Hybridization of full-wave FDTD solver with a Multilevel Multiconductor Transmission Line solver with ngspice Interconnections

This article presents the hybridization of a 3D full-wave Finite-Difference Time-Domain (FDTD) solver with a multilevel multiconductor transmission line (MTL) solver, using the circuit simulator ngspice to treat TL interconnections. This schema is intended to study the electromagnetic response of 3D systems where networks of shielded cables are present. The MTL solver can simulate networks of shielded cable bundles with arbitrary topology. Bundles interconnects and terminations are described using ngspice. Interaction between different levels in the bundle is described by means of the transfer impedance of the cable shields.