This title appears in the Scientific Report :
2001
Please use the identifier:
http://hdl.handle.net/2128/2103 in citations.
Please use the identifier: http://dx.doi.org/10.1109/77.919563 in citations.
Cryogenic high-Q microwave resonators for stable oscillators
Cryogenic high-Q microwave resonators for stable oscillators
Cryogenic microwave resonators have a strong potential as frequency stabilising elements for oscillators to be used in advanced radar systems and high-bitrate microwave communication links. Depending on frequency, either 2D planar MTS-resonators, MTS-shielded sapphire TE011 resonators or cryogenic s...
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Personal Name(s): | Vitusevich, S. |
---|---|
Winter, M. / Klein, N. | |
Contributing Institute: |
Institut für Bio- und Chemosensoren; ISG-2 |
Published in: | IEEE transactions on applied superconductivity, 11 (2001) S. 1195 |
Imprint: |
New York, NY
IEEE
2001
|
Physical Description: |
1195 |
DOI: |
10.1109/77.919563 |
Document Type: |
Journal Article |
Research Program: |
Schichtsysteme und Bauelemente der Supraleiterelektronik |
Series Title: |
IEEE Transactions on Applied Superconductivity
11 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1109/77.919563 in citations.
Cryogenic microwave resonators have a strong potential as frequency stabilising elements for oscillators to be used in advanced radar systems and high-bitrate microwave communication links. Depending on frequency, either 2D planar MTS-resonators, MTS-shielded sapphire TE011 resonators or cryogenic sapphire whispering-gallery mode resonators represent the best compromise between resonator quality factor and size, We have built and tested an all-cryogenic oscillator based on a WG-resonator at f = 23 GHz, Phase noise measurements indicate values superior to quartz stabilized oscillators. A two-step electric frequency tuning consisting of an integrated varactor phase shifter and a dielectric plunger moved by a piezomechanical transducer is introduced to compensate frequency drifting with temperature. For further improvement of long-time frequency stability we have developed rutile-sapphire composite dielectric resonators. Due to the opposite sign of the temperature slope of the dielectric constant of sapphire and rutile a turning point appears in the temperature dependence of the resonance frequency. Employing a moderate temperature stabilization as good as a few millikelvin around the turning point at T = 78 K, we have demonstrated a long time frequency stability at least as good as for oven controlled quartz oscillators. |