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US5378663A
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Method of preparing a dielectric ceramic composition for producing a dielectric resonator or filter for microwave applications
Assignee: NGK Insulators Ltd
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Filing: 1994-03-02
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Granted: 1995-01-03
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Expires: 2014-03-02
Abstract
Abstract A dielectric ceramic composition is disclosed which includes: a main ceramic composition of barium oxide and titanium oxide, or barium oxide, titanium oxide and at least one of strontium oxide, calcium oxide, zirconia and zinc oxide, which composition is represented by (1-a-b)BaOxaSrOxbCaOxx[(1-c)TiO2xcZrO2]xyZnO, where 3.1</=x </=5.4, 0</=y</=2.9, 0</=a+b</=0.4, 0</=c</=0.2; and a secondary component at least a part of which consists of a B2O3 material or a glass material containing B2O3 as one of glass components, the secondary component being added to the main ceramic composition, in an amount of 0.1-7.5 parts by weight of B2O3 per 100 parts by weight of the main ceramic composition. Also disclosed are a method of preparing such a dielectric ceramic composition, a dielectric resonator for microwave application which uses the dielectric ceramic composition, or a dielectric filter having a plurality of such dielectric resonators, and a method of producing the dielectric resonator or dielectric filter.
Inventors
- 👤 Masahiro Abe
- 👤 Tatsumi Sugiura
- 👤 Tsutomu Nanataki
- 👤 Shinsuke Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:34
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/46; C04B35/462; C04B35/465; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
175 words
A method of preparing a dielectric ceramic composition used for producing a dielectric resonator or filter for microwave application, comprising the steps of: calcining, at a temperature of not lower than 900° C., a mixture of starting materials which give a main ceramic composition comprising as major components barium oxide and titanium oxide, or barium oxide, titanium oxide and at least one of strontium oxide, calcium oxide, zirconia and zinc oxide, which composition is represented by (1-a-b)BaO·aSrO·bCaO·x[(1-c)TiO 2 ·cZrO 2 ]·yZnO, where 3.1≦x≦5.4, 0≦y≦2.9, 0≦a+b≦0.4, 0≦c≦0.2, to provide a calcined mixture; finely pulverizing said calcinated mixture to provide a calcined ceramic powder; and adding a secondary component to said calcined ceramic powder, at least a part of said secondary component consisting of a B 2 O 3 material or a glass material containing B 2 O 3 as one of glass components, said secondary component being added to said main ceramic composition in an amount of 0.1-7.5 parts by weight of B 2 O 3 per 100 parts by weight of said main ceramic composition.
Claim 2
Independent Claim
175 words
A method of preparing a dielectric ceramic composition used for producing a dielectric resonator or filter for microwave application, comprising the steps of: calcining, at a temperature of not lower than 900° C., a mixture of starting materials which give a main ceramic composition comprising as major components barium oxide and titanium oxide, or barium oxide, titanium oxide and at least one of strontium oxide, calcium oxide, zirconia and zinc oxide, which composition is represented by (1-a-b)BaO·aSrO·bCaO·x[(1-c)TiO 2 ·cZrO 2 ]·yZnO, where 3.1≦x≦5.4, 0≦y≦2.9, 0≦a+b≦0.4, 0≦c≦0.2, to provide a calcined mixture; finely pulverizing said calcinated mixture to provide a calcined ceramic powder; and adding a secondary component to said calcined ceramic powder, at least a part of said secondary component consisting of a B 2 O 3 material or a glass material containing B 2 O 3 as one of glass components, said secondary component being added to said main ceramic composition in an amount of 0.1-7.5 parts by weight of B 2 O 3 per 100 parts by weight of said main ceramic composition.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein said mixture of starting materials is calcined at a temperature of 1000°-1300° C.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein said calcined mixture is finely pulverized so that said calcined ceramic powder has an average grain size of not larger than 0.8 μm.
Claim 5
Dependent Claim
30 words
A method according to claim 3, wherein said calcined mixture is finely pulverized so that said calcined ceramic powder has an average grain size of not larger than 0.7 μm.
References Cited (Backward Citations)
FR978110A
Cited
DE1474421A1
Cited
US3983064A
Cited
US4222783A
Cited
JPS5522012A
Cited
JPS5769607A
Cited
US4335216A
Cited
JPS5820905A
Cited
JPS5873908A
Cited
US4692725A
Cited
US4603311A
Cited
US4610968A
Cited
US4610971A
Cited
JPS60257008A
Cited
JPS61242953A
Cited
US4609892A
Cited
US4816788A
Cited
FR2601357A1
Cited
EP0385338A2
Cited
US4999737A
Cited
EP0412440A2
Cited
US5097237A
Cited
US5290740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |