一种基于相位梯度原理的反射型电磁超表面及RCS缩减应用
A Reflective Electromagnetic Metasurface Based on Phase Gradient Principle and RCS Reduction Application
赵浥彤 1张文琦 1周健 1相倩1
作者信息
摘要
针对电磁波束调控和电磁隐身问题,本文设计了一种在圆形贴片上开口十字缝隙形式的反射型相位梯度超表面,通过对单元尺寸的调节实现了差异的反射相位覆盖,该系列超表面作用于X波段,按照线性、等相位差形式排布超表面单元能够将反射波最大散射方向偏转至关注角域以外,且通过对相位梯度数值的人为设计,能够精确控制最大散射方向,降低单站后向散射的同时兼顾了降低关注角域内的双站散射,具备针对单站雷达截面积(RCS)减缩、双站RCS散射方向调控的能力,且单元结构采用对称设计方式,具有极化不敏感的特性,基于此相位梯度超表面设计了一维、二维相位梯度超表面阵列结构,一维阵列结构的频带内单站RCS峰值减缩了41.13dB,均值缩减了8.7dB,面内最大散射方向偏转了16.5°;二维阵列结构的频带内单站RCS峰值减缩了16.29dB,均值减缩了9.04dB,最大散射方向发生了俯仰23°、方位135°偏转,均具备较好的单站和双站雷达隐身效果.
Abstract
For electromagnetic beamforming and electromagnetic stealth issues,a reflective phase gradient metasurface in the form of cross slits on a circular patch is designed,and the differential reflective phase coverage is achieved by adjusting the cell size.Metasurface acts in the X-band and arranges the metasurface units in a linear,equal-phase difference format to deflect the maximum scattering direction of the reflected wave out of the angular field of interest.By adjusting the value of the phase gradient,the maximum scattering direction can be precisely controlled to reduce monostatic backscattering while taking into account the reduction of bistatic scattering in the angle of interest domain.The unit structure is symmetrically designed with polarization-insensitive characteristics.Based on this phase gradient metasurface,the 1D and 2D phase gradient metasurface arrays are designed.The peak RCS of the 1D array structure is reduced by 41.13dB,the mean value is reduced by 8.7dB,and the maximum scattering direction is deflected by 16.5°;the peak RCS of the 2D array structure is reduced by 16.29dB,the mean value is reduced by 9.04dB,and the maximum scattering direction is phi=135°,theta=23°.1D and 2D arrangement forms achieve monostatic and bistatic radar stealth effect.
关键词
左手材料/电磁超表面/相位梯度超表面/雷达截面积/斯涅尔定理Key words
left-hand material/metasurface/phase gradient metasurface/RCS/Snell's law引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据