A simple method of approximating frequency characteristics of composites in a form convenient for time-domain numerical modeling is proposed. The frequency characteristics can be obtained from experiment or calculations based on the Maxwell Garnett mixing formalism. The resultant frequency characteristic might be of a complex shape corresponding to a combination of a number of absorption peaks. The approximation is made by a series of Debye-like terms using a genetic algorithm (GA). This leads to the necessity of taking a number of terms in the approximating series. Every term corresponds to its pole, i.e., the frequency where the maximum loss occurs. Some numerical examples are represented.
M. Koledintseva et al., "Representation of Permittivity for Multiphase Dielectric Mixtures in FDTD Modeling," Proceedings of the InternationalSymposium on Electromagnetic Compatibility, 2004, Institute of Electrical and Electronics Engineers (IEEE), Jan 2004.
The definitive version is available at http://dx.doi.org/10.1109/ISEMC.2004.1350047
InternationalSymposium on Electromagnetic Compatibility, 2004
Electrical and Computer Engineering
Keywords and Phrases
Debye-Like Terms; FDTD Modeling; Maxwell Garnett Mixing Formalism; Absorption Peaks; Approximating Series; Approximation Theory; Composites; Finite Difference Time-Domain Analysis; Frequency Characteristics; Genetic Algorithm; Genetic Algorithms; Inhomogeneous Media; Multiphase Dielectric Mixtures; Permittivity; Permittivity Representation; Pole; Poles and Zeros; Time-Domain Numerical Modeling
Article - Conference proceedings
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