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Study of FDTD Algorithm for Thin Dispersive Media Layers and Related Issues

Author: DongYuHang
Tutor: LiCunZhi；WeiBing
School: Xi'an University of Electronic Science and Technology
Course: Radio Physics
Keywords: FDTD ( finite difference time domain method ) Dispersive medium TLC Node correction
CLC: TN011
Type: Master's thesis
Year: 2009
Downloads: 78
Quote: 0
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Abstract


This paper systematically studied the finite difference time domain (FDTD: Finite-Difference Time-Domain) method, a thin coating of dispersive media deal with the problem. Improvement and promotion of Mikko et al method to adapt the electrical and magnetic dispersion dispersive medium thin case's handling. The weighted average of the effective medium parameters, and methods shift operator FDTD method combining proposed to deal with the problem dispersive medium thin coating General Calculation Method. MPI-based implementation SO (shift operator France)-FDTD parallel computing, and using this method to calculate the dispersion medium containing electrically large complex electromagnetic scattering problems. First, we discuss the case of one-dimensional FDTD electromagnetic Lorentz medium thin nodes fix the problem. Fixed point equivalent magnetic permeability coefficient within the dispersive medium by cellular permeability coefficient obtained a weighted average. Fixed point field dielectric constant to obtain the equivalent of two cases: (1) dispersive medium thin in a vacuum. Thus the equivalent dielectric constant of vacuum inside the cell and the dispersion medium dielectric constant to obtain a weighted average. (2) as the substrate metal thin dispersive medium. When the medium is greater than half a thin layer of cellular electric field correction point when the left and right half of the expansion of cellular get the equivalent dielectric constant of integration. When the medium is less than half a thin layer of cellular electric field correction point when the left and right of each one yuan intracellular integral method to get the equivalent dielectric constant. This method can also reflect the electrical, magnetic dispersion on the thin-layer reflection and transmission of the calculated results with the continued fraction method and the results of impedance boundary method coincide. Secondly, the weighted average method and the shift operator FDTD method is proposed by combining the processing of thin dispersive layer general calculation method. Drew model, Lorentz model, Debye model and other common model dispersive medium at the point in the amendment effective medium parameters can be obtained as described above. Taking into account the dispersion medium models in the frequency domain equivalent dielectric constant and effective permeability coefficient can be expressed as the independent variable in jω fractional polynomial form, combined with SO-FDTD method can be electric or magnetic field correction point at the time domain recurrence relation. Vacuum dielectric thin layer, a metal substrate dielectric thin two cases Numerical results show that the method is accurate, reliable and able to save a lot of memory space. Finally, based on the realization of the SO-FDTD parallel MPI network computing. Dispersive medium is given in case the program mode architecture, the message delivery mode. Parallel algorithm of metal and non-uniform plasma TV size composite electromagnetic scattering problems.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism
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