  A comparative study of unloaded Q-factor measurements of a TE011 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 multi-frequency 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 non-calibrated cables) has been applied
also to the reflection data.
