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How to calculate complex permittivity from complex conductivity

by carbon9
Tags: complex, conductivity, permittivity
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carbon9
#1
Aug3-14, 05:18 AM
P: 46
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.
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Greg Bernhardt
#2
Aug12-14, 03:56 PM
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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?
berkeman
#3
Aug12-14, 04:34 PM
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P: 41,324
Quote Quote by carbon9 View Post
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.
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

.

DrDu
#4
Aug13-14, 02:54 AM
Sci Advisor
P: 3,633
How to calculate complex permittivity from complex conductivity

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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