Abstract
The new concept of dual extended composite right/left-handed transmission line (D-ECRLH TL), with 2 right handed and 2 left handed frequency bands is presented. The D-ECRLH TL and extended composite right/left handed transmission line are structurally dual. Therefore, the proposed TL shows the dual properties of the ECRLH TL. The D-ECRLH indeed behaves as a dual-band bandstop filter, in opposition to the ECRLH which is a dual-band bandpass one. In contrast, the D-ECRLH creates an unlimited LH bandwidth. In this article, the transmission parameters and the fundamental properties of the D-ECRLH TL (dispersion and impedance diagrams) are investigated. The results show that the proposed structure is suitable to design the quad-band microwave circuits and systems. A prototype of the proposed D-ECRLH unit cell is realized by the microstrip technology. The good agreement between the measurement and simulation results confirms the realizability of the proposed structure.
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