In this article, a polarization‐insensitive, higher angular stability, and single‐layered miniaturized wide stop‐band frequency selective surface (FSS) is presented for effective electromagnetic shielding over an extremely wideband (9‐20 GHz). A simple square gridded unit cell exhibits wideband rejection with −10 and −20 dB fractional bandwidth of 150.7% (3.4‐24.2 GHz) and 74.5% (9.14‐20 GHz), respectively. The designed unit cell has miniaturized dimensions (0.09λ₀ × 0.09λ₀ × 0.018λ₀) as compared to existing research works on wideband FSSs. An equivalent circuit model is developed for the rigorous analysis of the proposed structure. The outcome of this circuit model is validated, and it shows good agreement with the structure simulation results. The measured results bear close resemblance with the simulated results. This FSS can be used to provide shielding from harmful radiations over a wide frequency range and as a good reflector to improve the gain of wideband antennas.

中文翻译：

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具有有效电磁屏蔽功能的低剖面极化不敏感宽阻带频率选择表面

本文介绍了一种对极化不敏感的，更高的角度稳定性和单层小型化的宽带阻带频率选择表面（FSS），可在极宽的带宽（9-20 GHz）上实现有效的电磁屏蔽。一个简单的正方形网格单位单元的宽带抑制比为-10和-20 dB，分数带宽分别为150.7％（3.4-24.2 GHz）和74.5％（9.14-20 GHz）。所设计的单元电池已小型化的尺寸（0.09λ ₀  ×0.09λ ₀  ×0.018λ ₀）与现有的有关宽带FSS的研究相比。开发了等效电路模型以对所提出的结构进行严格的分析。该电路模型的结果得到了验证，并且与结构仿真结果显示出良好的一致性。测量结果与模拟结果非常相似。该FSS可以用于屏蔽宽频率范围内的有害辐射，并可以用作提高宽带天线增益的良好反射器。