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Posted:
10 months ago
Jun 14, 2024, 8:51 a.m. EDT
In your simulation you have not created the internals for the leaded parts (the capacitors and the ferrite bead).
Your capacitors have to have all of the plates or the internal guts. This is not easy.
In any case I would suggest starting out with a 2D equivalent and work your way up to 3D. There is an example that should help you here
https://www.comsol.com/model/a-low-pass-and-band-pass-filter-using-lumped-elements-15675
In your simulation you have not created the internals for the leaded parts (the capacitors and the ferrite bead).
Your capacitors have to have all of the plates or the internal guts. This is not easy.
In any case I would suggest starting out with a 2D equivalent and work your way up to 3D. There is an example that should help you here
https://www.comsol.com/model/a-low-pass-and-band-pass-filter-using-lumped-elements-15675
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Posted:
9 months ago
Jun 20, 2024, 6:25 p.m. EDT
Thanks for the comments. I also asked from Consol Support. It looks like it's impossible to combine Electromagnetics Waves and Magnetic Field physics as both of them try to solve magnetic fields and it becomes hard for the solver. I had to keep most of the components lumped ones and definately I need 3D-model.
Thanks for the comments. I also asked from Consol Support. It looks like it's impossible to combine Electromagnetics Waves and Magnetic Field physics as both of them try to solve magnetic fields and it becomes hard for the solver. I had to keep most of the components lumped ones and definately I need 3D-model.
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Posted:
9 months ago
Jun 21, 2024, 12:07 p.m. EDT
You can use either mf or emw module but if it low frequency probably better to use mf or similar related physics. In either case you can use electrical circuit interface.
Modeling the ferrite bead is not that difficult provided that you have complex permeability data for the ferrite itself. If this is to mimic an existing SMT version then you have your work cut out. You would need to ask the vendor for ferrite material data.
Why do you need to know details of the capacitors? Unless you are designing them it is a lot of work and the mesh setup is more difficult. You could just use a dielectric box within the outer pkg that has ends as PECs and figure out dielectric constant to get wanted capacitance. Even meshing a ceramic capacitor with interleaving plates is difficult due to aspect ratio of the problem.
You can use either mf or emw module but if it low frequency probably better to use mf or similar related physics. In either case you can use electrical circuit interface.
Modeling the ferrite bead is not that difficult provided that you have complex permeability data for the ferrite itself. If this is to mimic an existing SMT version then you have your work cut out. You would need to ask the vendor for ferrite material data.
Why do you need to know details of the capacitors? Unless you are designing them it is a lot of work and the mesh setup is more difficult. You could just use a dielectric box within the outer pkg that has ends as PECs and figure out dielectric constant to get wanted capacitance. Even meshing a ceramic capacitor with interleaving plates is difficult due to aspect ratio of the problem.