Distributed constant circuit board using ceramic substrate material
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United States of America Patent
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Aug 3, 1993
Grant Date -
N/A
app pub date -
Jul 22, 1991
filing date -
Jul 25, 1990
priority date (Note) -
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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 m.OMEGA. 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/.degree. C. and +100 ppm/.degree. C.
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