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Ferrite materials are used in many microwave devices (circulators, isolators ...) which work in a frequency range where the effective permeability µeff of the ferrite can be either positive or negative. Many authors [1], [2] and [3] have applied the F.D.T.D. method to the study of saturated ferrite when µeff is positive. The behaviour of the material is completly different when its effective permeability becomes negative [4]. In this paper a new 2D F.D.T.D. algorithm is developed to study ferrite when µeff is negative. It is validated by computation of resonant frequencies and fields patterns of a ferrite resonant structure

A New F.D.T.D. Algorithm for the Study of Ferrite with a Negative Effective Permeability