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FDTD dispersion revisited: faster-than-light propagation

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2 Author(s)
Schneider, J.B. ; Dept. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA ; Wagner, C.L.

The numerical dispersion relation that governs the propagation of fields in a finite-difference time-domain (FDTD) grid was derived several years ago. In this work a different interpretation is given for the governing equation. It is shown that the dispersion relation predicts faster-than-light propagation for coarsely resolved fields. Additionally, some spectral components that were previously believed to have zero phase velocity are shown to propagate, albeit with exponential decay

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:9 ,  Issue: 2 )