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Xinyu Hu

at Communication Univ of China

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Proceedings Article | 2 December 2020 Paper

Ultra-wide bandstop filter based on nested square resonant ring

Yuqian Cai, Baichuan Yao, Xinyu Hu, Bin Li

Proceedings Volume 11717, 1171721 (2020) https://doi.org/10.1117/12.2587191

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A nested resonant ring structure composed of double split square ring based on frequency selective surface (FSS) is proposed to realize ultra-wide bandstop filter. To begin with, the structure is supposed by a single layer, adding the number of resonant rings and metal-dielectric layers to adjust frequency points and bandwidth. Through numerical simulation, we found that the location of the frequency points depended on horizontal nested rings and the transmission coefficient improved by multiply layers. In order to enhance the flatness of stopband, the depth and size of slots are calculated, showing 1.72THz stop-band from 1.27THz to 2.99THz. The result demonstrates that the range of bandwidth achieve 1.5THz with transmission depth up to 20dB, and flat bandstop as well as out-band rejection are well-performed compared with traditional slot structure.

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