DEVELOPMENT OF AN FDTD TOOL FOR MODELING OF DISPERSIVE MEDIA Part I. Material parameters and updating equations for fields

نویسندگان

  • Jianmin Zhang
  • Jing Wu
  • Marina Y. Koledintseva
  • James L. Drewniak
  • Konstantin Rozanov
چکیده

The implementation of the Debye, narrowband Lorentzian, and wideband Lorentzian dielectric and magnetic media in the numerical tool EZ-FDTD developed at the University of Missouri-Rolla (UMR is described. This tool allows efficient and robust full-wave finite-difference time-domain modeling of different complex electromagnetic structures. Algorithms for dispersive media use the linear recursive convolution (LRC) procedure. Fitting the experimentally obtained frequency characteristics of the materials by the Debye and Lorentzian dispersive laws is discussed. Criterion of which model is to be applied is introduced. The Debye model can be used, if the Q-factor of the linear circuit analogue of the corresponding Lorentzian model is less than 0.8. If 0.8 < Q < 1, then the wideband Lorentzian model is appropriate. For Q > 1, the narrowband Lorentzian model must be applied. The narrowband Lorentzian model is suitable for materials exhibiting resonance effects in the microwave frequency range. The wideband Lorentzian curve is typical for composites filled with conducting fibers, and also for many microwave magnetic materials.

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تاریخ انتشار 2005