Ansys Insight: Negative Q-factor
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In some situations, you might see a negative Q-factor, and this is obviously wrong. This post discuss one possible reason that can cause a false Q value from a simulation.
High Q cavities
If this is a high Q cavity, light can be trapped within the cavity for a long time. As a results, it is not very efficient to wait for the simulation to finish and take the ratio of the resonant frequency and delta_f. Instead, we use another approach to look at a portion of the decaying signal to find Q.
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