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A FEM Question

Posted 21 set 2020, 07:16 GMT-4 RF & Microwave Engineering, Results & Visualization, Studies & Solvers Version 5.4 2 Replies

Suad
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Hi,

I use COMSOL regularly but I don't know how the finite element method (FEM) works exactly. So, my question might be a bit awkward.

How can COMSOL draw a 2D or 3D Far Field plot for different number of angle values without recalculating the simulation? For example, when I increase the number of angles for a 2D Far Field radiation pattern, it just draws smoother plot and it doesn't need to run the simulation again.

Thank you.

2 Replies Last Post 21 set 2020, 08:22 GMT-4
Edgar J. Kaiser Certified Consultant
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Posted: 4 years ago 21 set 2020, 08:05 GMT-4

This is actually not really an FEM related question. The far field is calculated by the Stratton-Chu method which performs integrations on the outer boundary of the FEM domain to generate the far field. The method does not directly depend on the resolution of the FE boundary, but of course will be more accurate with a more accurate, i.e. better resolved FE result. You can find an abundance of literature on Stratton-Chu.

Cheer Edgar

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
This is actually not really an FEM related question. The far field is calculated by the Stratton-Chu method which performs integrations on the outer boundary of the FEM domain to generate the far field. The method does not directly depend on the resolution of the FE boundary, but of course will be more accurate with a more accurate, i.e. better resolved FE result. You can find an abundance of literature on Stratton-Chu. Cheer Edgar
Suad
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Posted: 4 years ago 21 set 2020, 08:22 GMT-4

Thank you Edgar,

As far as I understand, those graphs are plotted with the results calculated by using the solutions of the simulations.

Thank you Edgar, As far as I understand, those graphs are plotted with the results calculated by using the solutions of the simulations.

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