Modeling of Nonuniform Magnetisation of a Ferrite Loaded Waveguide
The modelling of a ferrite material is conventionally carried out using the Polder permeability tensor which assumes that the ferrite is saturated by a uniform magnetic field. This assumption is often inaccurate due to the constraints imposed by boundary conditions which renders the magnetic field non-uniform. This work proposes to overcome this by determining the magnetic field through a magnetostatic solver and then computing the RF permeability of ferrite using its solution. A case study of a ferrite loaded nonreciprocal phase shifter is taken.