Accurate extrapolation to zero cell size by Padé approximation
✍ Scribed by Pär Ingelström; Love Lindholm; Thomas Rylander
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 185 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0894-3370
- DOI
- 10.1002/jnm.499
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✦ Synopsis
Abstract
It is shown that extrapolation to zero cell size can be made accurately by means of Padé approximation. The extrapolation procedure is tested on waveguide cavity filters analysed by the finite difference‐time domain (FDTD) scheme. Extrapolation by the traditional Taylor series can yield unphysical results in the vicinity of resonances where it is outperformed by extrapolation based on the Padé approximation. Direct computation with the FDTD scheme (without extrapolation) requires extreme and infeasible resolutions to achieve a reasonable accuracy close to resonances. Copyright © 2003 John Wiley & Sons, Ltd.