Abstract: A dual structure of composite right/left handed (CRLH) transmission line (TL) is analyzed in which an inductance L_R is in parallel with a capacitance C_L and a shunt capacitance C_R is in series with an inductance L_L. Both the distributed and lumped cases are considered. The dispersion diagram and transmission properties of the dual CRLH TL are given and compared with those of a standard CRLH TL. Contrary to the frequency response of a standard CRLH TL, a dual CRLH TL has a left-handed (negative phase shift) band at higher frequencies and a right-handed (positive phase shift) band at lower frequencies. A novel dual-band balun is presented as an application.

Key words: Dual structure, Composite right/left handed transmission line (CRLH TL), Dual band balun

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