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EP0468801A2
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Distributed constant circuit board using ceramic substrate material
Assignee: NGK Insulators Ltd
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Filing: 1991-07-25
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Granted: —
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Expires: 2011-07-25
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 10mΩ 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 from -30ppm/°C to +100ppm/°C.
Inventors
- 👤 Shinsuke Yano
- 👤 Hirofumi Yamaguchi
- 👤 Takami Hirai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:05
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: 10
Claim 1
Independent Claim
119 words
A circuit board including a ceramic substrate, and at least one conductor pattern which is carried by said ceramic substrate and which forms a resonance circuit, an inductor, a capacitor or a strip transmission line, characterised in that: said at least one 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 10mΩ per square, said at least one conductor pattern being formed by co-firing with said ceramic substrate; and said ceramic substrate consists principally of a ceramic composition which gives the resonance circuit a resonance frequency whose temperature coefficient is held within a range between -30ppm/°C and +100ppm/°C.
Claim 2
Dependent Claim
27 words
A distributed constant circuit board according to claim 1, characterised in that said ceramic composition contains at least 5% by weight of a TiO₂ powder dispersed therein.
Claim 3
Dependent Claim
30 words
A distributed constant circuit board according to claim 2, characterised in that said TiO₂ powder is calcined so as to give a BET specific surface area not larger than 2m²/g.
Claim 4
Dependent Claim
26 words
A distributed constant circuit board according to any one of claims 1-3, characterised in that said ceramic composition has a sintering temperature not higher than 1100°C.
Claim 5
Dependent Claim
32 words
A distributed constant circuit board according to any one of claims 1-4, characterised in that said ceramic composition comprises a mixture of an amorphous or crystallized glass powder and a TiO₂ powder.
Claim 6
Dependent Claim
26 words
A distributed constant circuit board according to claim 5, characterised in that said amorphous or crystallized glass powder has a dielectric constant not higher than 20.
Claim 7
Dependent Claim
48 words
A distributed constant circuit board according to claim 5 or 6, characterised in that said ceramic composition further comprises a filler in the form of a powder selecting from the group consisting of: alumina; mullite; cordierite, forsterite; quartz; quartz glass; zircon; zirconia; and RE₂Ti₂O₇ (RE: rare earth elements).
Claim 8
Dependent Claim
22 words
A distributed constant circuit board according to claim 7, characterised in that said filler has a dielectric constant not higher than 50.
Claim 9
Dependent Claim
46 words
A distributed constant circuit board according to any one of claims 1-4, characterised in that said ceramic composition comprises a mixture of a TiO₂ powder, and a ceramic material selected from the group consisting of: boric acid; an oxide of alkaline earth metal; and silicic acid.
Claim 10
Dependent Claim
48 words
A distributed constant circuit board according to any one of claims 1-9, characterised in that said major component of said electrically conductive composition 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.
References Cited (Backward Citations)
No citation records indexed.
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