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Capacitance and Q

Discussion in 'Electronic Design' started by amdx, May 1, 2007.

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  1. amdx

    amdx Guest

    Please add to the discussion on;
    rec.radio.amateur.antenna

    The subject line is--- Distributed capacitance effects Q?

    The question is, does additional interwinding capacitance increase
    losses in an inductor.

    Mike
     
  2. John Larkin

    John Larkin Guest

    Additional compared to what? You can't very well compare a given coil
    geometry to that same geometry without winding capacitance!

    Oh, I read somewhere recently that "interwinding" capacitance is, at
    least in single-layer coils, usually tiny compared to coil-to-universe
    capacitance. That makes sense, since the voltage between turns is
    usually small.

    John
     
  3. LVMarc

    LVMarc Guest

    losse are propotionally and incremeantal additons of the actual
    resitnace of the wire.. the real culprit with added winding is inter
    widing capciatace, as small as it may be, each loop adds more stray cap
    blues, and the result is a lower selfresonsnce. this ultimatley limits
    the useful frequency range of that inductor..all a proportion balancing
    act, as always

    Marc
     
  4. jasen

    jasen Guest

    I guess it depends on dielectric losses.

    AIUI, parasitic capacitance is just like an external capacitor.

    Bye.
    Jasen
     
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