Complex permeability broadband measurement and modeling of magnetic material

Parasite parameters caused by winding have negative impact on broadband complex permeability measurement. This paper identifies the effects of winding resistance, parasite capacitor and leakage inductance. The impact of each parasite parameter is quantitatively determined and an improved measurement method is proposed to mitigate the influence of the parasite parameters. Furthermore, commonly used complex permeability models are introduced. The Levy method and iterative rational function approaching (IRFA) method are used to extract model parameters. The proposed method has been applied to three different kinds of magnetic materials and satisfactory results have been obtained, which conforms the proposed measurement method and parameter extraction algorithms are suitable for building the small-signal model for magnetic materials.