Review of Some New Spoof Surface Plasmon Polariton Waveguides

In this paper, some new spoof surface plasmon polariton (SSPP) waveguides are presented, including the fish-bone structure with enhancement of the field confinement, coplanar stripline-based SSPP waveguide, broadband high-mode SSPP waveguide, and differential-fed SSPP waveguide. The dispersion features and frequency response of these presented SSPP structures are demonstrated and analyzed providing guidance to facilitate further similar designs. Some of these proposed ideas are not only validated in terahertz regime, but also proved by designing, fabricating, and measuring the prototypes in microwave. Through these developments, the frontier of researches on SSPPs has been pushed forward.