This letter presents a novel phase-cancellation and absorptive metasurface (PCAM) with ultralow scattering and broadband features. The PCAM is formed by two circular frequency selective surface elements with lumped resistors, which can not only reduce reflection amplitudes by transforming the incident waves into heat but also adjust reflection phase responses simultaneously. The two electromagnetic scattering mechanisms, phase cancellation and absorption, cooperate in the same band and single layer. This is the first proposed ultralow backscattering performance where the monostatic radar cross section (RCS) is reduced by more than 20 dB in 5.0–10.9 GHz. Simultaneously, an RCS reduction over 10 dB is achieved at a broad frequency band of 4.1–12.0 GHz under normal incidence. Both the analysis and measurements are demonstrated in detail. The good agreement between simulated and measured results validates the proposed PCAM.

中文翻译：

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使用嵌有集总电阻器的相位可调FSS元件实现超低散射和宽带超表面

这封信提出了一种具有超低散射和宽带特征的新型相消除和吸收性超表面（PCAM）。PCAM由两个带有集总电阻的圆形频率选择表面元件组成，它们不仅可以通过将入射波转换成热量来降低反射幅度，而且可以同时调整反射相位响应。相位抵消和吸收这两种电磁散射机制在同一频带和单层中协同工作。这是首次提出的超低反向散射性能，其中在5.0–10.9 GHz内，单基地雷达截面（RCS）降低了20 dB以上。同时，在垂直入射情况下，在4.1–12.0 GHz的宽频带内，RCS降低了10 dB以上。分析和测量均已详细演示。