SPICE-Based Lumped Circuit Model of Shielded Multiconductor Cables

This paper presents a lumped circuit model for a multiconductor coaxial cable with braided shielding placed over a ground plane. A field immunity test can be simulated with this model, in which the voltage response of an incident plane wave can be calculated. The bidirectional coupling between the inner and the outer system is taken into account, which allows the calculation of the emissions in the outer system. The cable is divided into segments at first. In a later step, equivalent circuit diagrams are created for each segment and connected together to represent the entire cable. The model can be used in the time and frequency domain. The validation was carried out by comparing the results of the developed model with those of field simulations.