US4548910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric ceramic of BaO-TiO2 and SnO2
Assignee: TDK Corp
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Filing: 1984-12-10
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Granted: 1985-10-22
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Expires: 2004-12-10
Abstract
Abstract The components, of a microwave circuit, such as a filter, and a solid oscillator, etc. consists of a dielectric ceramic composition. A known BaO-TiO 2 compound exhibits properties which make it suitable for use as the components of a microwave circuit but the resonance frequency linearity and the resonance frequency temperature coefficient are not excellent. The dielectric ceramic composition of the present invention is expressed by the formula of BaO.x{(1-y)TiO 2 .ySnO 2 }, wherein x is 4.4 moles and y is from 0.06 to 0.09 mole, and has a mixed crystal structure of Ba(Ti.Sn) 4 O 9 and Ba 2 (Ti.Sn) 9 O 20 .
Inventors
- 👤 Naoshi Irisawa
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; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; H; H01; H01P; H01P1/00; H01P1/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A dielectric ceramic composition consisting of three components, namely, BaO, TiO 2 , and SnO 2 , being expressed by the formula BaO.x{(1-y)TiO 2 .ySnO 2 }, wherein x is 4.4 mole, and y is from 0.06 to 0.09, and having a mixed crystal structure of Ba(Ti.Sn) 4 O 9 and Ba 2 (Ti.Sn) 9 O 20 , said dielectric ceramic composition having a resonance frequency coefficient at a temperature of -40° to 80° C. in the range of +3 ppm/°C. to 0 ppm/°C. and a nearly linear resonance frequency temperature characteristic.
Claim 2
Dependent Claim
92 words
A dielectric ceramic composition consisting of three components, namely, BaO, TiO 2 , and SnO 2 , being expressed by the formula BaO.x{(1-y)TiO 2 .ySnO 2 }, wherein x is 4.4 mole, and y is from 0.06 to 0.09, and having a mixed crystal structure of Ba(Ti.Sn) 4 O 9 and Ba 2 (Ti.Sn) 9 O 20 , said dielectric ceramic composition having a resonance frequency coefficient at a temperature of -40° to 80° C. in the range of +3 ppm/°C. to 0 ppm/°C. and a nearly linear resonance frequency temperature characteristic.
Claim 3
Dependent Claim
21 words
A component of a microwave circuit of from 300 MHz to 30 GHz comprising said dielectric ceramic composition of claim 1.
Claim 4
Dependent Claim
11 words
A temperature-compensation ceramic capacitor comprising said dielectric composition of claim 1.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |