US4057772A
Expired / Lapsed
US
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Thermally compensated microwave resonator
Assignee: Raytheon Co
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Filing: 1976-10-18
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Granted: 1977-11-08
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Expires: 1996-10-18
Abstract
Abstract Thermal compensation for frequency control of microwave resonators through utilization of bimetallic boundary motion type phenomena is described, the resonator being rectangular and preferably having composite broad walls of integral layers, one of which having a relatively lower thermal expansion coefficient than another of the layers and each having an initial deformation in a stabilized curvature condition to render these walls frequency sensitive.
Inventors
- 👤 Richard V. Basil, Jr.
- 👤 Leons Ondrups
- 👤 James K. Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:57
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/06; H01P1/00; H01P1/30
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
120 words
A thermally compensated frequency controlled microwave resonator for operation over a predetermined operational temperature range, comprising: a rectangular resonator having conductive inner wall surfaces and oppositely disposed broad and narrow walls, at least one of said broad walls being a composite wall of integral wall layers one of which having a relatively lower thermal expansion coefficient than another of said layers, said composite wall deforming with changes in temperature and having a critical temperature whereat said composite wall snaps from one stabilized curvature condition to a different stabilized curvature condition, said critical temperature being outside said operational temperature range, said composite wall having an initial deformation in one of said stabilized curvature conditions to render said composite wall frequency sensitive.
Claim 2
Dependent Claim
120 words
A thermally compensated frequency controlled microwave resonator for operation over a predetermined operational temperature range, comprising: a rectangular resonator having conductive inner wall surfaces and oppositely disposed broad and narrow walls, at least one of said broad walls being a composite wall of integral wall layers one of which having a relatively lower thermal expansion coefficient than another of said layers, said composite wall deforming with changes in temperature and having a critical temperature whereat said composite wall snaps from one stabilized curvature condition to a different stabilized curvature condition, said critical temperature being outside said operational temperature range, said composite wall having an initial deformation in one of said stabilized curvature conditions to render said composite wall frequency sensitive.
Claim 3
Dependent Claim
20 words
The resonator according to claim 1, also comprising an adjustable tuning screw in at least one of said broad walls.
Claim 4
Dependent Claim
17 words
The resonator according to claim 1, wherein both broad walls of said resonator are said composite walls.
Claim 5
Dependent Claim
14 words
The resonator according to claim 1, wherein said composite wall is a bimetallic wall.
Claim 6
Dependent Claim
28 words
The resonator according to claim 1, wherein the outer one of said layers has a higher thermal expansion coefficient than that of the inner one of said layers.
Claim 7
Dependent Claim
17 words
The resonator according to claim 5, wherein said outer layer is relatively thicker than said inner layer.
Claim 8
Dependent Claim
15 words
The resonator according to claim 5, wherein said composite wall has an initial inward deformation.
Claim 9
Dependent Claim
18 words
The resonator according to claim 6, wherein said outer layer is silver and said inner layer is Invar.
Claim 10
Dependent Claim
28 words
The resonator according to claim 1, also comprising a relatively thin layer of a relatively high electrical conductivity material deposited on the inner surface of said resonator walls.
Claim 11
Dependent Claim
18 words
The resonator according to claim 9, wherein said thin layer of relatively high electrical conductivity material is silver.
Claim 12
Dependent Claim
18 words
The resonator according to claim 9, wherein said thin layer of relatively high electrical conductivity material is copper.
Claim 13
Dependent Claim
20 words
The resonator according to claim 9, wherein said thin layer of relatively high electrical conductivity material is copper and silver.
Claim 14
Dependent Claim
119 words
A thermally compensated frequency controlled microwave resonator for operation over a predetermined operational temperature range, comprising: a rectangular resonator having conductive inner wall surfaces and oppositely disposed broad and narrow walls, at least one of said walls being a composite wall of integral wall layers one of which having a relatively lower thermal expansion coefficient than another of said layers, said composite wall deforming with changes in temperature and having a critical temperature whereat said composite wall snaps from one stabilized curvature condition to a different stabilized curvature condition, said critical temperature being outside said operational temperature range, said composite wall having an initial deformation in one of said stabilized curvature conditions to render said composite wall frequency sensitive.
Claim 15
Dependent Claim
119 words
A thermally compensated frequency controlled microwave resonator for operation over a predetermined operational temperature range, comprising: a rectangular resonator having conductive inner wall surfaces and oppositely disposed broad and narrow walls, at least one of said walls being a composite wall of integral wall layers one of which having a relatively lower thermal expansion coefficient than another of said layers, said composite wall deforming with changes in temperature and having a critical temperature whereat said composite wall snaps from one stabilized curvature condition to a different stabilized curvature condition, said critical temperature being outside said operational temperature range, said composite wall having an initial deformation in one of said stabilized curvature conditions to render said composite wall frequency sensitive.
Claim 16
Dependent Claim
19 words
The resonator according to claim 13 also comprising an adjustable screw in at least one of said broad walls.
Claim 17
Dependent Claim
27 words
The resonator according to claim 13 also comprising a relatively thin layer of relatively high electrical conductivity material deposited on the inner surface of said resonator walls.
Claim 18
Dependent Claim
115 words
A thermally compensated frequency controlled microwave resonator for operation over a predetermined operational temperature range, comprising: a rectangular resonator having conductive inner wall surfaces and oppositely disposed broad and narrow walls, said narrow walls being composite walls of integral wall layers one of which having a relatively lower thermal expansion coefficient than another of said layers, said composite wall deforming with changes in temperature and having a critical temperature whereat said composite wall snaps from one stabilized curvature condition to a different stabilized curvature condition, said critical temperature being outside said operational temperature range, said composite wall having an initial deformation in one of said stabilized curvature conditions to render said composite wall frequency sensitive.
Claim 19
Dependent Claim
115 words
A thermally compensated frequency controlled microwave resonator for operation over a predetermined operational temperature range, comprising: a rectangular resonator having conductive inner wall surfaces and oppositely disposed broad and narrow walls, said narrow walls being composite walls of integral wall layers one of which having a relatively lower thermal expansion coefficient than another of said layers, said composite wall deforming with changes in temperature and having a critical temperature whereat said composite wall snaps from one stabilized curvature condition to a different stabilized curvature condition, said critical temperature being outside said operational temperature range, said composite wall having an initial deformation in one of said stabilized curvature conditions to render said composite wall frequency sensitive.
Claim 20
Dependent Claim
19 words
The resonator according to claim 16, also comprising at least one adjustable tuning screw in one of said walls.
Claim 21
Dependent Claim
27 words
The resonator according to claim 16, also comprising a relatively thin layer of a relatively high electrical conductivity material deposited on the inner surface of said resonator.
Claim 22
Dependent Claim
28 words
The resonator according to claim 16, wherein the inner one of said layers has a higher thermal expansion coefficient than that of the outer one of said layers.
Claim 23
Dependent Claim
17 words
The resonator according to claim 19, wherein said outer layer is relatively thicker than said inner layer.
Claim 24
Dependent Claim
18 words
The resonator according to claim 20, wherein said outer layer is silver and said inner layer is aluminum.
Claim 25
Dependent Claim
30 words
The resonator according to claim 21, also comprising a nickel base plate disposed on said aluminum, a copper-silver plating on said aluminum, and said silver layer on said copper-silver plating.
Claim 26
Dependent Claim
22 words
The resonator according to claim 22, further comprising a relatively thin silver plated layer on the inner surfaces of said narrow walls.
References Cited (Backward Citations)
US3063030A
Cited
US3034078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |