A multi-layered left-handed transmission line (LH-TL) composed of vertically stacked unit cells is proposed and demonstrated by the FDTD and FEM analysis. In addition, the composite right/left-handed (CRLH) equivalent circuit is used and the corresponding parameters are extracted to characterize the structure. The proposed LH-TL, including three unit cells, is extremely small (λ_0 /40 x λ_0 /40 x λ_0/57 @ 5GHz, conveniently shielded, and compatible with LTCC technology. Both the backward wave propagation and anti-parallel phase and group velocities are observed in the LH passband (extending from 3.32 GHz to 6.89GHz) with global phase advance from 509 ° to 87.5°. The possibility of exploiting the left-handed (LH) phase advance of this transmission line (TL) for dual-band microwave components is suggested.
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