X及Ku波段宽带极化转换超表面设计及RCS缩减应用  

Design of Broadband Polarization Conversion Metasurface for X and Ku Bands and RCS Reduction Applications

作　　者：赵浥彤 王钢林 唐兴中 李岩 Zhao Yitong;Wang Ganglin;Tang Xingzhong;Li Yan(Chinese Aeronautical Establishment,Beijing 100029,China)

机构地区：[1]中国航空研究院,北京100029

出　　处：《航空科学技术》2024年第2期100-105,共6页Aeronautical Science & Technology

摘　　要：针对反高分辨率雷达探测的电磁隐身问题,本文设计了一种作用于X和Ku波段的宽带反射型极化转换超表面,能够在6.5~8GHz范围内实现85%以上的极化转换效率,在8~20GHz范围内实现90%以上的极化转换效率,极化转换效率在85%以上的相对带宽达到了101%,且超表面剖面较低,整体厚度小于3.6mm,并将其自身和镜像单元设计成了方形式和三角式棋盘阵列排布结构。在x极化和y极化电磁波垂直入射下,与同等大小金属相比,两种棋盘式阵列排布结构的雷达截面积(RCS)缩减效果明显,且具有极化不敏感的特性,其中方形式棋盘结构RCS缩减峰值达到了22.91dB,RCS减缩均值达到了11.73dB;三角式棋盘结构RCS缩减峰值达到了36.07dB,RCS减缩均值达到了12.29dB,起到了大幅度降低单站RCS提升电磁隐身性能的作用。For anti-detection of high-resolution radar and electromagnetic stealth issues,a broadband reflective polarization conversion metasurface is designed for X and Ku bands,which can achieve more than 85%polarization conversion efficiency in the range of 6.5~8GHz and more than 90%polarization conversion efficiency in the range of 8~20GHz,and the relative bandwidth of polarization conversion efficiency above 85%is 101%,and the thickness of metasurface structure is less than 3.6mm.Square and triangle chessboard structures are designed based on this metasurface,the radar scattering cross section of both chessboard structures has been greatly reduced under vertical incidence of x-polarized and y-polarized electromagnetic waves compared with the same size metal.Both have polarization insensitive characteristics,in which the maximum RCS reduction of square chessboard structure reaches 22.91dB,and the average RCS reduction of square chessboard structure reaches 11.73dB.The maximum RCS reduction of triangle chessboard structure reaches 36.07dB,and the average RCS reduction of triangle chessboard structure reaches 12.29dB,playing a significant role in reducing the single station RCS and improving electromagnetic stealth performance.

关 键 词：极化转换超表面 雷达截面积 极化转换效率 人工磁导体 棋盘式排布 

分 类 号：TN015[电子电信—物理电子学]