How to calculate line impedance?

Discussion in 'The Projects Forum' started by kodolsinteze, Oct 15, 2015.

  1. kodolsinteze

    Thread Starter New Member

    Oct 15, 2015
    2
    0
    Hello!
    I have a problem with finding out the impedance of a line.
    Im working on a project and i need to find out a way how to calculate(find out) the impedance of a given line not using time domain reflectometry.
    What measurements i have to do to find out the impedance using only frequency domain?
    The frequency range is from 100khz-2Ghz.
    Im out of ideas, any smarter people out there?
     
  2. Domophone

    Member

    Sep 10, 2013
    42
    0
    I think you need to provide a little more detail so people can help you. Are you calculating co-ax characteristic impedance, or a more generalized transmission line?
     
  3. kodolsinteze

    Thread Starter New Member

    Oct 15, 2015
    2
    0
    Oh, it's a microstrip.
     
  4. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    you use the dielectric constant of the substrate the wwidth, thickness and spacing of the conductors, and the strip line impedance formula.
     
  5. Domophone

    Member

    Sep 10, 2013
    42
    0
    A microstrip will have a pretty constant characteristic impedance over the frequency range you specified (less than 1% variation), just use one of many calculators online as a quick solution.
     
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