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Characteristics of the composite right/left-handed transmission lines

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3 Author(s)
Sanada, A. ; Electr. Eng. Dept., Univ. of California, Los Angeles, CA, USA ; Caloz, C. ; Itoh, T.

The composite right/left-handed (CRLH) transmission line (TL) is presented as a general TL possessing both left-handed (LH) and right-handed (RH) natures. The dispersion diagram of the two-dimensional (2-D) CRLH-TL is obtained analytically based on the Bloch-Floquet theory, and the unique phenomenon of infinite guided-wavelength propagation, with nonzero group velocity at a nonzero frequency, is explained. It is shown analytically that when the CRLH TL is "balanced", two eigenfrequencies at the Γ point (β=0) of the Brillouin zone (BZ) degenerate at ωΓ and a seamless transition from the LH to the RH modes without a bandgap can be achieved. In addition, these phenomena are demonstrated experimentally in the case of a CRLH microstrip line.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:14 ,  Issue: 2 )