Title :
Temperature compensated cryogenic whispering gallery mode resonator for microwave frequency standard applications
Author :
Hao, Ling ; Klein, Norbert ; Gallop, John C. ; Radcliffe, W.J. ; Ghosh, Indra S.
Author_Institution :
Centre for Basic & Thermal Metrol., Nat. Phys. Lab., Teddington, UK
fDate :
4/1/1999 12:00:00 AM
Abstract :
We have investigated a miniature composite dielectric resonator employing a sapphire puck and a single crystalline platelet of rutile, excited in a whispering gallery mode. Modeling of the relative filling factors of the dielectric components is in good agreement with experiment. The loaded Q value at 17 GHz is as high as 3×106 . We have achieved values of the square-root of the Allan variance as low as 3×10-12 for an integration time of 1000 s with the prototype system. The high and resonator can also form the basis for a low-phase noise oscillator and we present data for the measured spectral density of phase noise
Keywords :
Q-factor; compensation; dielectric resonators; frequency standards; low-temperature techniques; microwave measurement; 17 GHz; Al2O3; Allan variance; Q-factor; TiO2; composite dielectric resonator; cryogenic whispering gallery mode resonator; filling factor; integration time; low phase noise oscillator; microwave frequency standard; sapphire puck; single crystalline rutile platelet; temperature compensation; Cryogenics; Crystallization; Density measurement; Dielectrics; Filling; Oscillators; Phase noise; Prototypes; Temperature; Whispering gallery modes;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
