Wideband Radar-Cross-Section Reduction Using Parabolic Phased Metasurfaces
Wideband Radar-Cross-Section Reduction Using Parabolic Phased Metasurfaces
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DOI：
10.1109/lawp.2023.3250453
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发表时间：
2023-07
影响因子：
4.2
通讯作者：
M. Al-Nuaimi;W. Whittow;Guanhua Huang;Rui-Sen Chen;S. Wong
中科院分区：
文献类型：
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作者：
M. Al-Nuaimi;W. Whittow;Guanhua Huang;Rui-Sen Chen;S. Wong
本文提出了一种快速、高效的亚表面设计方法，无需使用耗时的优化算法，适用于广角低散射应用和宽带雷达散射截面(RCS)的降低。利用光线跟踪理论，通过将所提出的亚表面设计成在中心频率(f=18 GHz)以外的频率处呈现沿其孔径的扩散抛物线相位分布，通过在大范围的频率范围内重定向所有方向的反射能量来保证显著的后向散射。基于该方法，研究了抛物线相分布在1f到20f之间的准曲面的散射行为。数值计算和实验结果都表明，5f相分布的准表面比1f相分布的准表面更能均匀地分布散射能量。利用该方法设计的亚表面在12~24 GHz的宽带范围内(66.7%)实现了超过10dB单/双基地RCS的降低，甚至在60°的非正常入射情况下也得到了降低。该方法克服了传统棋盘宽频带散射角和元面编码的固有难题。
This letter presents a fast and efficient metasurface design approach without using time-consuming optimization algorithms, for wide-angle low scattering applications and wideband radar-cross-section (RCS) reduction. Using ray-tracing theory and by engineering the proposed metasurfaces to exhibit a diffusive parabolic phase distribution across its aperture at frequencies other than the center frequency (f = 18 GHz), significantly diffused backscattering is guaranteed by redirecting the reflected energies over all directions over a wide range of frequencies. Based on the proposed approach, the scattering behavior of metasurfaces with parabolic phase distributions from 1f to 20f was carefully investigated. Numerical and experimental results both demonstrated that a metasurface of phase profile at 5f is extremely powerful in distributing the scattering energy more uniformly than a metasurface of 1f phase profile. The designed metasurfaces using the proposed approach achieved more than 10 dB monostatic/bistatic RCS reduction over a wideband frequency range from 12 to 24 GHz (66.7%) and even for off-normal incidence up to 60°. The proposed approach can overcome the inherent challenges of ensuring wide scattering angle over wideband frequencies of conventional chessboard and coding metasurfaces in the literature.