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Modelling dispersive dielectrics in TLM method

✍ Scribed by I. Barba; A. C. L. Cabeceira; M. Panizo; J. Represa

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 195 KB
Volume: 14
Category: Article
ISSN: 0894-3370
DOI: 10.1002/1099-1204(200101/02)14:1<15::aid-jnm393>3.0.co;2-j

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✦ Synopsis

The TLM method, being a time domain method, cannot deal directly with frequency dispersive media. A way for modelling such media, for instance, dielectric dispersive ones, is proposed, starting from the causality relationship between "eld vectors D and E, which is discretized over the same space}time mesh as the three-dimensional TLM mesh (in our case, with HSCN node). This leads to adding, at each node on the network, three voltage sources (one for each "eld component), their value depending on the previous instants. The method is validated by computing the re#ection (magnitude and phase) coe$cient at normal incidence at an air}dielectric interface, for di!erent dispersive behaviours of the dielectrics.

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