Abstract
AbstractThe coupling frequency range of the asymmetric coupler composed of a conventional microstrip right‐handed (RH) transmission line and a composite right/left‐handed (CRLH) transmission line with lumped‐elements is investigated. It shows theoretically that the coupling frequency range can be explicitly determined by the given formulas. In the coupling frequency range, the effective permittivity and permeability of the CRLH transmission lines are both negative, at the same time the product of the average permittivity and the average permeability is negative, i.e., ϵL < 0, μL < 0, and $\bar{\varepsilon}$ · $\bar{\mu}$ < 0. Two types of RH‐CRLH couplers are designed, simulated, and measured. The coupling frequency range obtained from the simulated and the experimental results confirms the theoretical results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2063–2068, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22643
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