Analysis on Nonlinear Characteristics of Electromagnetic Waves in a Ferrite Waveguide by FDTD Method

Hitoshi SHIMASAKI  Toshiro KODERA  Makoto TSUTSUMI  

IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.12   pp.1831-1837
Publication Date: 1998/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Computational Electromagnetics)
microwave,  nonlinear analysis,  ferrite,  FDTD method,  gyromagnetic equation,  

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This paper describes a new approach to analyze nonlinear characteristics of propagating waves in a ferrite material. As to the formulation of the wave in a ferrite medium, the analysis in this paper is not taken under the assumption of a sinusoidal steady state using Polder tensor permeability, but taken by directly differentiating the gyromagnetic equation in time domain without any linear approximations. Then it is combined with Maxwell equation in FDTD procedure. As a result, intensity-dependent nonlinear responses of the propagating wave are confirmed, and the nonlinearity is seen in only the right-hand polarization wave. It is also found that an effect of the damping term in the equation of the motion of the magnetization has nonlinear characteristics for wave propagation.