US5290740A
Expired / Lapsed
US
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Dielectric ceramic composition used for producing dielectric resonator or filter for microwave application
Assignee: NGK Insulators Ltd
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Filing: 1992-11-03
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Granted: 1994-03-01
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Expires: 2012-11-03
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)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; and a secondary component at least a part of which consists of a B 2 O 3 material or a glass material containing 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 B 2 O 3 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 15:43
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: 10
Claim 1
Independent Claim
131 words
A dielectric ceramic composition used for producing a dielectric resonator or filter for microwave application, which consists essentially of: 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 .cArO 2 ].yZnO, 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 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
Dependent Claim
131 words
A dielectric ceramic composition used for producing a dielectric resonator or filter for microwave application, which consists essentially of: 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 .cArO 2 ].yZnO, 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 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
26 words
A dielectric ceramic composition according to claim 1, wherein a portion of BaO is substituted by at least one of SrO and CaO such that 0.05≦a+b≦0.2.
Claim 4
Dependent Claim
10 words
A dielectric ceramic composition according to claim 1, wherein 3.5≦x≦5.0.
Claim 5
Dependent Claim
10 words
A dielectric ceramic composition according to claim 2, wherein 3.8≦x≦4.2.
Claim 6
Dependent Claim
74 words
A dielectric ceramic composition according to claim 1, wherein said main ceramic composition further comprises a metal oxide which is selected from the group consisting of alumina, tungsten oxide, nickel oxide, iron oxide, manganese oxide, and chromium oxide, and said metal oxide is present in an amount sufficient to improve an unloaded Q of said dielectric resonator or filter, and control a temperature coefficient of a resonance frequency of said dielectric resonator or filter.
Claim 7
Dependent Claim
42 words
A dielectric ceramic composition according to claim 1, wherein said secondary component is added to said main ceramic composition, in an amount of 0.1-6.0 parts by weight of B 2 O 3 per 100 parts by weight of said main ceramic composition.
Claim 8
Dependent Claim
19 words
A dielectric ceramic composition according to claim 1, wherein said secondary component consists of B 2 O 3 powder.
Claim 9
Dependent Claim
43 words
A dielectric ceramic composition according to claim 1, wherein said secondary component consists of a B 2 O 3 powder as said B 2 O 3 material, and at least one of powders of ZnO, SiO 2 and Bi 2 O 3 .
Claim 10
Dependent Claim
55 words
A dielectric ceramic composition according to claim 1, wherein said secondary component consists of a glass powder selected from the group consisting of a ZnO--SiO 2 --B 2 O 3 glass, SiO 2 --B 2 O 3 glass, Bi 2 O 3 --ZnO--B 2 O 3 glass, and PbO--SiO 2 --B 2 O 3 glass.
References Cited (Backward Citations)
FR978110A
Cited
DE1474421A1
Cited
US3938064A
Cited
US4222783A
Cited
JPS5522012A
Cited
JPS5769607A
Cited
US4335216A
Cited
JPS5820905A
Cited
JPS5873908A
Cited
US4610971A
Cited
US4610968A
Cited
JPS60257008A
Cited
JPS61242953A
Cited
FR2601357A1
Cited
EP0385339A2
Cited
US4999737A
Cited
EP0412440A2
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
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