US4992398A
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High frequency dielectric composition
Assignee: CTS Corp
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Filing: 1989-12-29
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Granted: 1991-02-12
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Expires: 2009-12-29
Abstract
Abstract A high-frequency dielectric ceramic compound having a perovskite-type crystal structure comprising a chemical composition substantially represented by the formula (Sr x Ca y Mn z )TiO 3 in which 0.98<x+y+z<1.02,0.34<y<0.4, and 0.0075<z<0.015, and possessing a non-linear temperature coefficient is set forth. A method is presented for utilizing the compound to formulate a high-frequency dielectric material, the formulated material being particularly suitable for providing filters and related applications with a relatively low resonant frequency temperature coefficient.
Inventors
- 👤 Rong-Fong Huang
- 👤 Dean Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A dielectric ceramic consisting substantially of a solid solution titanate having a perovskite-type crystal structure, said titanate having the composition represented by the following general formula: (Sr.sub.x Ca.sub.y Mn.sub.z)TiO.sub.3 wherein x, y, and z are numbers represented respectively by the expressions 0.98<x+y+z<1.02, 0.34<y<0.4, and 0.0075<z<0.015.
Claim 2
Dependent Claim
45 words
A dielectric ceramic consisting substantially of a solid solution titanate having a perovskite-type crystal structure, said titanate having the composition represented by the following general formula: (Sr.sub.x Ca.sub.y Mn.sub.z)TiO.sub.3 wherein x, y, and z are numbers represented respectively by the expressions 0.98<x+y+z<1.02, 0.34<y<0.4, and 0.0075<z<0.015.
Claim 3
Dependent Claim
18 words
The dielectric ceramic of claim 1, wherein the dielectric constant of the dielectric ceramic is greater than 200.
Claim 4
Dependent Claim
18 words
The dielectric ceramic of claim 1, wherein the dielectric Q of the dielectric ceramic is greater than 1000.
Claim 5
Dependent Claim
32 words
The dielectric ceramic of claim 1, wherein the average resonant frequency coefficient of the dielectric ceramic is less than 400 ppm/°C. for the temperature range of -35 ° C. to +65° C.
References Cited (Backward Citations)
CA835859A
Cited
JPS5441700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |