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How to analyze resistor of an RF coil?

Discussion in 'Electronic Design' started by Jim, Nov 21, 2004.

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  1. Jim

    Jim Guest

    I have an RF coil. Some material having strong absorption for 100MHz RF is placed
    inside the coil. X", size and position of the absortive meterial is known.
    How can I simulate the resistor of the RF coil at the specific frequency of 100MHz?
    Thank you very much!
     
  2. Don Pearce

    Don Pearce Guest

    Put a variable capacitor in series with the coil and resonate it with
    the inductor at 100MHz. What remains is now only the equivalent
    resistance to the lossy material. Measure this by placing the whole
    thing in parallel with a 100MHz signal and seeing how much it is
    reduced. Substitute fixed resistors to find the equivalent value.

    d

    Pearce Consulting
    http://www.pearce.uk.com
     
  3. Tim Wescott

    Tim Wescott Guest

    Do you want to simulate this on something like SPICE, simulate the
    conditions with a real coil in a real circuit, but without the
    absorptive material, measure the resistance, analyze the loss in the
    coil given the material characteristics, what?

    If you are going to run at exactly 100MHz and none other you can
    simulate this quite well by putting an appropriate resistance in
    parallel or in series with the coil, either in the real world or in your
    SPICE schematic. If you want it to be accurate for DC _and_ 100MHz then
    only the parallel resistance will do.

    But you really have to tell us more about what you're trying to do
    before we can help you.
     
  4. Jim

    Jim Guest

    Thank you both very much!
    My object is to optimize the coil structure to get maximum resistor
    change.

    I hope I can use some simulation method like FEM, FDTD etc. to analyze
    the relation of the resistor and coil structure.

    Thanks again!
     
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