Dielectric porcelain and resonator using the same
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United States of America Patent
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Jun 29, 2004
Grant Date -
Oct 24, 2002
app pub date -
Nov 15, 2001
filing date -
Nov 20, 2000
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Abstract
The dielectric porcelain of the present invention comprises a polycrystalline material of which a main component comprises oxides containing at least a rare earth element (Ln), Al, M (M represents Ca and/or Sr) and Ti as metal elements, wherein the thickness of a grain boundary layer is 20 nm or less, thereby achieving a high value of .epsilon.r, high Q factor and small absolute value of the temperature coefficient .tau..sub.f of resonant frequency in a high frequency region. Thus this dielectric porcelain is preferably used in dielectric resonators.
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