Abstract In the paper, a tri-band angularly stable frequency selective surface (FSS) with controllable resonances for electromagnetic shielding is proposed. Different from traditional single-layer structure, the FSS proposed is based on cascaded structure that creates three adjustable blocking bands around frequency 5.93 GHz, 7.33 GHz and 9.17 GHz, respectively. The designed FSS has a low profile with thickness of λ0/100, where the λ0 represents wavelength of the first band-stop resonance frequency. Besides, the proposed FSS exhibits stable frequency response up to 70° with respect to different polarizations. Therefore, this FSS is flexible and can be used in electromagnetic shielding field where needs conformal screen. To investigate and understand the operating mechanism better, a equivalent circuit model (ECM) is deduced and given in the Section 2, the calculated results match the full-wave EM simulation results perfectly. Finally, a prototype of this FSS is fabricated and measured, the measurement results are in accordance with the simulation results.

中文翻译：

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用于电磁屏蔽的具有可控谐振的三频角稳定频率选择表面

摘要 在本文中，提出了一种用于电磁屏蔽的具有可控谐振的三频角稳定频率选择表面（FSS）。与传统的单层结构不同，所提出的 FSS 基于级联结构，在频率 5.93 GHz、7.33 GHz 和 9.17 GHz 附近分别创建了三个可调阻塞带。设计的 FSS 具有低剖面，厚度为 λ0/100，其中 λ0 代表第一带阻谐振频率的波长。此外，所提出的 FSS 相对于不同的极化表现出高达 70° 的稳定频率响应。因此，该FSS具有灵活性，可用于需要保形屏的电磁屏蔽领域。为了更好地调查和了解运行机制，在第 2 节中推导并给出了等效电路模型 (ECM)，计算结果与全波 EM 仿真结果完美匹配。最后制作并测量了该FSS的样机，测量结果与仿真结果一致。