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New scheme for introducing an oblique incidence plane wave to layered media in finite-difference time-domain

Jiang Yan-Nan Ge De-Biao

New scheme for introducing an oblique incidence plane wave to layered media in finite-difference time-domain

Jiang Yan-Nan, Ge De-Biao
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  • Abstract views:  3805
  • PDF Downloads:  1939
  • Cited By: 0
Publishing process
  • Received Date:  29 September 2007
  • Accepted Date:  12 February 2008
  • Published Online:  20 October 2008

New scheme for introducing an oblique incidence plane wave to layered media in finite-difference time-domain

  • 1. 西安电子科技大学物理系,西安 710071

Abstract: In the application of two-dimensional finite-difference time-domain (2D-FDTD) method to the analysis of scattering by an object embedded in layered media,the obliquely incident wave along the total field-scattered field (TF-SF) contains the incidence pulse and the reflected and multiple-reflected wave,which can not be introduced by use of the traditional method. To solve this problem,a hybrid scheme using different ways to treat the four TF-SF boundaries is presented. The modified 1D-FDTD including oblique incidence angle is used to treat the longitudinal side boundaries,which can produce the reflected and multiple-reflected wave to layered interface automatically. The longitudinal side boundaries are extended downwards,such that the TF-SF lower boundary is located in the perfectly matched layer (PML) completely,thus the transmission wave and scattered wave are both outward-going waves in the lowest PML layer,and are absorbed by PML. The TF-SF upper boundary is located in free space; the incidence wave along it is in fact a properly time-delayed duplication of the waveform at the corner of TF-SF upper longitudinal boundary. The computational results show the reliability and applicability of the presented hybrid scheme.

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