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complex relative permittivity

Posted Jun 17, 2010, 12:54 p.m. EDT 2 Replies

Claire Sweetenham
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I need to enter a complex relative permittivity into material settings - can I do this and if so, how? The value is -9.96+0.82i.

Many thanks.
2 Replies Last Post Mar 27, 2013, 1:48 a.m. EDT
Bryan Reed
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Posted: 1 decade ago Jun 17, 2010, 6:40 p.m. EDT
Yes, just enter it as the value for epsilonr and it should work.

But be aware that COMSOL uses the opposite convention for imaginary parts that a lot of the literature uses, such that a lossy material has a negative imaginary part of epsilon. So you should probably enter -9.96-0.82i.

Yes, just enter it as the value for epsilonr and it should work. But be aware that COMSOL uses the opposite convention for imaginary parts that a lot of the literature uses, such that a lossy material has a negative imaginary part of epsilon. So you should probably enter -9.96-0.82i.
Andrea Marie Scholl
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Posted: 1 decade ago Mar 27, 2013, 1:48 a.m. EDT
Does COMSOL define the complex relative permittivity in every version, especially in 4.3, as

epsilon = epsilon_real - j*repsilon_imag ?


I had to create a lookup table for my simulation and initially typed in
epsilon = epsilon_real - j*repsilon_imag .

Now I'm wondering whether it should not have been
epsilon = epsilon_real + j*repsilon_imag .
Does COMSOL define the complex relative permittivity in every version, especially in 4.3, as epsilon = epsilon_real - j*repsilon_imag ? I had to create a lookup table for my simulation and initially typed in epsilon = epsilon_real - j*repsilon_imag . Now I'm wondering whether it should not have been epsilon = epsilon_real + j*repsilon_imag .

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