Design and Performance Comparison of THz Slow Wave Spoof Plasmonic Metamaterial Based Transmission Lines

In this paper, we discuss the full modelling of slow wave spoof plasmonic metamaterial based transmission lines at THz frequency. In the presented work, back to back transition from CPW, coplanar strip and microstrip to spoof plasmonic mode have been designed and their performance is analyzed and compared. The designed transmission lines are of same physical dimensions of 3.5 mm X 0.6 mm and have a cut off frequency of 1.25 THz for all. Simulated reflection and transmission losses are below 10 dB and 5 dB respectively. For different frequency bands, individual transmission line has different transmission efficiency. It is observed that at lower frequency, microstrip based conductor backed SSPP transmission line and coplanar strip to SSPP transmission lines have good transmission efficiency and at higher frequency, CPW line offers better transmission efficiency. Also, microstrip based conductor backed transmission line provide better performance as compared to coplanar strip. The above mentioned spoof plasmonic metamaterial based transmission lines will have a potential application in plasmonic integrated circuits and systems.