Wideband RCS reduction of thin metallic edges mediated by spoof surface plasmon polaritons

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI:10.1051/EPJAM/2020018
Xinghua Li, Mingde Feng, Jiafu Wang, Xinmin Fu, Yajuan Han, S. Sui, Y. Pang, Qu Shaobo
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Abstract

The back-scattering from front edge diffraction contributes significantly to mono-static radar cross section under TE-polarization when the specular reflection of an object is eliminated by elaborate shaping. With the aim to suppress the back-scattering of thin metallic edge, we propose to achieve wideband radar cross section (RCS) reduction by integrating an absorbing structure (AS) in front of the edge. The unit cell of AS is composed of a longitudinal array of metallic strips with linearly decreasing lengths. Under TE-polarized illumination, spoof surface plasmon polariton (SSPP) can be excited with high efficiency. Due to the deep-subwavelength property of SSPP, electromagnetic waves are highly confined around the AS, leading to strong local field enhancement and hence to wideband absorption. In this way, back-scattering of the edge is suppressed and the mono-static RCS can be reduced significantly over wide band. To verify this method, we designed, fabricated and measured a prototype. The results of both simulation and measurement indicate that our proposal can significantly suppress edge scattering, whose RCS reduction more than 10 dB achieves at range of 8.8–17.8 GHz under TE polarization. This work provides a new alternative of suppressing edge diffraction and may find applications in electromagnetic compatibility, radar stealth, etc.
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欺骗表面等离子激元极化子介导的薄金属边缘宽带RCS衰减
通过精细整形消除物体镜面反射后,前缘衍射产生的后向散射对te偏振下的单静态雷达横截面有显著影响。为了抑制金属薄边缘的后向散射,我们提出在边缘前集成吸收结构(AS)来减小宽带雷达截面(RCS)。原子吸收光谱的单元格是由长度线性递减的金属条组成的纵向阵列。在te偏振照明下,欺骗表面等离子激元(SSPP)可以高效激发。由于SSPP的深亚波长特性,电磁波被高度限制在AS周围,导致强局部场增强,从而导致宽带吸收。这样可以抑制边缘的后向散射,在宽带范围内显著降低单静态RCS。为了验证这一方法,我们设计、制作和测量了一个原型。仿真和测量结果表明,在TE极化的8.8 ~ 17.8 GHz范围内,我们的方案可以显著抑制边缘散射,RCS降低幅度大于10 dB。这项工作为抑制边缘衍射提供了一种新的选择,并可能在电磁兼容、雷达隐身等方面得到应用。
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来源期刊
EPJ Applied Metamaterials
EPJ Applied Metamaterials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.10
自引率
6.20%
发文量
16
审稿时长
8 weeks
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