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Capacitance with an electric shield
Posted 25.01.2011, 17:20 GMT-5 Low-Frequency Electromagnetics Version 5.1 3 Replies
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Hello everyone!
I'd like to determine the capacitance between two wires a metal plate inserted between them to act as an electric shield. In the COMSOL 3.3 AC/DC Module 3D Electrostatics Application Mode I set one of the wires to the "port" boundary condition, set the other to "ground," and set the plate to the "electric shielding" boundary condition. The wires and plate are surrounded by a large box with the "zero charge / symmetry" boundary condition applied at its six surfaces. My geometry and an image of my simulation results are attached.
My problem is that the electrostatic potential varies across the surface of the plate. For a conducting metal plate, the potential should be constant everywhere on its surface. Evidently COMSOL is treating the plate as non-conducting.
What boundary conditions must I apply to the plate to ensure it acts as a conducting electric shield? Do I need to use a different application mode?
Thank you!
M. Dyck
P.S. I recognize this problem could likely be simplified to 2D but I will be adding additional geometry objects in the future which necessitate a 3D model.
I'd like to determine the capacitance between two wires a metal plate inserted between them to act as an electric shield. In the COMSOL 3.3 AC/DC Module 3D Electrostatics Application Mode I set one of the wires to the "port" boundary condition, set the other to "ground," and set the plate to the "electric shielding" boundary condition. The wires and plate are surrounded by a large box with the "zero charge / symmetry" boundary condition applied at its six surfaces. My geometry and an image of my simulation results are attached.
My problem is that the electrostatic potential varies across the surface of the plate. For a conducting metal plate, the potential should be constant everywhere on its surface. Evidently COMSOL is treating the plate as non-conducting.
What boundary conditions must I apply to the plate to ensure it acts as a conducting electric shield? Do I need to use a different application mode?
Thank you!
M. Dyck
P.S. I recognize this problem could likely be simplified to 2D but I will be adding additional geometry objects in the future which necessitate a 3D model.
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3 Replies Last Post 31.01.2011, 08:22 GMT-5