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Capacitive crosstalk between adiacent traces

Posted 26 mag 2011, 06:44 GMT-4 Low-Frequency Electromagnetics Version 4.0 3 Replies

Matteo Di Cosmo
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Hi,
I'm trying to simulate the crosstalk phenomenom between two adiacent lines using Comsol v4 .

The geometry is easy, one FR4 substrate, two conductors and the air. I use a 2D - electrostatic analysis.

I would like to get the capacitance per length value and for this I found several examples with Comsol 3.5 where It seems to be possible to get the capacitance value simply from the C11 variable.

Ho can I do this in Comsol 4 with a 2D geometry ?

Thank you very much,
Matteo







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3 Replies Last Post 25 giu 2011, 12:21 GMT-4
Matteo Di Cosmo
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Posted: 1 decade ago 26 mag 2011, 08:27 GMT-4
I get it, I should have used Terminal as Boundary condition on the first conductor.

I take out the substrate considering the capacitor filled from the air and the capacitance value seems to be incorrect, for a distance = 2.5 mm , a thickness of 2 mm and width = 0.1 i get 1.54e-10 F/m different from the value I find with C[F/m] = er*thickness/distance...

Any help?

Matte

Update: I just realized that this is the Capacitance Value..not the capacotance per unit length...so how Comsol calculates this capacitance?
I get it, I should have used Terminal as Boundary condition on the first conductor. I take out the substrate considering the capacitor filled from the air and the capacitance value seems to be incorrect, for a distance = 2.5 mm , a thickness of 2 mm and width = 0.1 i get 1.54e-10 F/m different from the value I find with C[F/m] = er*thickness/distance... Any help? Matte Update: I just realized that this is the Capacitance Value..not the capacotance per unit length...so how Comsol calculates this capacitance?

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L. Queval
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Posted: 1 decade ago 26 mag 2011, 10:13 GMT-4
Sorry I wasn't able to open the last model. Did you checked the out-of-plane thickness in the Electrostatic tab ?

EDIT: Did you checked this model www.comsol.com/community/exchange/95/ ?
Sorry I wasn't able to open the last model. Did you checked the out-of-plane thickness in the Electrostatic tab ? EDIT: Did you checked this model http://www.comsol.com/community/exchange/95/ ?
Matteo Di Cosmo
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Posted: 1 decade ago 25 giu 2011, 12:21 GMT-4
Hi, sorry for being late but I didn't notice the reply.

Here the project file. The capacitance value in a 2D problem should be per unit length, isn't it ?


Thanks,
Matteo
Hi, sorry for being late but I didn't notice the reply. Here the project file. The capacitance value in a 2D problem should be per unit length, isn't it ? Thanks, Matteo

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