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Electric Field and Equipotential Surface Simulation Problem

Posted Feb 25, 2020, 10:43 p.m. EST Electromagnetics, Semiconductor Devices 5 Replies

Akshay Sahota
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Hi, I am a new user to COMSOL. Can anyone help me, please? I want to compute and plot the electric field intensity and the equipotential surfaces produced by two parallel plates at their midway and at a point closer to any one of the plates (if it's possible to simulate at points of our own choice). The plates are separated by a distance “d”. The upper one has a potential of +V and the lower -V. Any help would be much appreciated. Thank you in anticipation!

5 Replies Last Post Mar 4, 2020, 6:28 p.m. EST
Jeff Hiller COMSOL Employee

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Posted: 5 years ago Feb 26, 2020, 8:32 a.m. EST
Updated: 5 years ago Feb 27, 2020, 3:28 p.m. EST

Hello Akshay,

This tutorial on modeling a parallel plate capacitor should be fairly similar to what you have in mind, and will help you get going. This model is also closely related and has a more interesting, 3D, geometry.

To learn how to operate the software in a more structured manner, I strongly recommend the Learning Center. Many additional self-training resources are listed in my post this recent thread.

Best regards,

Jeff

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Jeff Hiller
Hello Akshay, This tutorial on modeling a [parallel plate capacitor](https://www.comsol.com/model/computing-capacitance-12689) should be fairly similar to what you have in mind, and will help you get going. [This model](https://www.comsol.com/model/tunable-mems-capacitor-123) is also closely related and has a more interesting, 3D, geometry. To learn how to operate the software in a more structured manner, I strongly recommend the [Learning Center](https://www.comsol.com/learning-center). Many additional self-training resources are listed in my post [this recent thread](https://www.comsol.com/forum/thread/249171/comsol-multiphysics-intensive-online-training?last=2020-02-14T13:31:41Z). Best regards, Jeff
Akshay Sahota
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Posted: 5 years ago Feb 27, 2020, 2:36 p.m. EST

Thanks Jeff! I am trying to work on the lead you provided. Thank you once again for your time.

Thanks Jeff! I am trying to work on the lead you provided. Thank you once again for your time.
Akshay Sahota
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Posted: 5 years ago Feb 27, 2020, 6:16 p.m. EST

Hello,

I tried generating the electric field plot and I did it successfully but how to have equipotential lines contour for the same structure? Thanks

Hello, I tried generating the electric field plot and I did it successfully but how to have equipotential lines contour for the same structure? Thanks
Jeff Hiller COMSOL Employee

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Posted: 5 years ago Feb 28, 2020, 8:23 a.m. EST
Updated: 5 years ago Feb 28, 2020, 8:40 a.m. EST

The parallel plate capacitor model that I mentioned above (and which you can also find inside the software under the name capacitor_dc in the Applciaiton Libraries under the File menu) demonstrates how to do that with a contour plot. See also the attached screenshot from that model showing isopotential lines on a cut plane.

Best,

Jeff

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Jeff Hiller
The [parallel plate capacitor model](https://www.comsol.com/model/computing-capacitance-12689) that I mentioned above (and which you can also find inside the software under the name capacitor_dc in the Applciaiton Libraries under the File menu) demonstrates how to do that with a contour plot. See also the attached screenshot from that model showing isopotential lines on a cut plane. Best, Jeff

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Akshay Sahota
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Posted: 5 years ago Mar 4, 2020, 6:28 p.m. EST

Thanks for the help Jeff. This helps

Thanks for the help Jeff. This helps

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