基于超表面的钝二面角结构后向散射增强设计  

Backscattering enhancement of an obtuse dihedral corner structure through metasurface

作　　者：雷雪 邹义童 尚玉平 廖成[1] LEI Xue;ZOU Yitong;SHANG Yuping;LIAO Cheng(Institute of Electromagnetic Field and Microwave Technology,School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院电磁场与微波技术研究所

出　　处：《电子元件与材料》2019年第8期99-105,共7页Electronic Components And Materials

基　　金：国家自然科学基金(61601379,61771407);中央高校基本科研业务费资助项目(2682018CX41)

摘　　要：为了增强钝二面角结构在近掠入射条件下的后向雷达散射截面,提出了基于超表面加载的有效设计.通过对钝二面角结构的两个平面进行入射角与反射角分析,确定了超表面的加载区域与反射相位梯度.根据所计算的反射相位分布,获得了超表面的各单元尺寸.全波仿真结果表明,对于10 GHz设计频率,经过超表面双面加载的钝二面角结构,在phi极化与theta极化电磁波照射时后向雷达散射截面分别增强了16.5 dB与13.3 dB.进一步,对双站散射的分析验证了超表面加载对钝二面角结构反射方向的有效控制是后向雷达散射截面增强的重要基础.Effective designs based on metasurface loading were presented for enhancing backscattering cross-section of an obtuse dihedral corner structure at near-grazing incidence.The loading area and reflection phase gradient of the metasurface were determined by analyzing the incidence and reflection angles for two illuminated inner surfaces of the obtuse dihedral corner structure.Dimensions of unit cells of the metasurface were obtained according to the calculated reflection phase distribution.Full-wave simulation results indicate that backscattering cross-section at the operating frequency of 10 GHz can be augmented by 16.5 dB and 13.3 dB for the phipolarized and theta-polarized incident electromagnetic waves respectively by loading the obtuse corner structure with two metasurfaces on its both inner surfaces.Moreover,the analysis of bistatic scattering patterns demonstrates that effective manipulation of reflection direction of the obtuse dihedral corner structure through metasurface loading serves as the key basis of the backscattering cross-section enhancement.

关 键 词：超表面 二面角反射器 雷达散射截面 后向散射截面 方向回溯 多次反射 

分 类 号：O441.4[理学—电磁学]