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Solve for scattered field - perturbation of the precise solution?

Posted Sep 25, 2015, 2:56 p.m. EDT RF & Microwave Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions 4 Replies

Eugene Cheypesh
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Hi everyone!

I have a question about scattered field.

If I have background field and \some particles(or some another objects) in it.
I should than solve for scattered field.
But will it be a precise solution or just a perturbation?
What would be if I than put my solution as a new background field and try to solve problem again? Like *making a perturbation theory*
4 Replies Last Post Oct 1, 2015, 5:58 a.m. EDT
Sergei Yushanov Certified Consultant
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Posted: 9 years ago Sep 25, 2015, 3:53 p.m. EDT
Eugene,

Scattered field formulation gives you precise solution, not perturbation.
Total field (emw.Ex ) is a superposition of the background field (emw.Ebx) and scattered field (emw.relEx):
emw.Ex = emw.Ebx + emw.relEx

Regards,
Sergei
Eugene, Scattered field formulation gives you precise solution, not perturbation. Total field (emw.Ex ) is a superposition of the background field (emw.Ebx) and scattered field (emw.relEx): emw.Ex = emw.Ebx + emw.relEx Regards, Sergei
Eugene Cheypesh
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Posted: 9 years ago Sep 26, 2015, 2:41 a.m. EDT
Thanks a lot for your reply!

Although I have one more question then:
what will I get on my output? Total field? Or just scattered part of it?
Does it mean that I should add E_background and E_rel to get the whole solution or comsol does if for me?

Thanks a lot for your reply! Although I have one more question then: what will I get on my output? Total field? Or just scattered part of it? Does it mean that I should add E_background and E_rel to get the whole solution or comsol does if for me?
Sergei Yushanov Certified Consultant
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Posted: 9 years ago Sep 28, 2015, 8:33 a.m. EDT
Eugene,

When you select “Scattered field” formulation under root node “Electromagnetic Waves, Frequency Domain”, you need to specify “Background electric field”. There three options for Background wave type: 1) User defined; 2) Gaussian beam; 3) Linearly polarized plane wave.

Comsol calculated for you both total field and scattered field. You can find predefined variables for these fields under Equation View.

There are several examples in the Application Libraries with step by step instructions on scattered field formulation.

Regards,
Sergei
Eugene, When you select “Scattered field” formulation under root node “Electromagnetic Waves, Frequency Domain”, you need to specify “Background electric field”. There three options for Background wave type: 1) User defined; 2) Gaussian beam; 3) Linearly polarized plane wave. Comsol calculated for you both total field and scattered field. You can find predefined variables for these fields under Equation View. There are several examples in the Application Libraries with step by step instructions on scattered field formulation. Regards, Sergei
Eugene Cheypesh
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Posted: 9 years ago Oct 1, 2015, 5:58 a.m. EDT
Dear Sergei,

Thanks a lot for your attention to my question!
You helped me a lot
Dear Sergei, Thanks a lot for your attention to my question! You helped me a lot

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