• DocumentCode
    1492885
  • Title

    FDTD dispersion revisited: faster-than-light propagation

  • Author

    Schneider, John B. ; Wagner, Christopher L.

  • Author_Institution
    Dept. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA
  • Volume
    9
  • Issue
    2
  • fYear
    1999
  • fDate
    2/1/1999 12:00:00 AM
  • Firstpage
    54
  • Lastpage
    56
  • Abstract
    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
  • Keywords
    dispersion (wave); dispersion relations; finite difference time-domain analysis; light propagation; FDTD dispersion; coarsely resolved fields; exponential decay; faster-than-light propagation; finite-difference time-domain grid; numerical dispersion relation; phase velocity; spectral components; Arithmetic; Computer science; Differential equations; Dispersion; Finite difference methods; Frequency; Stability; Time domain analysis;
  • fLanguage
    English
  • Journal_Title
    Microwave and Guided Wave Letters, IEEE
  • Publisher
    ieee
  • ISSN
    1051-8207
  • Type

    jour

  • DOI
    10.1109/75.755044
  • Filename
    755044
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1492885