Simulation of the absorbing clamp method for optimizing the shielding of power cables

Purpose – The purpose of this paper is to propose an efficient numerical simulation tool based on FEM, by which the EMC shielding effect characteristics of power cables can be predicted in the 30-1,000 MHz frequency range, as if it would be measured by the absorbing clamp method. Design/methodology/approach – The simulation method is based on decomposition: a 2D axisymmetric RF FE model is used for describing the whole measurement set-up, while a 3D quasi-static FE model is used for the symmetry cell of the shielding layer in order to capture the effect of its fine geometric details. Findings – Comparison with real measurements shows that the shielding characteristics can be reliably predicted this way, with some deviation in the low end of the frequency range though. Practical implications – This simulation tool can be applied in the design and optimization of braided cable shields to be used in the automotive industry. Originality/value – Two numerical models are coupled by the novel concept of “equivalent shielding layer”, which is obtained by homogenization.