基于有源超表面的导电板雷达截面增强捷变设计  

Agile design of cross-section enhancement of a conducting plate radar through active metasurface

作　　者：王思豪 廖成[1] 尚玉平 张润午 Wang Sihao;Liao Cheng;Shang Yuping;Zhang Runwu(Institute of Electromagnetic Field and Microwave Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电磁场与微波技术研究所,成都610031

出　　处：《强激光与粒子束》2021年第4期22-28,共7页High Power Laser and Particle Beams

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

摘　　要：提出了一种使用散射方向图的动态可重构以实现雷达散射截面增强的捷变设计方法。结合变容二极管加载,使用具有嵌入式偏置回路的物理单元,所提出的有源超表面可以在具有梯度电压的外加直流偏置下,对平面电磁波的正入射或斜入射产生可电调的反射系数相位分布,以达到对反射波角度的灵活重定向,进而有助于单站或双站雷达散射截面增强的捷变效果。以导电平板为例,对三种不同的入射反射场景进行了计算与全波仿真,在设计频率10 GHz处,所提出的设计产生了可重构的散射方向图,表明了该设计对反射波角度的实时控制,并结合实验测量验证了单站与双站雷达散射截面的有效增强结果。The design concept of employing the dynamically reconfigurable scattering pattern to enhance radar cross-section is proposed and examined.In combination with varactor loading,a physical unit cell geometry with an embedded bias network for the varactors is utilized to build the metasurface.Biased by an applied direct-current source with voltage gradient,the proposed active metasurface can exhibit electrically tunable reflection phase distributions for either normal or oblique incidence plane wave,so as to achieve flexible redirection of the angle of reflection.As a result,the agile effect for monostatic or bistatic cross-section enhancement is then facilitated.Taking a conducting plate as an example,three different incidence and reflection scenarios are considered for calculation and full-wave simulation.Reconfigurable scattering patterns produced at the operating frequency of 10 GHz by the presented design are observed,which indicates its capability of real-time control of the angle of reflection.In conjunction with an experimental measurement,the effective enhancement of monostatic and bistatic cross-sections are validated.

关 键 词：后向散射 双站散射 有源超表面 方向图重构 

分 类 号：O441.4[理学—电磁学]