EP0541397A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dielectric ceramic composition, method of preparing the composition, and dielectric resonator or filter using the composition
Assignee: NGK Insulators Ltd
•
Filing: 1992-11-06
•
Granted: —
•
Expires: 2012-11-06
Abstract
Abstract A dielectric ceramic composition is disclosed which consists essentially of: 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)TiO₂·cZrO₂]·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 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 Ngk Insulators Ltd Abe
- 👤 Tatsumi Ngk Insulators Ltd Sugiura
- 👤 Tsutomu Ngk Insulators Ltd. Nanataki
- 👤 Shinsuke Narumi-Danchi 89-301 Yano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 17:31
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: 16
Claim 1
Independent Claim
133 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)TiO₂·cZrO₂]·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 B₂O₃ material or a glass material containing B₂O₃ 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 B₂O₃ per 100 parts by weight of said main ceramic composition.
Claim 2
Dependent Claim
30 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 3
Dependent Claim
39 words
A dielectric ceramic composition according to claim 1 or 2, wherein TiO₂ or [(1-c)TiO₂·cZrO₂] is contained in said main ceramic composition in an amount of 3.5-5.0 mol with respect to 1 mol of (1-a-b)BaO·aSrO·bCaO (3.5 ≦ x ≦ 5.0.).
Claim 4
Dependent Claim
37 words
A dielectric ceramic composition according to claim 2, wherein TiO₂ or [(1-c)TiO₂·cZrO₂] is contained in said main ceramic composition in an amount of 3.8-4.2 mol with respect to 1 mol of (1-a-b)BaO·aSrO·bCaO (3.8 ≦ x ≦ 4.2.).
Claim 5
Dependent Claim
41 words
A dielectric ceramic composition according to any one of claims 1-4, 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.
Claim 6
Dependent Claim
42 words
A dielectric ceramic composition according to any one of claims 1-5, wherein said secondary component is added to said main ceramic composition, in an amount of 0.1-6.0 parts by weight of B₂O₃ per 100 parts by weight of said main ceramic composition.
Claim 7
Dependent Claim
27 words
A dielectric ceramic composition according to any one of claims 1-6, wherein said secondary component consists of said B₂O₃ material in the form of a B₂O₃ powder.
Claim 8
Dependent Claim
35 words
A dielectric ceramic composition according to any one of claims 1-6, wherein said secondary component consists of a B₂O₃ powder as said B₂O₃ material, and at least one of powders of ZnO, SiO₂ and Bi₂O₃.
Claim 9
Dependent Claim
47 words
A dielectroc ceramic composition according to any one of claims 1-6, wherein said secondary component consists of said glass material in the form of a glass powder, said glass material being selected from the group consisting of a ZnO-SiO₂-B₂O₃ glass, SiO₂-B₂O₃ glass, Bi₂O₃-ZnO-B₂O₃ glass, and PbO-SiO₂-B₂O₃ glass.
Claim 10
Dependent Claim
55 words
A method of preparing the dielectric ceramic composition as defined in claim 1, comprising the steps of: calcining a mixture of starting materials which give said main ceramic composition, to provide a calcined mixture; finely pulverizing said calcined mixture to provide a calcined ceramic powder; and adding said secondary component to said calcined ceramic powder.
Claim 11
Dependent Claim
28 words
A method according to claim 10, wherein said mixture of starting materials which give said main ceramic composition is calcined at a temperature of not lower than 900°C.
Claim 12
Dependent Claim
19 words
A method according to claim 11, wherein said mixture of starting materials is calcined at a temperature of 1000-1300°C.
Claim 13
Independent Claim
33 words
A method according to any one of claims 10-12, 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 14
Dependent Claim
30 words
A method according to claim 13, 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.
Claim 15
Dependent Claim
89 words
A dielectric resonator for microwave application or a dielectric filter comprising a plurality of dielectric resonators, comprising: a dielectric ceramic obtained by firing the dielectric ceramic composition as defined in claim 1; and a conductor pattern which is formed by co-firing with said dielectric ceramic so that said conductor pattern is incorporated in said dielectric ceramic, said conductor pattern being formed of a material selected from the group consisting of Ag, Cu, an alloy containing Ag as a major component, and an alloy containing Cu as a major component.
Claim 16
Dependent Claim
137 words
A method of producing a dielectric resonator for microwave application or a dielectric filter comprising a plurality of dielectric resonators, said dielectric resonator comprising a dielectric ceramic, and a conductor pattern incorporated in the dielectric ceramic, comprising the steps of: preparing a green sheet or calcined body made of the dielectric ceramic composition as defined in claim 1, which gives said dielectric ceramic; forming at least one conductive layer which gives said conductor pattern, on said green sheet or calcined body, said at least one conductive layer being formed of a material selected from the group consisting of Ag, Cu, an alloy containing Ag as a major component, and an alloy containing Cu as a major component; and co-firing said green sheet or calcined body of the dielectric ceramic composition with said at least one conductive layer.
References Cited (Backward Citations)
FR978110A
Cited
DE1474421A1
Cited
FR2242812A1
Cited
FR2601357A1
Cited
EP0385339A2
Cited
EP0412440A2
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.