X波段柔性编码超表面设计与RCS缩减研究

设计了一种柔性非定向低散射2 bit编码超表面。将4 种具有不同反射相位的基本单元随机排列构成整个相位梯度超表面,其对入射电磁波形成无规则散射,实现RCS 缩减特性。实验结果表明:在频点8.40 GHz处,编码超表面的垂直入射反射率为-13.5 dB,偏离法线-30°-30°范围RCS平均缩减为10.0 dB。进一步的研究结果表明,编码超表面弯曲在直径为7 cm 的圆柱面上,RCS平均缩减可达7.8 dB。该超表面可实现曲面的RCS有效缩减。该柔性编码超表面在天线、电磁隐身等领域具有潜在的应用价值。

Design and Study of X Band Flexible Coding Metasurface for RCS Reduction

In this paper, we propose a non-directional lowing scattering and flexible 2 bit coding metasurface. The four basic units with different reflection phase constituted the whole phase gradient surface by random arrangement; this coding metasurface can achieve reduction of RCS by the diffuse reflection of incident electromagnetic wave. The experimental results show that the reflectivity is -13.5 dB for coding metasurface can be achieved at 8.40 GHz, and the RCS reduction as compared with a bare metallic plate with the same size is average 10. 0 dB when deviating -30°-30° from the normal incidence. The further studied results indicate that the characteristic of RCS reduction can be kept up as the coding metasurface is wrapped around a cylinder with a diameter of 7 cm, and the RCS reduction is average 7.8 dB. This flexible coding metasurface is expected to have potential application value in the field of antenna and stealth.