Revisiting composite right-/left-handed transmission lines and symmetric couplers

The current research aimed to elaborate some hidden aspects of Composite Right-/Left-Handed (CRLH) Transmission Lines (TLs) and couplers. To this end, a complete and detailed dispersion analysis of an isolated CRLH TL was presented including lossless and lossy cases based on a conventional unit cell that was devised formerly. The dispersion analysis of the CRLH TLs was extended from conventional to accurate unit cells. The capability of TLs containing such unit cells to support the RLH waves was also demonstrated. A pure analytical strategy was then proposed for parameter extraction of the CRLH TLs and symmetric couplers based on accurate circuit models. According to the observations, once the loss parameters were included in the circuit model, no need would be felt to make use of curve fitting methods for extracting the parameters of the couplers under study. (c) 2023 Sharif University of Technology. All rights reserved.