Since simulations of broadband applications have gained importance in recent years, stable and efficient time domain methods are needed which in particular consider realistic modeling of complex material properties. Thus for many microwave applications like circulators or one-way transmission devices the dispersive and anisotropic character of gyrotropic media is of great significance. On the basis of general system theory the extension of the Finite Integration Technique to gyromagnetic material behavior is presented, in combination with a modified stability analysis. The applicability of the presented method is demonstrated by a broadband simulation of an H-plane waveguide circulator.
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