Electronics

Electronics

Phase velocity and group velocity

    • Navya C
      Ansys Employee
      Can anyone help me with how to differentiate phase velocity and group velocity?
    • rtk
      Ansys Employee
      Suppose, we add several waves together to create a resultant wave pattern. Each of these original waves can be of different velocity, amplitude and/or wavelength. So the velocity with which the phase of a single wave (original wave) travels is called phase velocity and the velocity of the resultant wave pattern refers to group velocity. Hope it addressed your concern!
    • Navya C
      Ansys Employee

      Thank you for the response.

      Is there any general relation between phase velocity and group velocity?

    • Charlotte Blair
      Ansys Employee

      Hi,

      The group velocity is directly proportional to the phase velocity and it differs for dispersive and non-dispersive waves. For non-dispersive waves, group velocity (Vg) is equal to the phase velocity (Vp) whereas, for dispersive waves Vg = Vp +k(dVp/dk), where is the angular wave number.


    • Navya C
      Ansys Employee
      That really helped. Thank you!
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