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Rotation of an anisotropic material - RF waveguide

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I've constructed a partially filled wave guide with an anisotropic material, cube shaped, centered within the waveguide.

Is it possible to set up comsol so as when I rotate the cube within the geometry tab, the matrix defining the respective permitivies will change according to my object's orientation? Or do I need to manually go into "Wave Equation ~ Relative Permitivity ~ Change diagonal matrix values" to represent the rotation of the cube?

Thank you.



1 Reply Last Post 2014年6月9日 GMT-4 11:36
Robert Koslover Certified Consultant

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Posted: 1 decade ago 2014年6月9日 GMT-4 11:36
Two possibilities (at least):
1. You can set up a new alternative coordinate system for your cube. I expect that Comsol experts who read this will be happy to help you learn how to do that.
2. Whenever I have properties that I need to specify in terms of the "fixed" coordinates, but also need to re-orient, I normally just rotate *everything else* in the problem in the opposite direction. (This is basically a workaround, to avoid having to define and employ two coordinate systems in one problem.)
Two possibilities (at least): 1. You can set up a new alternative coordinate system for your cube. I expect that Comsol experts who read this will be happy to help you learn how to do that. 2. Whenever I have properties that I need to specify in terms of the "fixed" coordinates, but also need to re-orient, I normally just rotate *everything else* in the problem in the opposite direction. (This is basically a workaround, to avoid having to define and employ two coordinate systems in one problem.)

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