title: Comment on "Low-loss terahertz ribbon waveguides".
abstract: We point out an important fundamental limitation associated with the dielectric ribbon waveguide described by Yeh [Appl. Opt.44, 5937 (2005)], which would restrict its practical use in ultrahigh- or terahertz-speed guided-wave applications, contrary to their underlying prediction, and we additionally point out a noteworthy inaccuracy in their introductory discussion.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA. rajind@rice.edu
authors.forename: Rajind
authors.initials: R
authors.lastname: Mendis