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Model of planar capacitance

Posted 4 juil. 2018, 16:29 UTC−4 Electromagnetics, Low-Frequency Electromagnetics Version 5.3a 2 Replies

Richeek Dey
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Hi everyone, I'm new to COMSOL and I need to model this within 1 week, so please bear with me if my question sounds too stupid.

I'm designing a circuit where my parallel plate capacitance gets "opened" up into a co-planar capacitance. So to begin with, I am designing a parallel plate capacitor first. After watching a few videos, I understood that I have to first make a circuit and then model my capacitance in that circuit. To do this, I made an electric circuit with a voltage source V1, an External I vs U1, ground node 1. However, COMSOL keeps giving me an error saying "The DAE is structurally inconsistent". Is this because I have not specified a resistor? My circuit is purely capacitive, so why is it necessary to specify a resistance? And if so, what value of resistance do I have to put? My capacitor "plates" are made of copper and are squares with sides of 9cm. And the spacing between the capacitor plates is 9.5cm. Also, there is a guard ring around the receive plate of the capacitor plate, how do I add this to the model?

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2 Replies Last Post 5 juil. 2018, 04:23 UTC−4
Jens Krause
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Posted: 6 years ago 5 juil. 2018, 03:32 UTC−4
  • I think, Electrostatics (es) is better suited, you don't have currents flowing in the capacitance.
  • I do not understand the sphere in the geometry.
  • You want an air domain around the device.
  • Exploit symmetry!!!! You only need 1/16th

Regards

Jens

* I think, Electrostatics (es) is better suited, you don't have currents flowing in the capacitance. * I do not understand the sphere in the geometry. * You want an air domain around the device. * Exploit symmetry!!!! You only need 1/16th Regards Jens
Richeek Dey
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Posted: 6 years ago 5 juil. 2018, 04:23 UTC−4
  • I think, Electrostatics (es) is better suited, you don't have currents flowing in the capacitance.
  • I do not understand the sphere in the geometry.
  • You want an air domain around the device.
  • Exploit symmetry!!!! You only need 1/16th

Regards

Jens

Hi jen,

The sphere is supposed to represent air. Since I'm new to this, I used the webinar on RC modeling and was following that. Can you perhaps link me to a tutorial for electrostatics then? Or one where I can model capacitor?

>* I think, Electrostatics (es) is better suited, you don't have currents flowing in the capacitance. >* I do not understand the sphere in the geometry. >* You want an air domain around the device. >* Exploit symmetry!!!! You only need 1/16th > >Regards > >Jens Hi jen, The sphere is supposed to represent air. Since I'm new to this, I used the webinar on RC modeling and was following that. Can you perhaps link me to a tutorial for electrostatics then? Or one where I can model capacitor?

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