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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Dual wideband, polarization, angle-insensitive diffusion electromagnetic surfaces for radar cross section reduction
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Dual wideband, polarization, angle-insensitive diffusion electromagnetic surfaces for radar cross section reduction

机译：用于雷达横截面的双宽带，极化，角度不敏感的扩散电磁表面

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摘要

In this paper, we introduce an effective technique for designing diffusion electromagnetic (EM) surfaces with polarization and angle-insensitive characteristics over multiple wide bands. The proposed EM surface consists of a random pixelated metal structure in the middle of double substrate layers and a metallic ground at the bottom. Phase cancellation for radar cross section (RCS) reduction is achieved by different propagation paths generated by the pixelated metallic layer. The theoretical prediction of the reduction frequency band and reduction value is derived by transmission line theory, which serves as guidance to design the EM surface for the required operating band. Using this technique, an EM surface is designed for 10 dB RCS reduction over multiple frequency bands, and the first two reduction bands are 5.98-16.23 GHz and 26.69-37.1 GHz with fractional bandwidths of 92.3% and 32.6%, respectively. The non-reduction frequency band between the first two reduction bands is almost at the K-band (18-27 GHz), which is unusable for long-range transmission because of its high atmospheric loss. Moreover, the bandwidth of RCS reduction bands is stable for oblique incident angles up to 40 degrees for both TE and TM polarizations. Based on theoretical study and simulation results, a prototype of this EM surface is fabricated and experimentally characterized. The theoretical analysis, simulation and experiment results are in good agreement. The proposed method comprehensively solves the problems of narrow bandwidth, time-consuming optimization of the unit cell, high bistatic RCS value, and sensitivity to polarization and incident angles found in recent RCS reduction research.
机译：在本文中，我们介绍了一种在多个宽带上设计具有偏振和角度不敏感特性的扩散电磁（EM）表面的有效技术。所提出的EM表面由双层衬底中间的随机像素化金属结构和底部的金属接地组成。通过像素化金属层产生的不同传播路径，可以实现雷达散射截面（RCS）减小的相位对消。通过传输线理论推导出了电磁波衰减频带和衰减值的理论预测，为设计所需工作频带的电磁表面提供了指导。使用该技术，设计了一个EM表面，用于在多个频带上降低10 dB RCS，前两个降低频带分别为5.98-16.23 GHz和26.69-37.1 GHz，分数带宽分别为92.3%和32.6%。前两个还原频带之间的非还原频带几乎处于K波段（18-27 GHz），由于其高大气损耗，无法用于长距离传输。此外，对于TE和TM偏振，当斜入射角达到40度时，RCS缩减带的带宽是稳定的。根据理论研究和仿真结果，制作了该电磁表面的原型，并对其进行了实验表征。理论分析、仿真和实验结果吻合良好。该方法综合解决了近几年RCS缩减研究中发现的带宽窄、单元优化耗时、双基地RCS值高、对极化和入射角敏感等问题。

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