US5232765A
Expired / Lapsed
US
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Distributed constant circuit board using ceramic substrate material
Assignee: NGK Insulators Ltd
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Filing: 1991-07-22
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Granted: 1993-08-03
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Expires: 2011-07-22
Abstract
Abstract A distributed constant circuit board including a ceramic substrate, and at least one conductor pattern which is carried by the ceramic substrate and which forms a resonance circuit, an inductor, a capacitor or strip transmission line. The conductor pattern has an electrically conductive composition whose major component is selected from the group consisting of Ag, Au and Cu, and which has a sheet resistivity not higher than 10 mΩ per square. The conductor is formed by co-firing with the ceramic substrate, so that the conductor pattern is incorporated in the substrate. The ceramic substrate is formed principally of a ceramic composition which gives the resonance circuit a resonance frequency whose temperature coefficient is held within a range between -30 ppm/° C. and +100 ppm/° C.
Inventors
- 👤 Shinsuke Yano
- 👤 Hirofumi Yamaguchi
- 👤 Takami Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:38
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P3/00; H01P3/02; H01P3/08; H01P3/088; H10; H10W; H10W44/00; H10W44/20; H05K1/0213; H05K1/0237; H05K1/024; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926; Y10T428/25; Y10T428/252; Y10T428/26; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A distributed constant circuit board, comprising: a ceramic substrate consisting essentially of a ceramic composition including at least 5% by weight of TiO 2 powder, wherein particles of said TiO 2 powder are dispersed in said ceramic substrate; and a microwave integrated circuit buried in said ceramic substrate, said microwave integrated circuit forming at least one of a resonance circuit, an inductor, a capacitor and a strip transmission line and having a major component selected from the group consisting of Ag, Au and Cu, said microwave integrated circuit having a sheet resistivity not higher than 10 mΩ per square; wherein said ceramic composition of said ceramic substrate yields a temperature coefficient between -30 ppm/° C. and +100 ppm/° C. of such a resonance circuit, said microwave integrated circuit is co-fired with a green sheet of said ceramic substrate, and a sintering temperature of the ceramic substrate is not higher than 1100° C.
Claim 2
Dependent Claim
152 words
A distributed constant circuit board, comprising: a ceramic substrate consisting essentially of a ceramic composition including at least 5% by weight of TiO 2 powder, wherein particles of said TiO 2 powder are dispersed in said ceramic substrate; and a microwave integrated circuit buried in said ceramic substrate, said microwave integrated circuit forming at least one of a resonance circuit, an inductor, a capacitor and a strip transmission line and having a major component selected from the group consisting of Ag, Au and Cu, said microwave integrated circuit having a sheet resistivity not higher than 10 mΩ per square; wherein said ceramic composition of said ceramic substrate yields a temperature coefficient between -30 ppm/° C. and +100 ppm/° C. of such a resonance circuit, said microwave integrated circuit is co-fired with a green sheet of said ceramic substrate, and a sintering temperature of the ceramic substrate is not higher than 1100° C.
Claim 3
Dependent Claim
31 words
A distributed constant circuit board of claim 1, wherein said TiO 2 powder is calcined so as to give a BET specific surface area not larger than 2 m 2 /g.
Claim 4
Dependent Claim
41 words
A distributed constant circuit board of claim 1, wherein said ceramic composition comprises a mixture of an amorphous or crystallized glass powder and said TiO 2 powder, said amorphous or crystallized glass powder having a dielectric constant not higher than 20.
Claim 5
Dependent Claim
64 words
A distributed constant circuit board according to claim 3, wherein said ceramic composition further comprises a filler in the form of a powder selected from the group consisting of: alumina; mullite; cordierite, forsterite; quartz; quartz glass; zircon; zirconia; and RE 2 Ti 2 O 7 wherein RE is one or more rare earth elements, said filler having a dielectric constant not higher than 50.
Claim 6
Dependent Claim
41 words
A distributed constant circuit board of claim 1, wherein said ceramic composition comprises a mixture of a TiO 2 powder, and said ceramic material selected from the group consisting of: boric acid; an oxide of alkaline earth metal; and silicic acid.
Claim 7
Dependent Claim
42 words
A distributed constant circuit board of claim 1, wherein said major component of said microwave integrated circuit is selected from the group consisting of: Ag; Ag-Pt alloy; Ag-Pd alloy; Ag-Pt-Pd alloy; Cu; Cu-based alloy; Au; Au-Pt alloy; Au-Pd alloy; and Au-Pt-Pd alloy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |