Spoof Surface Plasmon Polaritons Developed from Coplanar Waveguides in Microwave Frequencies

Jianxing Li, Junwei Shi, Kai Da Xu, Ying Jiang Guo, Anxue Zhang, Qiang Chen

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number9223719
Pages (from-to)1431-1434
Number of pages4
JournalIEEE Photonics Technology Letters
Volume32
Issue number22
DOIs
Publication statusPublished - 2020 Nov 15

Keywords

  • Coplanar waveguide (CPW)
  • low-pass filter
  • microwave regime
  • spoof surface plasmon polaritons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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