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Oscillating Charged Sphere

Posted 12 mars 2012, 09:29 UTC−4 RF & Microwave Engineering Version 4.1 1 Reply

Dennis Earl
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I'm trying to simulate the E&M fields produced by an oscillating sphere with a fixed surface charge. The sphere's radius is oscillating so that the charge is moving radially. As this charge moves, I'd like to simulate the electric and magnetic fields it produces. To do this, I'm using COMSOL's RF package Electromagnetics module. Although surface current can be defined, I'm not sure how to configure these surface currents to represent a radially oscillating fixed charge. This is easy to do using COMSOL's Electrostatics module but I want to see the E&M fields produced. Any thoughts?

Thanks.
1 Reply Last Post 12 mars 2012, 09:43 UTC−4
Edgar Kaiser
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Posted: 1 decade ago 12 mars 2012, 09:43 UTC−4
Hi,

surface current on a sphere won't do the job, it has no radial component. You might try to define a radial current density in spherical shell that results from an outer and a concentric inner sphere representing the oscillation amplitude.

Cheers
Edgar
Hi, surface current on a sphere won't do the job, it has no radial component. You might try to define a radial current density in spherical shell that results from an outer and a concentric inner sphere representing the oscillation amplitude. Cheers Edgar

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