A triband band-stop spatial filter shield using frequency selective surface is designed and analyzed to block GSM 900, 1800, and Wi-Fi 2400 MHz frequency bands. Three constituent resonant elements exhibiting stop-bands are two Jerusalem cross (JC) elements with tortuous main arms, and a 45° rotated JC. The proposed unitcell is compact with size 0.078λ ₀ x 0.078λ ₀ , where λ ₀ is the wavelength of lowest resonant frequency in free space. An equivalent circuit model is developed to understand the behavior of its constituent elements. The proposed design offers better miniaturization and stable frequency response for up to 60° of incidence angle for both TE and TM polarizations, as compared to the earlier reported designs in the bands mentioned previously. Shielding effectiveness is verified with measurements in an anechoic chamber.

中文翻译：

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用于屏蔽 GSM 0.9、1.8 和 Wi-Fi 2.4 GHz 频段的小型化角稳定 FSS

设计并分析了使用频率选择表面的三频带阻空间滤波器屏蔽，以阻止 GSM 900、1800 和 Wi-Fi 2400 MHz 频段。显示阻带的三个组成谐振元件是两个具有弯曲主臂的耶路撒冷十字 (JC) 元件和一个旋转 45° 的 JC。所提出的晶胞是紧凑的，尺寸为 0.078λ ₀ x 0.078λ ₀ ，其中 λ ₀是自由空间中最低谐振频率的波长。开发等效电路模型以了解其组成元件的行为。与前面提到的频段中早期报告的设计相比，所提出的设计为 TE 和 TM 极化提供了更好的小型化和稳定的频率响应，最高可达 60° 的入射角。屏蔽有效性通过在消声室中进行的测量来验证。