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HFSS15: Calculating the Quality Factor
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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:
| 
| (1) |
The Fields Calculator can also be used to calculate Q. In general, the equation for Q is
| 
| (2) |
where:
• U 
is the total energy stored in the cavity.
• P 
is the power lost, from resistive losses, for example.
