Abstract
A practical method of measuring microwave resonator unloaded Q-factor is presented, which could eliminate phase shift of feed line when Q-factor is estimated by critical-points method. The presence of the phase shift would rotate the resonator's input-impedance locus in Smith Chart, thereby affecting measurement result. To de-embed the phase shift, an objective function was introduced to find the proper rotation angle caused by feed line instead of calibration using extra measurement. The method was demonstrated by simulation data and measurement data.
| Original language | English |
|---|---|
| Pages (from-to) | 646-648 |
| Number of pages | 3 |
| Journal | Tien Tzu Hsueh Pao/Acta Electronica Sinica |
| Volume | 37 |
| Issue number | 3 |
| State | Published - Mar 2009 |
Keywords
- Critical-points method
- Microwave resonator
- Phase shift
- Unloaded Q-factor