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Exporting complex electric field from mode solver

Posted Jul 16, 2012, 4:35 p.m. EDT RF & Microwave Engineering Version 4.0a 8 Replies

Min Seok Kim
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Hi all,

I am using mode analysis in RF module for obtaining a guided mode. (COMSOL 4.0a)

From the analysis, I tried to export field data and it seemed like it was giving me magnitude value instead of raw complex value.

For instance, if I tried to export x-component of E-field, say Ex(x,y) = Ex_real(x,y) + j Ex_imag(x,y), it seems like the data I am getting from COMSOL is sqrt( abs(Ex_real(x,y) + j Ex_imag(x,y)) ).

Does anyone know if I can export complex field values from mode analysis? not its magnitude?

Thanks!
8 Replies Last Post Sep 5, 2012, 11:18 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 Jul 17, 2012, 1:27 a.m. EDT
Hi

I believe it was already implemented in 4.0 then you can export the data set with real(Ex) and imag(Ex), but real nad imaginary part separately as 2 scalars

--
Good luck
Ivar
Hi I believe it was already implemented in 4.0 then you can export the data set with real(Ex) and imag(Ex), but real nad imaginary part separately as 2 scalars -- Good luck Ivar
Ryan
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Posted: 1 decade ago Jul 17, 2012, 1:45 p.m. EDT
You might want to check the exported file manually. When I export imaginary data, it exports as the number followed immediately by 'i' without any spaces or other characters; e.g. 4.0023*i exports as '4.0023i'. Many automated import scripts would recognize this number as '4.0023' (truncating the 'i') and not as '4.0023*i'.
You might want to check the exported file manually. When I export imaginary data, it exports as the number followed immediately by 'i' without any spaces or other characters; e.g. 4.0023*i exports as '4.0023i'. Many automated import scripts would recognize this number as '4.0023' (truncating the 'i') and not as '4.0023*i'.
Min Seok Kim
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Posted: 1 decade ago Jul 17, 2012, 1:54 p.m. EDT
Thank you Ivar,

Now I can obtain real and imaginary part separately.
Thank you Ivar, Now I can obtain real and imaginary part separately.
Min Seok Kim
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Posted: 1 decade ago Jul 17, 2012, 1:56 p.m. EDT
Thank you for your comment.

I imported it through Matlab and there was no "i" attached. Thanks for noting that!!
Thank you for your comment. I imported it through Matlab and there was no "i" attached. Thanks for noting that!!
Logan Bao
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Posted: 1 decade ago Sep 5, 2012, 10:01 a.m. EDT
hi how do you export the electric field from the mode solver? what i get has no imaginary part. can you tell me how to do that, looking forward to your reply!!thanks!

hualong
hi how do you export the electric field from the mode solver? what i get has no imaginary part. can you tell me how to do that, looking forward to your reply!!thanks! hualong
Logan Bao
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Posted: 1 decade ago Sep 5, 2012, 10:25 a.m. EDT
can you tell me how you get the imaginary part of the electric field,looking forward form you. thank you!
can you tell me how you get the imaginary part of the electric field,looking forward form you. thank you!
Min Seok Kim
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Posted: 1 decade ago Sep 5, 2012, 10:34 a.m. EDT
Hello,

I used real() or imag() in the evaluation section to extract complex field components.
For instance, if you want to extract real and imaginary part of Ex field, use real(Ex) and imag(Ex).


Hello, I used real() or imag() in the evaluation section to extract complex field components. For instance, if you want to extract real and imaginary part of Ex field, use real(Ex) and imag(Ex).
Logan Bao
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Posted: 1 decade ago Sep 5, 2012, 11:18 a.m. EDT
Hi Min,

first, many thanks!!

that means if want to extract the imaguinary data of Ex, the sentence i should write on comsol-matlab is following
yy=postplot(fem,'tridata',{'imag(Ey)','cont','internal','unit','V/m'},'solnum',index,'outtype','postdataonly');
then I can find my data in yy, is that right?

looking forward to your reply

Br,
hualong
Hi Min, first, many thanks!! that means if want to extract the imaguinary data of Ex, the sentence i should write on comsol-matlab is following yy=postplot(fem,'tridata',{'imag(Ey)','cont','internal','unit','V/m'},'solnum',index,'outtype','postdataonly'); then I can find my data in yy, is that right? looking forward to your reply Br, hualong

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