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<p>In this paper, two novel tree-branch spoof surface plasmon polariton (SSPP) units are proposed by adding branches on both sides of the rectangular SSPP unit, and a wideband bandpass filter (BPF) and a dual-band BPF are successively designed based on the proposed SSPP structures. Compared with the rectangular SSPP unit, the proposed tree-branch SSPP unit can effectively excite multiple high-order modes of SSPPs in smaller longitudinal dimension. The designed filter only consists of four tree-branch SSPP units, which do not require the mode conversion transition structure, leading to a miniaturized design. More significantly, by changing the length ratio relationship between the upper and lower branches of the tree-branch SSPP unit, the adjustment of the frequency bandwidth of the high-order modes can be achieved. Therefore, the passband and stopband characteristics of the filter can be flexibly modulated, which is conducive to realize the suppression of unwanted spurious signals.</p>

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Wideband and Dual-Band Bandpass Filters Using High-Order Modes of Tree-Branch Spoof Surface Plasmon Polaritons

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Baoping Ren,
  • Shengli Long,
  • Pingping Zhang,
  • Jun Li,
  • Xuehui Guan

摘要

In this paper, two novel tree-branch spoof surface plasmon polariton (SSPP) units are proposed by adding branches on both sides of the rectangular SSPP unit, and a wideband bandpass filter (BPF) and a dual-band BPF are successively designed based on the proposed SSPP structures. Compared with the rectangular SSPP unit, the proposed tree-branch SSPP unit can effectively excite multiple high-order modes of SSPPs in smaller longitudinal dimension. The designed filter only consists of four tree-branch SSPP units, which do not require the mode conversion transition structure, leading to a miniaturized design. More significantly, by changing the length ratio relationship between the upper and lower branches of the tree-branch SSPP unit, the adjustment of the frequency bandwidth of the high-order modes can be achieved. Therefore, the passband and stopband characteristics of the filter can be flexibly modulated, which is conducive to realize the suppression of unwanted spurious signals.