Compact spoof surface plasmon polaritons guide

We propose a compact spoof surface plasmon polaritons (SSPPs) guide, converting the quasi-transverse electromagnetic (QTEM) mode of low characteristic impedance slotline into the surface plasmon mode of corrugated metallic strip. The dispersion curve of the proposed transmission line (TL) can be tailored by changing geometric parameters of grooves. Compared to conventional mode converters between coplanar waveguides (CPWs) and SSPPs guides, the proposed structure halves the size that may pave way to integrated circuits based on SSPPs.