Calculating the Quality Factor
Q is the unloaded quality factor, and is a measure of how much energy is lost in the structure due to lossy materials. Because ports and other sources are restricted for Eigenmode solutions, the Q calculated does not include losses due to those sources.
HFSS uses the following equation to calculate the approximate quality factor:
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(1) |
The Fields Calculator can also be used to calculate Q. In general, the equation for Q is
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(2) |
where:
- U is the total energy stored in the cavity.
- P is the power lost, from resistive losses, for example.