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Impedence and reflection

  1. Dec 8, 2013 #1
    why does a change in impedance causes reflection? I know that R=(Z2-Z1)/(Z1+Z2), but what is it that makes the wave be reflected?

  2. jcsd
  3. Dec 8, 2013 #2


    Staff: Mentor

    Basically it comes from energy conservation. At an interface of difference impedances not all of the energy will be transmitted beyond the interface. Since energy must be conserved, whatever is not transmitted must be reflected.
  4. Dec 13, 2013 #3

    Claude Bile

    User Avatar
    Science Advisor

    An alternate, but equivalent explanation to Dale's, is that reflection occurs so as to satisfy the boundary conditions at the interface.

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