Other

Sumio Terada

Koichi Fukuda

Takafumi Kawano

Masataka Yamanaga

Shinji Fukuda

The dielectric ceramic composition of the first aspect of the invention comprises an essential component having a compositional formula of xBaO-yTiO -zNd O (wherein 0.02&lE;x&lE;0.2, 0.6&lE;y&lE;0.8, 0.01&lE;z&lE;0.3, x&plus;y&plus;z&equals;1), and contains two types of glass powder, one comprising PbO, ZnO and B O and the other comprising SiO and B O , and a third component that comprises Al O , SrTiO , GeO and Li O. Its advantages are that it can be sintered at low temperatures, its dielectric constant &egr; falls between 10 and 50 or so, its unloaded Q is large, and its temperature-dependent resonant frequency change is small. The dielectric ceramic composition of the second aspect of the invention comprises an essential component having a compositional formula of s(xBaO-yTiO -zNd O )-tNd Ti O (wherein 0.02&lE;x&lE;0.2, 0.6&lE;y&lE;0.8, 0.01&lE;z&lE;0.3, x&plus;y&plus;z&equals;1, 0.1&lE;s&lE;0.8, 0.2&lE;t&lE;0.9, s&plus;t&equals;1), and contains two types of glass powder, one comprising PbO, ZnO and B O and the other comprising SiO and B O , and a third component that comprises Al O , SrTiO , GeO and Li O. Its advantages are that it can be sintered at low temperatures, its dielectric constant &egr; falls between 10 and 50 or so, its unloaded Q is large, and its absolute value of a temperature coefficient of resonant frequency &tgr; is small. Still another advantage of the composition is that its relative dielectric constant &egr; , its unloaded Q and its temperature coefficient of resonant frequency (&tgr; ) can be controlled in any desired manner by controlling the Nd Ti O content of the composition.

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Yamaguchi, Japan

Sumio Terada