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US5238887A
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Ceramic composition for microwave dielectric
Assignee: Niterra Co Ltd
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Filing: 1992-07-02
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Granted: 1993-08-24
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Expires: 2012-07-02
Abstract
Abstract Disclosed herein is a ceramic composition which gives a microwave dielectric having a permittivity and unloaded Q in a practical range and a small temperature coefficient (τf) in the neighborhood of zero of resonance frequency owing to the controlled amount of ZnO and Ta 2 O 5 added. The τf value may be positive or negative in the neighborhood of zero according to need. The ceramic composition comprises a principal component represented by (BaO-3.7TiO 2 ).xZnO, where x is in the range of 15≦x≦17 wt % and a secondary component containing 2-6 wt % Ta 2 O 5 and not more than 1 wt % MnO 2 based on the amount of the principal component. The ceramic composition may also contain BaO-3.8TiO 2 , 12-16 wt % ZnO, and 2-6 wt % Ta 2 O 5 , or contain BaO-3.6TiO 2 , 17-19 wt % ZnO, and 2-6 wt % Ta 2 O 5 .
Inventors
- 👤 Tokiomi Kato
- 👤 Hirofumi Ozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; H05; H05B; H05B6/00; H05B6/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.8TiO 2 ).xZnO, where x is in the range of 12≦x≦16 wt % based on the amount of BaO-3.8TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component.
Claim 2
Dependent Claim
69 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.8TiO 2 ).xZnO, where x is in the range of 12≦x≦16 wt % based on the amount of BaO-3.8TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component.
Claim 3
Dependent Claim
69 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.7TiO 2 ).xZnO, where x is in the range of 15≦x≦17 wt % based on the amount of BaO-3.7TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component.
Claim 4
Dependent Claim
69 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.7TiO 2 ).xZnO, where x is in the range of 15≦x≦17 wt % based on the amount of BaO-3.7TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component.
Claim 5
Dependent Claim
69 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.6TiO 2 ).xZnO, where x is in the range of 17≦x≦19 wt % based on the amount of BaO-3.6TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component.
Claim 6
Dependent Claim
69 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.6TiO 2 ).xZnO, where x is in the range of 17≦x≦19 wt % based on the amount of BaO-3.6TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component.
Claim 7
Dependent Claim
87 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.7˜3.8TiO 2 ).xZnO, where x is in the range of 12≦x≦17 wt % based on the amount of BaO-3.7˜3.8TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component, and a temperature coefficient of resonance frequency τf values is in the range of -5 to +5 ppm/°C.
Claim 8
Dependent Claim
87 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.7˜3.8TiO 2 ).xZnO, where x is in the range of 12≦x≦17 wt % based on the amount of BaO-3.7˜3.8TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component, and a temperature coefficient of resonance frequency τf values is in the range of -5 to +5 ppm/°C.
Claim 9
Dependent Claim
87 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.6˜3.7TiO 2 ).xZnO, where x is in the range of 15≦x≦19 wt % based on the amount of BaO-3.6˜3.7TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component, and a temperature coefficient of resonance frequency τf values is in the range of -5 to +5 ppm/°C.
Claim 10
Dependent Claim
87 words
A ceramic composition for microwave dielectric which comprises a principal component composed of BaO, TiO 2 , and ZnO, and a secondary component, said principal component being represented by (BaO-3.6˜3.7TiO 2 ).xZnO, where x is in the range of 15≦x≦19 wt % based on the amount of BaO-3.6˜3.7TiO 2 , said secondary component containing 2-6 wt % Ta 2 O 5 based on the amount of the principal component, and a temperature coefficient of resonance frequency τf values is in the range of -5 to +5 ppm/°C.
Claim 11
Dependent Claim
36 words
A ceramic composition for microwave dielectric as defined in any of claims 1 to 5, which further comprises MnO 2 in an amount not more than 1 wt % of the amount of the ceramic composition.
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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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |