig- ning error is proposed and the electromagnetic characteristics are analyzed. Combi- ning with the periodic boundary condition, the calculating regions of each layer are reduced to one unite cell by spectral method of moment （MoM）. The continuity of the induced current on the periodic boundary of conductor is considered for the FSS cell aligning error. The current distribution is predicted by Rao-Wilton Glisson （RWG） basis functions which are applicable for arbitrarily shape elements. Taking square-loop FSS as an example, the accuracy of proposed method is verified and the effect of the boundary current continuity on the FSS electromagnetic characteristics is researched. The effects of the distance between two layers, the incident polariza- tion direction and the misalignment error on the scattering characteristics of dual- layer FSS are investigated.

关 键 词：错位误差 频率选择表面 耦合积分方程 谱域矩量法 电磁特性 

分 类 号：TN957.8[电子电信—信号与信息处理]