The time-domain analysis of field-excited lossy transmission line (TL) networks with nonlinear loads is based on the nodal approach in the time-domain. The computation of the nodal admittance or impedance matrix coefficients of the linear part of the network is required in the frequency-domain, in order to obtain the corresponding transient functions by the inverse discrete Fourier transform (DFT). The model-based parameter estimation (MBPE) technique is applied to improve the efficiency of the method in case of large-dimension configurations. The developed procedure allows to represent transcendent functions over very wide bandwidths by using only the coefficients of their rational approximating functions. Good accuracy and considerable reduction of the computation-time are achieved. The EMP-induced effects on three signal mesh-type networks, having increasing geometrical complexity, with nonlinear loads, are calculated in order to assess the efficiency of the proposed method.
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