Three-dimensional finite element analysis of ferrite devices including spatial inhomogeneity of the permeability tensor

This paper presents a full wave vector finite element analysis of microwave devices that utilize gyrotropic ferrite materials. The ferrite permeability tensor´s dependence upon the magnetostatic bias field is accounted for by determining the static fields using a three-dimensional finite element magnetostatic solver. This accounts for non-uniform demagnetization and the resulting spatial inhomogeneities in the full-wave high-frequency computations. Comparisons are made between the calculated S-parameters of a microstrip circulator and measured S-parameters.