Spoof Surface Plasmon Polaritons Developed From Coplanar Waveguides in Microwave Frequencies
Spoof Surface Plasmon Polaritons Developed From Coplanar Waveguides in Microwave Frequencies
复制标题
从微波频率共面波导开发的欺骗表面等离子体极化激元
DOI：
10.1109/lpt.2020.3031065
复制
发表时间：
2020-11-15
影响因子：
2.6
通讯作者：
Chen, Qiang
中科院分区：
文献类型：
--
作者：
Li, Jianxing;Shi, Junwei;Chen, Qiang
本文提出了一种新型的表面等离子体激元（SSPP）波导，它是在传统共面波导的基础上发展起来的。通过改变SSPP的曲折槽尺寸，可以很容易地控制SSPP晶胞的渐近频率。在共面波导的基础上设计了一种简单有效的渐变槽长模式转换结构，使共面波导的动量与SSPP的动量平滑匹配。所设计的SSPP波导具有良好的低通滤波特性，截止频率为10.4GHz。在此基础上，构造了另一种基于传统接地共面波导（GCPW）的改进型SSPP波导，即在电路底层采用缺陷接地结构（DGS）。与上述工作相比，该设计具有较低的截止频率（8.9 GHz）和较强的场约束。为了验证传播性能，两个SSPP波导的制造和测量。测试结果表明，基于GCPW的SSPP波导可以有效地降低截止频率。这一结果对等离子体激元器件的微波性能研究具有重要意义。
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 CPWs 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.