How to calculate complex permittivity from complex conductivity

  1. Hi,

    I got the complex conductivity vs. frequency table of a metamaterial. Its first lines are like this:

    f conductivity
    1GHz 0.004+0.00297i
    1.1GHz 0.004+0.00295i
    1.2GHz 0.003+0.00294i

    the table goes up to 10GHz.

    Now the problem is that I need to enter this material into electromagnetic simulation tools. But these tools require a real permittivity and frequency dependent loss tangent (CST and HFSS). So how can I calculate complex permittivity (real permittivity and loss tangent) from the above data?

    Thanks in advance.
     
  2. jcsd
  3. Greg Bernhardt

    Staff: Admin

    I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?
     
  4. berkeman

    Staff: Mentor

    I'm no expert in the field, but conductivity and permittivity would seem to be fairly orthogonal properties. Have you tried finding a table of permittivity for this material?

    http://en.wikipedia.org/wiki/Electrical_conductivity

    http://en.wikipedia.org/wiki/Permittivity

    .
     
  5. DrDu

    DrDu 4,092
    Science Advisor

    The problem is that there are many different conventions out there, but I would guess that in your case ##\epsilon =\epsilon_0+\frac{i}{\omega} \sigma##.
     
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