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<p>We present a novel spoof surface plasmon waveguide (SPW) and low-pass filter design employing double-layered glide-symmetric corrugated metal lines. The key innovation of this work is the achievement of broadband, high-efficiency transmission through the synergistic combination of double-layered glide symmetry and an optimized gradient mode-matching technique. The dispersion curve for the two lowest-order modes of the proposed SPW presents unique degeneracy at the Brillouin zone boundary as that of SPW with double-layered symmetrical metal gratings, which leads to a wider operating bandwidth with the same geometry. The design enables efficient conversion between quasi-TEM waves and spoof surface plasmon polaritons (SSPPs) through a gradient double-layered glide-symmetric transition structure. The proposed design achieves a wide 1-dB transmission bandwidth from 0 to 8.85 GHz, with insertion loss below 0.5 dB in the passband. Experimental measurements of a fabricated prototype show excellent agreement with simulations, validating the design principles and demonstrating superior performance compared to conventional single-layer SSPP structures.</p>

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High-efficiency broadband surface plasmon waveguides using a double-sided corrugated line with slip symmetry

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Caifeng Yang,
  • Xuewei Zhang,
  • Shaobin Liu

摘要

We present a novel spoof surface plasmon waveguide (SPW) and low-pass filter design employing double-layered glide-symmetric corrugated metal lines. The key innovation of this work is the achievement of broadband, high-efficiency transmission through the synergistic combination of double-layered glide symmetry and an optimized gradient mode-matching technique. The dispersion curve for the two lowest-order modes of the proposed SPW presents unique degeneracy at the Brillouin zone boundary as that of SPW with double-layered symmetrical metal gratings, which leads to a wider operating bandwidth with the same geometry. The design enables efficient conversion between quasi-TEM waves and spoof surface plasmon polaritons (SSPPs) through a gradient double-layered glide-symmetric transition structure. The proposed design achieves a wide 1-dB transmission bandwidth from 0 to 8.85 GHz, with insertion loss below 0.5 dB in the passband. Experimental measurements of a fabricated prototype show excellent agreement with simulations, validating the design principles and demonstrating superior performance compared to conventional single-layer SSPP structures.