Design and Analysis of an Ultra-wideband Frequency Selective Surface with Adjustable Stopband

In this study, a novel structure, which is applied to different metal layers of ultra-wideband frequency selective surfaces (FSS), is proposed. It has been found that by adjusting the size of the circular coupling metal pieces in the novel structure, a narrow stopband can be generated at different locations within the passband, which can be used to shield narrowband electromagnetic interference (EMI). In addition, the equivalent circuit model of the novel FSS is also given in this paper, and it provides references for more comprehensive understanding of the FSS' s filtering mechanism and the improvement of subsequent performance.