Investigation of the Transitions for Coplanar Waveguide to Terahertz Spoof Surface Plasmon Polariton Waveguides

UNUTMAZ M. A., Ozsahin G., Abacilar T., Unlu M.

IEEE Transactions on Antennas and Propagation, vol.70, no.4, pp.3002-3010, 2022 (SCI-Expanded, Scopus)

  • Publication Type: Article / Article
  • Volume: 70 Issue: 4
  • Publication Date: 2022
  • Doi Number: 10.1109/tap.2021.3126369
  • Journal Name: IEEE Transactions on Antennas and Propagation
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, zbMATH, Civil Engineering Abstracts
  • Page Numbers: pp.3002-3010
  • Keywords: Coplanar waveguides, Waveguide transitions, Insertion loss, Planar waveguides, Loss measurement, Integrated circuit modeling, Signal to noise ratio, Coplanar waveguides (CPWs), corrugated waveguides (WGs), planar WGs, spoof surface plasmon polaritons (SSPPs), surface waves, terahertz, WG excitation, WGs, WG transitions
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

Abstract

© 1963-2012 IEEE.In this article, we present the investigation and design of high-performance transitions from coplanar waveguide (CPW) to single-conductor, corrugated waveguides (WGs), namely, terahertz spoof surface plasmon polariton (SSPP) WGs. In contrast to the previous studies in the literature on CPW-to-SSPP WG transitions, we propose a novel methodology to examine the relationship between the guided wavenumber and momentum matching, which is based on analytical calculations, together with the effects of flaring grounds on transition performance. This novel methodology allows us to design a low-loss transition circuit (TC) for any given CPW and SSPP dimensions, which is demonstrated for the first time in the literature. We verify the proposed methodology by the design, fabrication, and measurement of several TCs. The measurement results show that the insertion losses of the proposed TCs can be as low as -1.2, -1, and -2.4 dB at 0.25, 0.275, and 0.3 THz, respectively, which brings a significant improvement of 0.6-2.3 dB in the 0.25-0.3 THz band, compared with the previously reported studies in the literature for the terahertz band.