In this paper, a wideband ultrathin metasurface absorber is investigated. The proposed absorber comprises a periodic array of a unit cell ring structure. The ring structure and patch inside are tuned to realize the desired frequency bandwidth. The structure has a frequency bandwidth of 7.4 GHz with a center frequency of 15 GHz and fractional bandwidth of 50%. Simulated and measured results show that the absorption at normal incidence is above 90% in the frequency range of 11.3–18.7 GHz. Furthermore, the thickness of the structure is 1.6 mm. The physical mechanism of the metasurface absorber has been analyzed and justified experimentally.

中文翻译：

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用于在 Ku 波段应用中最小化电磁干扰的单层宽带超表面吸收器

在本文中，研究了一种宽带超薄超表面吸收体。所提出的吸收器包括单元环结构的周期性阵列。调整内部的环形结构和贴片以实现所需的频率带宽。该结构的频率带宽为 7.4 GHz，中心频率为 15 GHz，分数带宽为 50%。模拟和测量结果表明，在 11.3-18.7 GHz 的频率范围内，垂直入射的吸收在 90% 以上。此外，该结构的厚度为 1.6 毫米。超表面吸收器的物理机制已经过分析和实验证明。