A NEW FDTD ALGORITHM FOR THE STUDY OF FERRITE WITH A NEGATIVE EFFECTIVE PERMEABILITY

Ferrite materials are used in many microwave devices (circulators, iso lators...) which. work in a frequency range where the effective permea bility mu eff 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 mu eff is positive, The behaviour of the ma terial is completely 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 mu eff is negative. It is validated by computati on of resonant frequencies and fields patterns of a ferrite resonant s tructure.