Boundary conditions for a coaxial cable

Discussion in 'Homework Help' started by Niles, Jan 5, 2009.

  1. Niles

    Thread Starter Active Member

    Nov 23, 2008
    56
    0
    Hi all.

    I am looking at a coaxial-cable, which starts at z=0 and ends at z=L, so it has a length L.

    At z=0 is it short-circuited, and at z=L there is an inductor connected. I need to find the boundary conditions that this gives me.

    For z=0 the potential V(0,t)=0, since R=0, and if V was not zero, then the current would be infinite. So this is all good.

    But at z=L I do not know what the boundary conditions are. Can you give me a push in the right direction?

    Thanks in advance.

    Sincerely,
    Niles.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    290
    That may have to do with the frequency of the applied signal. Think wavelength.
     
  3. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,061
    321
    http://www.ece.uci.edu/docs/hspice/hspice_2001_2-269.html

    Here's one of the better transmission line tutorials around. It might help to use the "lumped component" model to solve your problem.

    Eric
     
  4. Niles

    Thread Starter Active Member

    Nov 23, 2008
    56
    0
    Thanks to both of you.
     
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