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Current loop matching filter optimization...

Discussion in 'Electronic Design' started by Fred Bartoli, Aug 27, 2012.

  1. Fred Bartoli

    Fred Bartoli Guest

    I have a current loop "antenna" (design supplied by the customer) that's
    tuned to, guess, 50R :)


    C2 L
    ----+----||----UUUUU----.
    | |
    | |
    === C1 R esr
    | R
    | |
    GND GND


    The esr resistance and L inductance are the current loop plus some added
    resistance.

    Now the environment is somewhat uncontrolled (conductors,...) and the
    inductance is allowed to change quite a bit (circa 5%) which plays bad
    games with the matching and I'm trying to find some design that limit
    input sensitivity to the L parameter.

    Since the smith plot with the distance to the perturbing conductors as
    the parameter almost retraces the frequency plot I had a look into
    wideband matching (Bode-Fano,...) but I now think this leads no where...

    I guess this pb has been addressed by the RFID guys or possibly MRI too
    but can find no useful hint.

    Any info/hint/link/idea is welcomed...
     
  2. Guest

    probably more in this that you ever wanted to know.

    http://books.google.dk/books/about/...l_and_Biome..html?id=to_3sGPIBQQC&redir_esc=y



    -Lasse
     
  3. Fred Bartoli

    Fred Bartoli Guest

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