Wave transmission lines and networks – Resonators – Temperature compensated
Patent
1995-08-09
1999-06-01
Lee, Benny T.
Wave transmission lines and networks
Resonators
Temperature compensated
331 96, H01P 710
Patent
active
059091606
ABSTRACT:
A sapphire resonator for an ultrastable oscillator capable of substantial performance improvements over the best available crystal quartz oscillators in a compact cryogenic package is based on a compensation mechanism enabled by the difference between copper and sapphire thermal expansion coefficients for so tuning the resonator as to cancel the temperature variation of the sapphire's dielectric constant. The sapphire resonator consists of a sapphire ring separated into two parts with webs on the outer end of each to form two re-entrant parts which are separated by a copper post. The re-entrant parts are bonded to the post by indium solder for good thermal conductivity between parts of that subassembly which is supported on the base plate of a closed copper cylinder (rf shielding casing) by a thin stainless steel cylinder. A unit for temperature control is placed in the stainless steel cylinder and is connected to the subassembly of re-entrant parts and copper post by a layer of indium for good thermal conduction. In normal use, the rf shielding casing is placed in a vacuum tank which is in turn placed in a thermos flask of liquid nitrogen. The temperature regulator is controlled from outside the thermos flask to a temperature in a range of about 40.degree. to 150.degree. K, such as 87.degree. K for the WGH.sub.811 mode of resonance in response to microwave energy inserted into the rf shielding casing through a port from an outside source.
REFERENCES:
patent: 5059929 (1991-10-01), Tanaka
S.L. Abramov, Ye. N. Ivanov and D.P. Tsarapkin, "A Low-Noise Self-Excited Microwave Oscillator with a Thermally Compensated Disk Dielectric Resonator," Radiotechnika, No. 11, pp. 81-83, (1988), reprinted in English, Telecom and Radio Engineering, vol. 43, No. 12, pp. 127-129, (1990).
D.P. Tsarapkin, "An Uncooled Microwave Oscillator with 1-Million Effective Q-Factor," Proc. 1993 IEEE International Frequency Control Symposium, pp. 779-783, (1993).
Chen et al, "Tunable, Hybrid Mode Dielectric Resonators with Temperature Compensation"; Applied Microwaves; Aug./Sep. 1989; pp. 66-69.
Santiago D.G. and Dick, G.J.; "Closed Loop Tests of the NASA Sapphire Phase Stabilizer"; 1993 IEEE Int'l Frequency Control Symposium Proceedings; pp. 774-777.
Dick G. John
Santiago David G.
Kusmiss John H.
Lee Benny T.
The United State of America as the National Aeronautics and Spac
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