Interpolation techniques to improve the accuracy of the plane wave excitations in the finite difference time domain method
Author
Oğuz, U.
Gürel, Levent
Date
1997-11Source Title
Radio Science
Print ISSN
0048-6604
Publisher
Wiley-Blackwell Publishing, Inc.
Volume
32
Issue
6
Pages
2189 - 2199
Language
English
Type
ArticleItem Usage Stats
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Abstract
The importance of matching the phase velocity of the incident plane wave to the numerical phase velocity imposed by the numerical dispersion of the three-dimensional (3-D) finite difference time domain (FDTD) grid is demonstrated. In separate-field formulation of the FDTD method, a plane wave may be introduced to the 3-D computational domain either by evaluating closed-form incident-field expressions or by interpolating from a 1-D incident-field array (IFA), which is a 1-D FDTD grid simulating the propagation of the plane wave. The relative accuracies and efficiencies of these two excitation schemes are compared, and it has been shown that higher-order interpolation techniques can be used to improve the accuracy of the IFA scheme, which is already quite efficient.
Keywords
Finite difference methodInterpolation
Three dimensional
Time domain analysis
Velocity
Finite difference time domain method
Phase velocity
Electromagnetic wave propagation