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http://dx.doi.org/10.5515/KJKIEES.2011.22.2.191

Approximate Method of Multi-Layer Green's Function Using FDTD Scheme and Rational Function Approximation  

Kim, Yong-June (Department of Electrical and Electronic Engineering, Yonsei University)
Koh, Il-Suek (Department of Electronic Engineering, Inha University)
Lee, Yong-Shik (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Abstract
In this paper, a method to approximate a multi-layer Green's function is proposed based on a FDTD scheme and a rational function approximation. For a given horizontal propagation wavenumber, time domain response is calculated and then Fourier transformed to the spectral domain Green's function. Using the rational function approximation, the pole and residue of the Green's function can be estimated, which are crucial for a calculation of a path loss. The proposed method can provide a wideband Green's function, while the conventional normal mode method can be applied to a single frequency problem. To validate the proposed method, We consider two problems, one of which has a analytical solution. The other is about multi-layer case, for which the proposed method is compared with the known normal mode solution, Kraken.
Keywords
FDTD; Rational Function Approximation; Multi-Layer Green's Function;
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