DocumentCode :
1438448
Title :
Discrete finite-difference time domain impulse response filters for transparent field source implementations
Author :
Hadi, M.F. ; Almutairi, N.B.
Author_Institution :
Electr. Eng. Dept., Kuwait Univ., Safat, Kuwait
Volume :
4
Issue :
3
fYear :
2010
fDate :
3/1/2010 12:00:00 AM
Firstpage :
381
Lastpage :
389
Abstract :
Closed form discrete transfer functions are derived for finite-difference time domain (FDTD) grids in two- and three-dimensional (3D) space. The transfer functions can be used directly to synthesise the grid impulse response as part of modelling accurate and transparent embedded field sources in FDTD simulations. This approach eliminates the need for measuring grid impulse responses by end users from large and time consuming homogeneous unbounded simulations. The transfer functions were determined through designing fifth order infinite impulse response (IIR) digital filters using a combination of the Prony method and non-linear regression. It was found that the impulse response of equally spaced FDTD grids is independent of absolute values of temporal and spatial steps and rather depends only on the relative ratio of the used time step to the maximum allowed by the stability criterion. Sets of IIR filters are presented and validated for two-dimensional and 3D FDTD grids employing the standard as well as high-order FDTD update equations.
Keywords :
FIR filters; regression analysis; transfer functions; FDTD simulations; Prony method; closed form discrete transfer functions; discrete finite-difference time domain impulse response filters; fifth order infinite impulse response digital filters; grid impulse response; nonlinear regression; stability criterion; transparent field source implementations;
fLanguage :
English
Journal_Title :
Microwaves, Antennas & Propagation, IET
Publisher :
iet
ISSN :
1751-8725
Type :
jour
DOI :
10.1049/iet-map.2009.0029
Filename :
5430362
Link To Document :
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