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US4960739A
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Method for producing a material for use in a microwave dielectric resonator
Assignee: Proterial Ltd
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Filing: 1990-02-08
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Granted: 1990-10-02
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Expires: 2010-02-08
Abstract
Abstract A dielectric material for use in a microwave resonator comprises 78.1 mol % of TiO 2 , 15.7 to 17.8 mol % of BaO, 4.00 ml % of SnO 2 and at least one of 0.1 to 1.0 mol % of SrO and 0.1 to 1.2 mol % of CaO.
Inventors
- 👤 Keisuke Kageyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A method of producing a dielectric material for use in a microwave dielectric resonator which includes the steps of (1) providing a mixture of initial ingredients from which a dielectric material containing 78.1 mol % TiO 2 , 15.7 to 17.8 mol % BaO and 4.00 mol% SnO 2 can be produced, (2) providing a mixture of final ingredients by adding at least one compound selected from the group consisting of SrCO 3 and CaCO 3 to the mixture of initial ingredients so that the produced dielectric material will include at least one of 0.1 to 1.0 mol% SrO and 0.1 to 1.2 mol % CaO, the dielectric material thereby having a permittivity of about 38 and a temperature coefficient of resonance frequency of between -25 ppm/° C. and +10 ppm/° C., (3) drying and calcining the mixture of final ingredients, (4) crushing, drying, pelletizing compacting and firing the dried and calcined mixture of final ingredients to form the dielectric material.
Claim 2
Independent Claim
161 words
A method of producing a dielectric material for use in a microwave dielectric resonator which includes the steps of (1) providing a mixture of initial ingredients from which a dielectric material containing 78.1 mol % TiO 2 , 15.7 to 17.8 mol % BaO and 4.00 mol% SnO 2 can be produced, (2) providing a mixture of final ingredients by adding at least one compound selected from the group consisting of SrCO 3 and CaCO 3 to the mixture of initial ingredients so that the produced dielectric material will include at least one of 0.1 to 1.0 mol% SrO and 0.1 to 1.2 mol % CaO, the dielectric material thereby having a permittivity of about 38 and a temperature coefficient of resonance frequency of between -25 ppm/° C. and +10 ppm/° C., (3) drying and calcining the mixture of final ingredients, (4) crushing, drying, pelletizing compacting and firing the dried and calcined mixture of final ingredients to form the dielectric material.
Claim 3
Dependent Claim
50 words
A method according to claim 1, wherein an amount of CaCO 3 is added to the mixture of initial ingredients so that the produced dielectric material includes 0.3 to 1.2 mol% of CaO and the dielectric material has a temperature coefficient of permittivity Tf of -20 to +10 ppm/° C.
Claim 4
Dependent Claim
48 words
A method according to claim 1, wherein an amount of SrCO 3 is added to the mixture of initial ingredients so that the produced dielectric material includes 0.5 to 1.0 mol% of SrO, said dielectric material having a temperature coefficient of permittivity Tf of -15 to 0 ppm/°°C.
Claim 5
Dependent Claim
57 words
A method according to claim 1, wherein amounts of SrCO 3 and CaCO 3 are added to the mixture of initial ingredients so that produced dielectric material includes 0.1 to 0.6 mol% of SrO and 0.1 to 0.6 mol% of CaO, said dielectric material having a temperature coefficient of permittivity Tf of -25 to 0 ppm/° C.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein the dielectric material has a dielectric loss Q of 5000 to 6000.
Claim 7
Dependent Claim
19 words
A method according to claim 5, wherein the dielectric material has a dielectric loss Q of 5300 to 5800.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |