A high-resolution interpolation at arbitrary interfaces for the FDTD method

In recent years, the finite-difference time-domain (FDTD) method has found numerous applications in the field of computational electromagnetics. One of the strengths of the method is the fact that no elaborate grid generation specifying the content of the problem is necessary-the medium is specified...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1998-11, Vol.46 (11), p.1759-1766
Main Authors: Nadobny, J., Sullivan, D., Wust, P., Seebass, M., Deuflhard, P., Felix, R.
Format: Article
Language:English
Subjects:
Character generation
Computational electromagnetics
Finite difference methods
Finite element methods
Interpolation
Lattices
Material properties
Maxwell equations
Mesh generation
Time domain analysis
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Summary:In recent years, the finite-difference time-domain (FDTD) method has found numerous applications in the field of computational electromagnetics. One of the strengths of the method is the fact that no elaborate grid generation specifying the content of the problem is necessary-the medium is specified by assigning parameters to the regularly spaced cubes. However, this can be a weakness, especially when the interfaces between neighboring media are curved or "sloped" and do not exactly fit the cubic lattice. Since the E- and H-fields are only calculated at the regular intervals, sharp field discontinuities at the interfaces are often missed. Furthermore, the averaging of the material properties often leads to significant errors. In this paper, a post-processing method is presented, which approximates the correct field behavior at the interfaces by interpolating between the FDTD calculated values, splitting them into the components normal and tangential to the interfaces, and then enforcing the interface conditions for each of these components separately.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.734576