Menu

Discussion Forum

New Discussion
Filtra

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Comsol RF module norm and phase

Posted 3 mar 2013, 16:54 GMT-5 RF & Microwave Engineering Version 4.3a 6 Replies

Ning Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Dear all,

I have a problem with Comsol, a very naive one.

I am trying to do a harmonic simulation (a single frequency in frequency domain model) of the EM scattering in a domain.

For example if I have a electric dipole oscillating in a square medium. I will be able to get the norm of the electric field at any spatial point in the simulated domain by selecting the norm option in Comsol. However I am also interested in finding out the relative phase relationship between the electric field at different spatial points. If there a easy way to do it say by selecting any function in the Comsol simulation ?

All the best
6 Replies Last Post 4 mar 2013, 14:06 GMT-5
Edgar Kaiser
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 3 mar 2013, 18:19 GMT-5
Hi,

look at the spatial components of the electric field. They are complex. You may have to use the real() and imag() operators.

Cheers
Edgar
Hi, look at the spatial components of the electric field. They are complex. You may have to use the real() and imag() operators. Cheers Edgar
Ning Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 3 mar 2013, 18:22 GMT-5
Thank you Edgar,

I did not find the phase (complex) option in the Comsol interface so
I assume now if I export these field numbers into matlab they will be complex
Is that correct ?

Thank you so much for your reply
Thank you Edgar, I did not find the phase (complex) option in the Comsol interface so I assume now if I export these field numbers into matlab they will be complex Is that correct ? Thank you so much for your reply
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 4 mar 2013, 01:09 GMT-5
Hi

you should check the help "mathematical functions" and "special operators", there you can fine the imag() real() arg atan2(,) ... and many more

--
Good luck
Ivar
Hi you should check the help "mathematical functions" and "special operators", there you can fine the imag() real() arg atan2(,) ... and many more -- Good luck Ivar
Shakeeb Bin Hasan
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 4 mar 2013, 06:07 GMT-5
Ivar is right, try atan(imag()/real()) and you get the phase
Ivar is right, try atan(imag()/real()) and you get the phase
Ning Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 4 mar 2013, 06:10 GMT-5
Thank you for your reply, I will check it out

Best wishes
Thank you for your reply, I will check it out Best wishes
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 4 mar 2013, 14:06 GMT-5
Hi

to get the full 2*pi rad turn use rather

arg( your_compl_var )

or

atan2( imag(your_compl_var) , real(your_compl_var) )

and NOT atan(.../...) that is limtied to 0-pi rad


--
Good luck
Ivar
Hi to get the full 2*pi rad turn use rather arg( your_compl_var ) or atan2( imag(your_compl_var) , real(your_compl_var) ) and NOT atan(.../...) that is limtied to 0-pi rad -- Good luck Ivar

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content