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what is trelEx in comsol 4.1 RF module

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I am really confused right now... I am using comsol RF module, Electromagnetic waves, Frequency domain. I choose to solve for scattering field. When I plot the Electromagnetic waves, I find there are two expressions which both are called 'Relative electric field'. Take x component for example, one is relEx the other is trelEx. They have different values. Please can anyone tell me the physical difference between these two expressions?
Thanks.

0 Replies Last Post Apr 1, 2011, 4:18 p.m. EDT
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Hello Kui Bao

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