A Broadband and High-Efficiency Compact Transition From Microstrip Line to Spoof Surface Plasmon Polaritons

Spoof surface plasmon polaritons (SSPPs) have been considered as a new-type surface wave transmission line (TL) because of its single line feature. However, it cannot be directly fed by the measured system because the transmission mode of SSPP TLs is totally different from the traditional TLs like microstrip lines. Also, the existing solutions require complicated structures and a big area on the c...