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This paper presented a novel unconditional stable FDTD (US-FDTD) algorithm for solving the transient response of uniform or nonuniform multiconductor transmission line with arbitrary coupling status. Analytical proof of unconditional stability and detailed analysis of numerical dispersion are presented. The precise split-time-step scheme has been introduced to eliminate the restriction of the Courant- Friedrich-Levy (CFL) condition. Compared to the conventional US- FDTD methods, the proposed approach generally achieves lower phase velocity error for coarse temporal resolution. So larger time scales can be chosen for the transient simulation to achieve accurate results e-ciently. Several examples of coupled uniform and nonuniform lines are presented to demonstrate the accuracy, stability, and e-ciency of the proposed model.

AN UNCONDITIONAL STABLE 1D-FDTD METHOD FOR MODELING TRANSMISSION LINES BASED ON PRECISE SPLIT-STEP SCHEME