An Odd-Mode Spoof Surface Plasmon Polaritons Supported by Complementary Trapezoid Corrugated Structure

Spoof surface plasmon polaritons (SPPs) are kinds of special surface wave modes, which have attracted wide interest of researches. However, the studies on odd-mode spoof SPPs are very limited, although it is proved to provide more tightly field confinements than the common spoof SPPs. In this paper, an odd-mode spoof SPP complementary waveguide is proposed. The dispersion analysis indicates that stronger ability of the field confinements can be obtained by trapezoid corrugations. To excite the odd-mode SPPs, a conversion structure is designed, and its outstanding transition efficiency between microstrip and the SPP waveguide is demonstrated by full-wave simulations. The near-field distributions of electric fields are also presented to show the good transmission of odd-mode SPPs on the proposed waveguide.