High-frequency porcelain composition, process for producing the same and planar high-frequency circuit
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United States of America Patent
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May 6, 2008
Grant Date -
Feb 1, 2007
app pub date -
May 28, 2004
filing date -
May 30, 2003
priority date (Note) -
Expired
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Abstract
A sintering temperature can be lowered to 1,200.degree. C. by adding from 15% by weight or more to 35% by weight or less of rutile-type titanium dioxide into forsterite. By carrying out sintering at such a low temperature, a sintered product can be obtained in which sintering was carried out while retaining the respective crystal phases of the forsterite and rutile-type titanium dioxide. Such a sintered product is an excellent high-frequency ceramic composition, wherein the high quality factor Qf value derived from forsterite is hardly impaired, and, the absolute value of the temperature coefficient .tau..sub.f is controlled to 30 ppm/.degree. C. or less by rutile-type titanium dioxide.
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