In this paper, a novel design of ultra-wide stop-band single-side single-layer frequency selective surface (FSS) is presented. The unit cell of the proposed FSS is designed using the combination of conventional square loop and cross (CSLC). To enhance the bandwidth of this structure, an additional cross is inserted in all the four quadrants of CSLC. The stop-band transmission bandwidth assuming −10 dB threshold is found to be 128.94% (2.16–10 GHz) which is 34.33% more as compared to the bandwidth of CSLC. The unit cell with a dimension of 16 × 16 mm2 is printed on one side of an FR4 substrate. The design is fabricated and the measured results are found to be in good agreement with the simulated results. The design provides excellent stability for both transverse magnetic and transverse electric polarizations. The design is very flexible, where any resonant frequency can be achieved by changing the length of unit cell. The design is useful in many applications such as antenna gain enhancement, electromagnetic wave shielding for Wi-Fi/5G systems, and other Internet of Things-based applications.

中文翻译：

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一种利用方环和交叉的超宽阻带单层选频表面的新设计

在本文中，提出了一种超宽阻带单面单层频率选择表面（FSS）的新颖设计。所提出的 FSS 的单位单元是使用传统的方环和交叉 (CSLC) 的组合设计的。为了提高这种结构的带宽，在 CSLC 的所有四个象限中都插入了一个额外的十字。假设 -10 dB 阈值的阻带传输带宽被发现为 128.94%（2.16-10 GHz），与 CSLC 的带宽相比增加了 34.33%。尺寸为 16 × 16 mm 的单元电池2印刷在 FR4 基材的一侧。设计完成，测量结果与模拟结果非常吻合。该设计为横向磁化和横向电极化提供了出色的稳定性。该设计非常灵活，可以通过改变晶胞的长度来实现任何谐振频率。该设计可用于许多应用，例如天线增益增强、Wi-Fi/5G 系统的电磁波屏蔽以及其他基于物联网的应用。