A two-step indirect FDTD method for calculating anisotropic ferrite

In this paper, the author presented a two-step indirect FDTD method which can be used for processing magnetically anisotropic media, and then derived the iterative formula. According to the introduction of intermediate variables, this paper is divided into two parts by the specific form of frequency-domain permeability, and then the complex frequency-dependent entries can be replaced by new variables. First, the author derived the relationship of intermediate variables in the frequency domain, which is then transformed to the time domain, further the author deduced iteration formula of magnetic fields, so as to solve the complex magnetic constitutive relations. By this, we solved the electromagnetic field problems in ferrite successfully. As a verification, using the method the reflection coefficient and transmission coefficient of an infinite ferrite slab were calculated, the numerical results show that the method is simple and practical, which is easy to implement and saves computing time.