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A comparative study of unloaded Q-factor measurements of a TE/sub 011/ mode sapphire dielectric resonator with unloaded Q-factor value of 731,000 at a frequency of 10 GHz and temperature of 65 K using two best Q-factor measurement methods are presented. The transmission (TMQF) and reflection methods are based on relevant multifrequency S-parameter measurements and circle-fitting procedures to compute the unloaded Q-factor of the resonator. For accurate comparison of the methods, a delay compensation procedure (introduced in the TMQF technique to remove delay due to noncalibrated cables) has been applied also to the reflection data.
Microwave Symposium Digest, 2002 IEEE MTT-S International (Volume:3 )
Date of Conference: 2-7 June 2002