3D modelling and analysis of parasitic couplings between surface-mount components of EMI filters

In this paper 3D electromagnetic modelling of surface-mount components of EMI filters is presented. Developed models in CST MWS are used to analyze parasitic couplings between surface-mount inductors and surface-mount inductors and capacitors. The couplings are evaluated in terms of transmission coefficients. Modelling results are then verified experimentally over wide frequency range. The models can be fairly useful to predict the mutual couplings in the frequency range from several MHz to several tens of MHz.