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Transmission Line Impedance Matching

  1. Sep 23, 2011 #1
    In the case of a complex source impedance ZS and load impedance ZL, maximum power transfer is obtained when ZS = ZL*.

    For a lossless transmission line terminated on one end with a purely resistive load, zero reflection is obtained when ZS=ZL.

    What about the case of a lossy transmission line, which has complex impedance? For minimum reflection, do we want ZS=ZL or ZS=ZL*? Is zero reflection possible for this case?

    Thanks for the help!
     
  2. jcsd
  3. Sep 24, 2011 #2

    NascentOxygen

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    Staff: Mentor

    Maximum energy transfer would seem to be synonymous with no energy reflected.

    .... but I'm just speculating.
     
  4. Sep 24, 2011 #3
    Yes. The source would have to be matched to the complex impedance of the transmission line it sees. Likewise the load would have to be matched to the complex impedance of the transmission line it sees.
     
  5. Sep 24, 2011 #4

    NascentOxygen

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    Staff: Mentor

    There remains ambiguity re the meaning in this context of the word "matched".
     
  6. Sep 24, 2011 #5
    Would you be happier if I changed it to "conjugately matched"?
     
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