Characterization of ferrites using a fully loaded waveguide system

We developed a single and compact fully-loaded waveguide system to characterize the electromagnetic properties of ferrites. A standard characterization procedure with four steps to increasing accuracy is proposed. A preliminary complex permittivity was extracted using the Nicolson-Ross-Weir method in the absence of the bias, while a preliminary saturation magnetization was determined by the ferromagnetic resonant frequency in the presence of the bias. Based on these preliminary data, a suitable bias that guarantees minimum errors can be chosen. Finally, we can retrieve the exact ferrimagnetic parameters, including the saturation magnetization and the linewidth under the consideration of the modal effect and the correction of the intrinsic magnetization. Four samples with distinctive electromagnetic characteristics were tested, and the results agree well with the HFSS simulations and the specifications offered by the vendors.