Splitting spoof surface plasmon polaritons to different directions with high efficiency in ultra-wideband frequencies

An efficient method to split spoof surface plasmon polaritons (SSPPs) to different directions is proposed by designing a low-loss SSPP waveguide in an ultrawide frequency band. For this purpose, a coplanar-waveguide-based SSPP structure with double-row hole arrays etched on its middle line is first studied, which can be easily used to split the SSPP waves. Based on this method, a Y-shaped −3  dB SSPP power divider and its application on a Mach–Zehnder interferometer are presented. The experiment demonstrates that the proposed method splits the SSPP waves to different directions effectively in ultrawide frequencies (2.5–39.7 GHz) with good isolations, indicating that the proposed SSPP power divider can have good application on a Mach–Zehnder interferometer and plasmonic integrated circuits.