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What'a difference between TEM wave and plane wave?

  1. Apr 15, 2015 #1
    Hello
    what'a difference between tem wave and plane wave?
    I think in tem is the same as plane wave but it's electromagnetic amplitude decrease ,is it right?if yes how does amplitude decrease?
     
    Last edited by a moderator: Apr 15, 2015
  2. jcsd
  3. Apr 15, 2015 #2

    berkeman

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    Staff: Mentor

    What makes you think they are different? What definitions have you found in your reading?
     
  4. Apr 15, 2015 #3
    Hello
    Thank you for your response
    because of different reasons:
    1)if they are the same why we use different definition
    2)when we want to derive helmholtz equation we declare it for Plane wave not TEM
    3)if they are the same why we tell them in some transmission line(such as coaxial) TEM not plane wave

    any help would greatly appreciate
     
  5. Apr 15, 2015 #4

    berkeman

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    Staff: Mentor

    I'm not familiar with any differences. This entry at wikipedia implies they are the same: http://en.wikipedia.org/wiki/Wave_impedance

    Can you post a link to the Helmholtz equation reference that seems to make a distinction?
     
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