Realization of Single-Layer Fourier Phased Metasurfaces for Wideband RCS Reduction
Realization of Single-Layer Fourier Phased Metasurfaces for Wideband RCS Reduction
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DOI：
10.1109/lawp.2023.3235970
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发表时间：
2023-05
影响因子：
4.2
通讯作者：
M. Al-Nuaimi;Guanhua Huang;W. Whittow;Rui-Sen Chen;S. Wong
中科院分区：
文献类型：
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作者：
M. Al-Nuaimi;Guanhua Huang;W. Whittow;Rui-Sen Chen;S. Wong
本文提出了一种高效、快速的单层傅里叶相控超颖表面设计与实现方法，用于圆极化（CP）平面波照射下宽带雷达散射截面（RCS）减缩。所提出的超颖表面的每个单元格处所需的散射相位（在0°和360°之间）使用傅立叶相位公式来计算，其中焦距（F）与相位分布成反比。采用Pancharatnam-Berry（PB）相位理论和亚波长周期性的单胞，进一步增强了散射和RCS减缩特性。该宽带傅里叶相控超颖表面具有正方形形状，包含30 × 30 PB的亚波长周期为5 mm × 0.26λ16 GHz的单胞.仿真和实测结果表明，无论F值如何，所提出的傅里叶相控超颖表面在CP平面波正入射下都能实现10 dB以上的RCS减缩。在斜入射条件下，当入射角达到60°时，RCS减小量保持在10 dB以上。此外，单层傅里叶相控超颖表面具有宽带10 dB RCS降低带宽从10到24 GHz，厚度仅为2 mm。这导致了82.3%的RCS降低分数带宽，这高于文献中报道的其他设计。所提出的设计策略提供了一种很有前途的方法来设计和实现宽带和稳定的RCS缩减性能的元表面，而不需要使用计算复杂和/或耗时且运行缓慢的优化算法。
An efficient and fast strategy to design and realize single-layer Fourier phased metasurfaces for wideband radar cross-section (RCS) reduction when illuminated by a circular polarization (CP) plane wave is proposed in this letter. The scattering phase (between 0° and 360°) required at each unit cell of the proposed metasurfaces was computed using the Fourier phase formula in which the focal length (F) is inversely proportional to the phase distribution. Pancharatnam–Berry (PB) phase theory was applied with unit cells of subwavelength periodicity to further enhance the scattering and RCS reduction characteristics. The proposed wideband Fourier phased metasurface has a square shape and contains 30 × 30 PB unit cells with subwavelength periodicity of 5 mm ≈ 0.26λ16 GHz. Both simulation and measured results show that the proposed Fourier phased metasurfaces can achieve more than 10 dB of RCS reduction under normal incidence of CP plane wave regardless of the value of F. Under oblique incidence, more than 10 dB of RCS reduction was maintained for incident angles up to 60°. In addition, the single-layer Fourier phased metasurface features wideband 10 dB RCS reduction bandwidth from 10 to 24 GHz with a thickness of only 2 mm. This resulted in an 82.3% fractional bandwidth of RCS reduction, which is higher than the other designs reported in the literature. The proposed design strategy provides a promising way to design and realize metasurfaces for wideband and stable RCS reduction performance without the need to use a computationally complex and/or time-consuming and slow running optimization algorithm.