Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 62, Issue 5, Pages 2669-2678Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2014.2308549
Keywords
Complex-conjugate pole-residue pairs; Debye; Drude; finite-difference time domain (FDTD); linear dispersive materials; Lorentz; PLRC; recursive convolution; TRC
Funding
- U.K. Engineering and Physical Sciences Research Council (EPSRC)
- Defence Science and Technology Laboratory (Dstl)
- EPSRC [EP/H029397/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H029397/1] Funding Source: researchfish
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Two novel methods for implementing recursively the convolution between the electric field and a time dependent electric susceptibility function in the finite-difference time domain (FDTD) method are presented. Both resulting algorithms are straightforward to implement and employ an inclusive susceptibility function which holds as special cases the Lorentz, Debye, and Drude media relaxations. The accuracy of the new proposed algorithms is found to be systematically improved when compared to existing standard piecewise linear recursive convolution (PLRC) approaches, it is conjectured that the reason for this improvement is that the new proposed algorithms do not make any assumptions about the time variation of the polarization density in each time interval; no finite difference or semi-implicit schemes are used for the calculation of the polarization density. The only assumption that these two new methods make is that the first time derivative of the electric field is constant within each FDTD time interval.
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