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How to calculate the impedance

Posted Mar 22, 2013, 5:54 a.m. EDT Version 4.3a 4 Replies

Andrea Marie Scholl
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Hi everyone,

I'm trying to calculate the impedance after feeding my set-up with a constant voltage.
As I have frequency-dependent parameters (relative permittivity and conductance), I expect complex values.

Is there any option to right away calculate the impedance in COMSOL?
Or do I first have to calculate other values, e.g. current density?

My problem is that I can only find the options: Average, Integration, Maximum and Minimum as regards the simulated voltage plot.


Thank you!
4 Replies Last Post May 14, 2013, 5:47 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 22, 2013, 7:02 a.m. EDT
Hi

if you use the lumped ports / terminal you get the global values predefined

--
Good luck
Ivar
Hi if you use the lumped ports / terminal you get the global values predefined -- Good luck Ivar
Andrea Marie Scholl
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Posted: 1 decade ago Mar 22, 2013, 8:09 a.m. EDT
Thank you!

I was able to calculate resp. plot the impedance. But to my surprise it turned out to be constant...
As my potential is neither a constant according to my simulation, I'm a bit flabbergasted.

Do you by chance know whether COMSOL has any restrictions with the calculation of currents?
That would help me a lot!
Thank you! I was able to calculate resp. plot the impedance. But to my surprise it turned out to be constant... As my potential is neither a constant according to my simulation, I'm a bit flabbergasted. Do you by chance know whether COMSOL has any restrictions with the calculation of currents? That would help me a lot!
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 22, 2013, 8:14 a.m. EDT
Hi

check your BC settings, you might have missed something there, and dump more variables visa the derived variables to be sure the model really behaves as you expected ;)

I haven't really caught COMSOL with "severe" formula errors since back in 4.0, 4.1 time ;) So I tend to trust the latest versions

--
Good luck
Ivar
Hi check your BC settings, you might have missed something there, and dump more variables visa the derived variables to be sure the model really behaves as you expected ;) I haven't really caught COMSOL with "severe" formula errors since back in 4.0, 4.1 time ;) So I tend to trust the latest versions -- Good luck Ivar
Heshik Gowda
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Posted: 1 decade ago May 14, 2013, 5:47 a.m. EDT
Hi Ivar,
I am new to comsol, can you please help me how too plot impedance vs frequency plot.
Hi Ivar, I am new to comsol, can you please help me how too plot impedance vs frequency plot.

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