This paper describes an efficient algorithm for compact passive macromodeling and sensitivity analysis of multiconductor transmission lines. The proposed method employs delay extraction prior to approximating the matrix exponential stamp of the line and guarantees macromodel passivity. An important advantage of the proposed approach is that the time-domain passive macromodel and its sensitivity with respect to per-unit-length parameters are obtained analytically.

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Conference PIERS 2004 - Progress in Electromagnetics Research Symposium
Nakhla, N. (Natalie), Dounavis, A. (Anestis), Achar, R, & Nakhla, M.S. (2004). Preserving passivity and causality in transmission line macromodels. In PIERS 2004 - Progress in Electromagnetics Research Symposium, Extended Papers Proceedings (pp. 429–432).