Left‐handed and right‐handed transmission properties of microstrip lines loaded with complementary split rings resonators

Abstract

Abstract In this work, microstrip lines loaded with complementary split rings resonators (CSRRs) and series capacitive gaps are modeled by means of a lumped element equivalent circuit. The structures exhibit a left‐handed (or backward wave) behavior at low frequencies, followed by forward transmission at higher frequencies separated by a forbidden band. The equivalent circuit model is able to accurately describe the frequency responses of the structures in the left‐handed transmission band, the forbidden band, and the lower frequency region of the forward allowed band. The limitations of this circuit model to properly predict the behavior of the structures at higher frequencies (mainly related to the Bragg effect caused by periodicity) are pointed out. This work can be of interest for the design of microwave circuits based on CSRR metamaterials. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2508–2511, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22011