Theoretical and experimental determination of the permeability tensor components of magnetized ferrites at microwave frequencies

We compare the diagonal (mu) and off-diagonal (kappa) permeability tensor components of magnetized polycrystalline ferrites given by the theoretical model of Gelin and Berthou with experimental ones at microwave frequencies. We used a broadband and noniterative measurement technique recently developed within our research group. Whatever the ferrite magnetization state is, simulated and measured (mu) and (kappa) points agree well. This study provides an experimental validation of the Gelin-Berthou model. Moreover, by using this characterization method, we show how the measurement of the magnetic properties can be affected by the size of the ferrite sample under test.