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

Volume

48

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

524

Lastpage

527

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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.769649

Filename

769649