Conference Agenda

The paper deals with the analysis of the electromagnetic emission from a powertrain for automotive applications. A hybrid modelling approach is presented, based on the assumption that only the cable subsystem of the powertrain is known, whereas all the other components such as drives, inverters, and batteries are only known in terms of their nominal behavior. The hybrid approach is based on the experimental characterization of the components and on the full-wave simulation of the cable subsystem. All the subsystems are then represented in term of equivalent circuital multiport and a system-level circuital simulation is carried out to derive the high-frequency currents and voltages. These quantities are finally used to estimate the emissions from the powertrain. Benchmark with alternative models and with the experimental results show the effectiveness of the proposed methodology.

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.

The Finite Difference Time Domain (FDTD) method is widely used in EMC simulation of structures composed of complex conducting surfaces and volumes. In addition, the thin wire formalism provides to the FDTD method the ability to efficiently deal with complex wire network. In this paper, we propose a new full hybrid FDTD – MTL method to deal with cable bundles in their realistic environment, taking into account the complexity of the return current path by the FDTD method. The voltage reference of the cable cannot be equivalent between both methods: the in-cell FDTD coupling for the thin wire formalism and a classical reference ground plane into MTL method. Therefore, we introduce a new technique to do the reference change of the common mode in MTL method in order to let the FDTD method solve the common mode current in its complex structure modeling.

We present an accurate and efficient method for the modelling of wideband wire crosstalk. Our method is based on a macro basis function (MBF) scheme for the method of moments (MoM), to model electrically thin wires that are subject to proximity effects, where the proximity effects imply that the surface current density deviate substantially from the approximations typically used in the literature. We test our method on two crosstalk problems with wires above an infinite ground plane. We demonstrate that the method compares very well with the reference solution computed by a Rao-Wilton-Glisson (RWG) basis MoM solver for general surface geometries. In comparison to the RWG MoM, our method is capable of reducing the total number of degrees of freedom by roughly a factor of four. Also, we demonstrate that the conventional thin-wire MoM and transmission line theory (TLT) yield rather poor results for the test cases considered.