Modeling absorbing materials for EMI mitigation

In this study, the parameters of magnetic absorbing materials were measured and used to predict their effectiveness at reducing total radiation power from a heat sink. The parameters of absorbing materials were measured using a transmission line method and fitted using the Debye model. By comparing S-parameters and power loss between a simulated and measured microstrip line, the fitted material parameters were validated. The heat sink model has also been investigated to determine the radiation mitigation with lossy materials.

I. Introduction

Absorbing materials, commonly referred to as lossy materials, are widely used in practical engineering areas. Lossy materials can be used for electromagnetic noise suppressing or emission suppressing in electronic devices or systems in order to satisfy the standards of electromagnetic compatibility [1]–[2].