Abstract
A novel finite-difference time-domain algorithm for modeling ultrawideband electromagnetic pulse propagation in arbitrary multirelaxed dispersive media is presented. The proposed scheme is based on a general, yet computationally efficient, series representation of the fractional derivative operators associated with the permittivity functions describing the frequency dispersion properties of a given dielectric material. Dedicated uniaxial perfectly matched layer boundary conditions are derived and implemented in combination with the basic time-marching scheme. Moreover, a total field/scattered field formulation is adopted in order to analyze the material response under plane-wave excitation. Compared with alternative numerical methodologies available in the scientific literature, the proposed technique features a significantly enhanced accuracy in the solution of complex electromagnetic propagation problems involving higher order dispersive dielectrics, such as the ones typically encountered in geoscience and bioengineering applications.
Original language | English |
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Article number | 7486999 |
Pages (from-to) | 3533-3544 |
Number of pages | 12 |
Journal | IEEE Transactions on Antennas and Propagation |
Volume | 64 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Aug 2016 |
Keywords
- Dielectric relaxation
- dispersive media
- enhanced weighted quantum particle swarm optimization (EWQPSO)
- finite-difference time domain (FDTD)
- fractional calculus
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering