US4485180A
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High frequency dielectric ceramic compositions
Assignee: Murata Manufacturing Co Ltd
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Filing: 1983-08-30
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Granted: 1984-11-27
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Expires: 2003-08-30
Abstract
Abstract A high frequency dielectric ceramic composition is described, said composition being represented by the formula: Ba(Zr x Zn y Ta z )O 7/2-x/2-3y/2 , wherein 0.02≦x≦0.13, 0.28≦y≦0.33 and 0.59≦z≦0.65 (where x+y+z=1). The ceramic composition has a complex perovskite structure, provides a high dielectricity and high Q value at high frequency and selectively provides a temperature coefficient of resonant frequency with a center value of 0 ppm/°C., without using high sintering temperatures and/or long sintering times.
Inventors
- 👤 Takehiro Konoike
- 👤 Hiroshi Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; H; H01; H01P; H01P7/00; H01P7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A high frequency dielectric ceramic composition, said composition being represented by the formula: Ba(Zr x Zn y Ta z )O 7/2-x/2-3y/2 , wherein 0.02≦x≦0.13, 0.28≦y≦0.33 and 0.59≦z≦0.65 (where x+y+z=1), said composition having a Q value significantly enhanced by the inclusion of Zr.
Claim 2
Dependent Claim
42 words
A high frequency dielectric ceramic composition, said composition being represented by the formula: Ba(Zr x Zn y Ta z )O 7/2-x/2-3y/2 , wherein 0.02≦x≦0.13, 0.28≦y≦0.33 and 0.59≦z≦0.65 (where x+y+z=1), said composition having a Q value significantly enhanced by the inclusion of Zr.
Claim 3
Dependent Claim
24 words
The high frequency dielectric ceramic composition of claim 1, wherein at most 70 atom% of Zn is substituted by Ni, Co or mixtures thereof.
Claim 4
Dependent Claim
34 words
The high frequency dielectric ceramic composition of claim 2, wherein said composition further contains 0.1 to 10.0 mol% of at least one of the lanthanide oxides having the formula: Me 2 O 3 .
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |