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U.P.B. Sci. Bull., Series C
In this paper we present a general method of analysis used to determine the frequency domain in which any Composite Right Left Handed-CRLH structure behaves as a double negative medium, with both equivalent electric permittivity and magnetic permeability negative. This aspect is highly important when designing metamaterial transmission lines with multiband behaviour. In order to explain and validate this method, the most complex CRLH structure, which is the extended one (E-CRLH) is considered.fatcat:wkenvo4p5fc6pin3h3u67hhnbm