Patent US3902138A successfully refreshed from Google Patents.
US3902138A
Expired / Lapsed
US
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Temperature stabilized coaxial cavity microwave oscillator
Assignee: General Electric Co
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Filing: 1974-07-22
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Granted: 1975-08-26
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Expires: 1994-07-22
Abstract
Abstract A microwave, one-half wave, coaxial cavity oscillator comprising a tubular cavity body having a section thereof constructed of a material having a high coefficient of expansion, a tube, an anode line having a section thereof constructed of a material having a low coefficient of expansion, and tuning member connected to an end plate of said body remote from said tube, which member forms an automatically variable capacitor with an end face of the anode line thereby to provide a variable capacitance responsive to operating temperature variations to minimize frequency deviations when the oscillator is operated under widely varying ambient temperatures. Another feature of the oscillator comprises a partition of high thermal conductivity connected between the anode line and cavity body to rapidly dissipate the heat generated by the tube, thereby to minimize the temperature gradient within the cavity body.
Inventors
- 👤 Jr Claude Hopper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:40
CPC Classifications
H; H03; H03L; H03L1/00; H03L1/02; H03L1/021; H03B; H03B5/00; H03B5/18; H03B5/1817; H03B5/1835
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
A microwave one-half wave cavity oscillator comprising: a. a tubular cavity body; b. a controlled charge carrier device mounted at a first end of said body, said device comprising a first electrode terminal; c. a conductive line connected to said terminal, said line extending coaxially of the longitudinal axis of said body and forming a coaxial one-half wave resonant cavity with said body, said line having a surface adjacent the second end of said body and transverse to said axis; d. an electrically conductive member connected to said body and having a face disposed opposite to and spaced from said surface thereby to form a capacitive relationship between said face and said surface; e. said body and said line comprising means varying the spacing between said face and said surface responsive to operating temperature variations, thereby to minimize frequency deviations caused by operating temperature variations.
Claim 2
Dependent Claim
145 words
A microwave one-half wave cavity oscillator comprising: a. a tubular cavity body; b. a controlled charge carrier device mounted at a first end of said body, said device comprising a first electrode terminal; c. a conductive line connected to said terminal, said line extending coaxially of the longitudinal axis of said body and forming a coaxial one-half wave resonant cavity with said body, said line having a surface adjacent the second end of said body and transverse to said axis; d. an electrically conductive member connected to said body and having a face disposed opposite to and spaced from said surface thereby to form a capacitive relationship between said face and said surface; e. said body and said line comprising means varying the spacing between said face and said surface responsive to operating temperature variations, thereby to minimize frequency deviations caused by operating temperature variations.
Claim 3
Dependent Claim
56 words
The oscillator of claim 1 wherein said means is a body section of said body constructed of a material having a high coefficient of expansion, and a line section of said line constructed of a material having a low coefficient of expansion, and whereby the spacing variation is approximately directly proportional to the ambient temperature variation.
Claim 4
Dependent Claim
106 words
The oscillator of claim 1 wherein said body comprises a first body section of a material having a low coefficient of expansion; said line comprises a first line section of a high thermal conductivity and a high coefficient of expansion, said first line section disposed within said first body section; said connection between said line and said terminal comprises a first end of said first line section slidably mounted on said terminal; and said oscillator comprises a partition connected to said first line section and to said body, for holding the electrical length of said first line section substantially constant during variations in the ambient temperature.
Claim 5
Dependent Claim
85 words
The oscillator of claim 3 wherein said means is a second body section connected to said first body section and constructed of a material having a high coefficient of expansion and a second line section connected at a first end to a second end of said first line section and constructed of a material having a low coefficient of expansion, said surface being formed on one end of said second line section whereby the spacing variation is approximately directly proportional to the ambient temperature variation.
Claim 6
Dependent Claim
23 words
The oscillator of claim 4 wherein said partition has a high thermal conductivity and is disposed between said first and second body sections.
Claim 7
Dependent Claim
40 words
The oscillator of claim 5 wherein said partition comprises an electrically insulating washer thermally connected to said first line section and constructed of a thermally conductive material, and a central body section thermally connected between said body and said washer.
Claim 8
Dependent Claim
30 words
The oscillator of claim 1 further comprising an end plate closing the second end of said body and wherein said member is a tuning screw mounted in said end plate.
Claim 9
Dependent Claim
46 words
The oscillator of claim 1 further comprising an oscillator tuning element having an end surface disposed in a substantially parallel relationship to said axis, said element forming a capacitive relationship with said line and being constructed of a material having a low coefficient of thermal expansion.
Claim 10
Dependent Claim
24 words
The oscillator of claim 1 wherein said device is a triode vacuum tube and said terminal is connected to the anode of said tube.
References Cited (Backward Citations)
US2436700A
Cited
US3631363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |