This article presents a dual-band bandpass filter based on the double-sided spoof surface plasmon polaritons-line. The whole structure consists of a dual-band filtering part and two SSPPs lowpass filtering parts. Simulated results show that the proposed dual-band bandpass filter has an excellent dual-band filtering performance and wide upper band suppressions. Simulated bandwidths of two passbands are 41% (2.36–3.58 GHz) and 13.9% (6.7–7.7 GHz). It can realize the suppression of $S_{21}$ below −40 dB from 9.6 to 39.7 GHz. A prototype has been fabricated and measured. Measured results are in a good agreement with simulated ones, which validates our design concepts and methods. The proposed dual-band bandpass filter will have significance in microwave device designing, especially in the plasmonic device in microwave frequencies.

中文翻译：

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具有出色双频带滤波和宽高频带抑制的双面欺骗表面等离子体激元线带通滤波器

本文提出了一种基于双面欺骗表面等离子体激元线的双带带通滤波器。整个结构由一个双频滤波部分和两个SSPPs低通滤波部分组成。仿真结果表明，所提出的双频带带通滤波器具有优良的双频带滤波性能和较宽的高频带抑制。两个通带的模拟带宽分别为 41% (2.36–3.58 GHz) 和 13.9% (6.7–7.7 GHz)。它可以在 9.6 至 39.7 GHz 范围内实现对 $S_{21}$ 低于 −40 dB 的抑制。已经制造并测量了原型。实测结果与仿真结果吻合良好，验证了我们的设计理念和方法。所提出的双带带通滤波器在微波器件设计中具有重要意义，特别是在微波频率的等离子体器件中。