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Journal of Electrical and Computer Engineering
Volume 2010, Article ID 303864, 5 pages
Research Article

Extended Composite Right/Left-Handed Transmission Line and Dual-Band Reactance Transformation

1Kunshan Industrial Technology Research Institute, 4F Technology Building, 1666 South Weicheng Road, Kunshan, Jiangsu 215347, China
2Department of Electrical and Systems Engineering, Washington University in St. Louis, One Brookings Drive, Box 1127, St. Louis, MO 63130, USA

Received 6 July 2009; Accepted 31 October 2009

Academic Editor: Hakan Kuntman

Copyright © 2010 Yuming Zhang and Barry Spielman. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An extended composite right/left-handed transmission line is introduced, and its dual-band bandpass filter characteristics are explored. Novel reactance transformations, derived from this transmission line, are formulated to transform a low-pass prototype filter into a dual-band bandpass filter with arbitrary dual pass bands, well-defined in-band attenuation ripples, and high out-of-band rejection. The physical insight into such a dual-band bandpass filter is provided with a dispersion analysis. The transformations are verified by simulated results for dual-band bandpass filters.