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<p>In this paper, a broadband bandpass filter based on spoof surface plasmon polaritons (SSPPs) is proposed and analyzed in detail. The SSPP unit cell is carefully designed to support fundamental mode propagation and produce a bandpass response. By adjusting a single geometric parameter of the SSPP unit cell, the design enables flexible control of the operating bandwidth with minimal variation in the center frequency. To verify the validity and effectiveness of the proposed concept, a prototype filter was fabricated, assembled, and experimentally tested. The measured results agree well with the simulated ones, showing a 3-dB fractional bandwidth of 121% with a measured insertion loss of 1.48 dB. Benefiting from its compact structure, low loss, and independently controllable bandwidth, the proposed SSPP-based filter exhibits excellent broadband characteristics and holds strong potential for application in high-performance microwave and millimeter-wave communication systems, especially in emerging 5G platforms.</p>

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Broadband Bandpass Filter Based on Spoof Surface Plasmon Polaritons with Single-parameter Cutoff Control

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Jinxiao Yang,
  • Zhe Chen,
  • Runfeng Tang,
  • Weilin Li,
  • Wenzhuo Li,
  • Jianfeng Shi,
  • Shuyu Li

摘要

In this paper, a broadband bandpass filter based on spoof surface plasmon polaritons (SSPPs) is proposed and analyzed in detail. The SSPP unit cell is carefully designed to support fundamental mode propagation and produce a bandpass response. By adjusting a single geometric parameter of the SSPP unit cell, the design enables flexible control of the operating bandwidth with minimal variation in the center frequency. To verify the validity and effectiveness of the proposed concept, a prototype filter was fabricated, assembled, and experimentally tested. The measured results agree well with the simulated ones, showing a 3-dB fractional bandwidth of 121% with a measured insertion loss of 1.48 dB. Benefiting from its compact structure, low loss, and independently controllable bandwidth, the proposed SSPP-based filter exhibits excellent broadband characteristics and holds strong potential for application in high-performance microwave and millimeter-wave communication systems, especially in emerging 5G platforms.