Mode Composite Waveguide Based on Hybrid Substrate Integrated Waveguide and Spoof Surface Plasmon Polariton Structure. - Zhang-Biao Yang; Dongfang Guan; Qingfeng Zhang; Hantao Xu; Mingtuan Lin; Ximeng Zhang; Rentang Hong; Shaowei Yong (IEEE Trans. Circuits Syst. I Regul. Pap., 2021)