Analysis and 3D Simulation of MnZn Inductors from 20 °C up to 120 °C

MnZn inductors are widely used in electromagnetic compatibility (EMC) to suppress electromagnetic interference (EMI). In real operating conditions, the temperature of MnZn cores can increase significantly. However, manufacturers and literature provide limited information about the temperature-dependent behavior of inductors and core materials over frequency. This paper investigates a MnZn core by measuring its complex permeability, complex permittivity, and impedance over frequency at discrete temperatures from 20°C to 120°C. Moreover, MnZn inductors experience strong electromagnetic coupling due to surrounding elements, which are challenging to consider through traditional circuit simulations. In this context, 3D full-wave simulation tools are emerging as a promising solution to take into account near-field electromagnetic couplings. This work novelly applies a small-signal inductor 3D simulation methodology to achieve accurate results up to 1 GHz under varying temperature conditions.