Frequency stable oscillators based on cryogenic whispering gallery mode resonators

Author

Vitusevich, S. ; Winter, M. ; Klein, N.

Author_Institution

Inst. of Thin Films & Interfaces, Forschungszentrum Julich GmbH, Germany

Volume

1

fYear

2001

fDate

2001

Firstpage

90

Abstract

An all-cryogenic oscillator consisting of a frequency tunable sapphire resonator, a high temperature superconducting filter and a PHEMT amplifier was designed for the K-band frequency range and investigated. Sapphire whispering-gallery mode resonators possess high quality factors of about several millions due to the advantage of the strong electromagnetic field confinement. As a result the phase noise measured for the oscillator exhibits very low values in comparison to conventional oscillators. In addition, the effect of small rutile-platelets on the long-term temperature stability is measured and discussed. We have found that our composite resonators with rutile filling factor slightly below 1% exhibits a turning point in the temperature dependence of the resonance frequency at about 65-78 K. This results in a long time frequency stability as good as for oven controlled quartz oscillators by maintaining a high resonator quality factor in the 10⁷ range at 10 GHz

Keywords

Q-factor; circuit stability; cryogenic electronics; dielectric resonator oscillators; frequency stability; microwave oscillators; phase noise; sapphire; thermal stability; titanium compounds; variable-frequency oscillators; 10 GHz; 65 to 78 K; Al₂O₃; Al₂O₃-TiO₂; K-band frequency range; PHEMT amplifier; TiO₂; all-cryogenic oscillator; composite resonators; electromagnetic field confinement; frequency tunable sapphire resonator; high quality factors; high temperature superconducting filter; long time frequency stability; long-term temperature stability; phase noise; rutile filling factor; rutile-platelets; sapphire whispering-gallery mode resonators; Cryogenics; Electromagnetic measurements; Oscillators; PHEMTs; Q factor; Resonant frequency; Stability; Superconducting filters; Temperature distribution; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Physics and Engineering of Millimeter and Sub-Millimeter Waves, 2001. The Fourth International Kharkov Symposium on

Conference_Location

Kharkov

Print_ISBN

0-7803-6473-2

Type

conf

DOI

10.1109/MSMW.2001.946752

Filename

946752