US4668925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric resonator and method for making
Assignee: TDK Corp
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Filing: 1985-11-15
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Granted: 1987-05-26
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Expires: 2005-11-15
Abstract
Abstract An improved dielectric resonator for high frequency operation having improved unloaded Q is provided which is prepared by forming a first copper coating on the ceramic body to a thickness of 0.2 to 1 μm by electroless plating or vacuum deposition, electrolytic plating a second copper coating on the first coating to a thickness of at least two-fold of the skin depth, and heat treating the thus coated body at 120°-300° C. in a reducing atmosphere or at 700°-1080° C. in a weakly acidic atmosphere.
Inventors
- 👤 Yoshishige Towatari
- 👤 Tetsuo Akoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:32
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A dielectric resonator suitable for high frequency operation comprising a dielectric ceramic body, a first copper coating of 0.2 to 1 μm thick on the ceramic body, and a second copper coating formed on the first coating by electrolytic plating to a thickness of at least two-fold of the skin depth at the frequency of operation, said first and second copper coatings having been heat treated after both coatings are applied to said ceramic body.
Claim 2
Dependent Claim
75 words
A dielectric resonator suitable for high frequency operation comprising a dielectric ceramic body, a first copper coating of 0.2 to 1 μm thick on the ceramic body, and a second copper coating formed on the first coating by electrolytic plating to a thickness of at least two-fold of the skin depth at the frequency of operation, said first and second copper coatings having been heat treated after both coatings are applied to said ceramic body.
Claim 3
Dependent Claim
20 words
A dielectric resonator according to claim 1 which further comprises a protective film of organic material on the second coating.
Claim 4
Dependent Claim
17 words
A dielectric resonator according to claim 1 which further comprises a conductive layer on the second coating.
Claim 5
Dependent Claim
15 words
A dielectric resonator according to claim 3 wherein the conductive layer is a solder layer.
Claim 6
Dependent Claim
32 words
A dielectric resonator according to claim 3 wherein the conductive layer comprises a first conductive layer of nickel applied to the second coating and a second conductive layer of tin applied thereto.
Claim 7
Independent Claim
66 words
A method for producing a dielectric resonator suitable for high frequency operation comprising the steps of forming a first copper coating on a ceramic body to a thickness of 0.2 to 1 μm, electrolytic plating a second copper coating on the first coating to a thickness of at least two-fold of the skin depth at the frequency of operation, and heat treating the thus coated body.
Claim 8
Independent Claim
66 words
A method for producing a dielectric resonator suitable for high frequency operation comprising the steps of forming a first copper coating on a ceramic body to a thickness of 0.2 to 1 μm, electrolytic plating a second copper coating on the first coating to a thickness of at least two-fold of the skin depth at the frequency of operation, and heat treating the thus coated body.
Claim 9
Dependent Claim
16 words
A method according to claim 6 wherein the first copper coating is formed by electroless plating.
Claim 10
Dependent Claim
17 words
A method according to claim 6 wherein the first copper coating is formed by vapor phase deposition.
Claim 11
Dependent Claim
22 words
A method according to claim 6 wherein the heat treatment is carried out at 120° to 300° C. in a reducing atmosphere.
Claim 12
Dependent Claim
23 words
A method according to claim 6 wherein the heat treatment is carried out at 700° to 1080° C. in a weakly oxidizing atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |