In this paper, we propose an approach to design metasurfaces to realize superior performance for monostatic and bistatic radar cross section (RCS) reduction within a wide bandwidth. By engineering four subarrays to exhibit different hybrid focusing-linear phases within a metasurface, nearly uniform diffusive scattering can be inherently guaranteed. As an illustration, we design and fabricate a proof-of-prototype metasurface and experimentally demonstrate its wave-diffusion performances. Numerical and experimental results both show that the thin metasurface enables a monostatic/bistatic 10 dB RCS reduction over a broad bandwidth ranging from 7.2 to 17.2 GHz. In addition, more than 10 dB RCS reduction performance is preserved within a band of 7.8 ∼ 14.2 GHz even for off-normal incidence up to 60°. Our approach features broadband, polarization insensitive, wide incident angles and easy design without time-consuming optimization, promising great potentials in applications of low-sca...

中文翻译：

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基于超表面实现宽带单静态/双静态RCS降低的混合阶段方法

在本文中，我们提出了一种设计超颖表面的方法，以实现在宽带宽内降低单基地和双基地雷达截面（RCS）的卓越性能。通过工程化四个子阵列以在超颖表面内展现不同的混合聚焦线性相位，可以固有地保证几乎均匀的扩散散射。作为说明，我们设计并制作了原型验证超颖表面，并通过实验证明了其波扩散性能。数值和实验结果均表明，薄的超颖表面可在7.2至17.2 GHz的宽带宽内将单静态/双静态RCS降低10 dB。此外，即使在垂直入射角高达60°的情况下，在7.8〜14.2 GHz的频带内仍可保持10 dB以上的RCS降低性能。我们的方法以宽带，