This paper presents a miniaturized multi-band frequency selective surface for band-stop applications. The proposed design is evolved from a modified swastik structure with L-shaped arms printed on FR4 substrate. The structure is designed to operate at 2.4, 5.8, 8.6, and 10.8 GHz covering Wifi, WiMAX, and X-band applications. The proposed quad-band FSS has an overall unit cell size of 0.084 λ0 × 0.084 λ0, where λ0 is the wavelength of the lower operational frequency. The symmetric FSS structure provides the advantage of polarization independency. It also exhibits a stable frequency response up to 60° for both the horizontally polarized EM waves (Transverse Magnetic Mode) and the vertically polarized EM waves (Transverse Electric Mode). Moreover, measurement results obtained from the fabricated prototype are compared with the simulation results and are found to be in close agreement with each other. Single layer structure, compact, and coverage of multiple applications are the advantages of the proposed multiband FSS.

中文翻译：

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具有角度和偏振无关特性的小型化多频带频率选择表面

本文提出了一种用于带阻应用的小型化多频带频率选择表面。所提出的设计是从改进的 swastik 结构演变而来的，该结构具有印刷在 FR4 基板上的 L 形臂。该结构设计为在 2.4、5.8、8.6 和 10.8 GHz 下运行，涵盖 Wifi、WiMAX 和 X 波段应用。所提出的四波段 FSS 的整体晶胞尺寸为 0.084 λ0× 0.084 λ0, 其中 λ0是较低工作频率的波长。对称 FSS 结构提供了偏振无关的优点。对于水平极化的电磁波（横磁模式）和垂直极化的电磁波（横电模式），它还表现出高达 60° 的稳定频率响应。此外，从制造的原型获得的测量结果与仿真结果进行了比较，发现彼此非常吻合。单层结构、紧凑、覆盖多种应用是所提出的多频段FSS的优点。