In this article, a new spoof surface plasmon polariton (SSPP) waveguide developed from traditional coplanar waveguide (CPW) is proposed. The asymptotic frequency of the SSPP unit cell can be easily manipulated by changing the meander groove dimensions of the SSPPs. A simple and efficient mode-conversion structure with gradient groove lengths is designed on the CPW’s ground to match the momentum of CPW to the proposed SSPPs smoothly. The designed SSPP waveguide has a good low-pass filtering property with cut-off frequency at 10.4 GHz. On this basis, another improved SSPP waveguide based on conventional grounded CPW (GCPW) is constructed, where a defected ground structure (DGS) is employed on the bottom layer of the circuit. Compared with the above work, this design has a lower cut-off frequency (8.9 GHz) and stronger field confinement. In order to validate the propagation performance, both SSPP waveguides are fabricated and measured. The measurements show that the GCPW based SSPP waveguide can effectively reduce the cut-off frequency. Such results are of great significance to the miniaturizations of plasmonic devices in microwave regime.

中文翻译：

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从微波频率中的共面波导开发的欺骗表面等离子体激元

在本文中，提出了一种从传统共面波导 (CPW) 发展而来的新型欺骗表面等离子体激元 (SSPP) 波导。SSPP 晶胞的渐近频率可以通过改变 SSPP 的曲折槽尺寸轻松控制。在 CPW 的地面上设计了一种简单有效的具有梯度凹槽长度的模式转换结构，以将 CPW 的动量与所提出的 SSPP 平滑地匹配。所设计的 SSPP 波导具有良好的低通滤波特性，截止频率为 10.4 GHz。在此基础上，构建了另一种基于传统接地CPW（GCPW）的改进SSPP波导，其中电路底层采用缺陷接地结构（DGS）。与上述工作相比，该设计具有更低的截止频率（8.9 GHz）和更强的场约束。为了验证传播性能，制作并测量了两种 SSPP 波导。测量表明，基于 GCPW 的 SSPP 波导可以有效降低截止频率。这些结果对微波领域等离子体器件的小型化具有重要意义。