Summary The present study examines the variation effects of incident plane wave on multiconductor shielded cables in frequency domains using Branin's method, which is referred to as the method of characteristics. The model operates in frequency and time domains with linear and nonlinear loads, respectively, which allows it to be easily introduced into circuit simulators, such as SPICE, Sabar, and ESACAP. Two examples are studied: coaxial shielded cables and shielded cables with two parallel wires (i.e., twinax cables), and they are both excited by an incident plane wave. The results obtained by this method are in agreement with those obtained by other methods. Copyright © 2015 John Wiley & Sons, Ltd.

This paper presents an optimization circuit model of multiconductor transmission lines in the time domain. Several methods allow calculation of the currents and the tensions distributed on the uniform transmission line. Most of these methods are limited to lines with constant losses, and only for linear loads. The macro-model we propose, using Pade approximant, employs more variables and allows it to reduce the necessary cells' number in modelization than the traditional cells cascade method. This macro-model, using the Modified Nodal Analysis method (MNA), is suitable for an inclusion in circuit simulator, such as Esacap, Spice, and Saber. The MNA method offers an efficient means to discretize transmission lines on real and complex cells compared to the conventional lumped discretization. In addition, the model can directly handle frequency-dependent line parameters in the time domain. An example, with experimental measures taken from literature, is presented to validate the model we propose, and show its importance. It is necessary for assuring the results validity obtained from Pade macro-model to study its stability and passivity.

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