Fuji Electrochemical Co., Ltd.

Kazuaki Endo

Kazuhisa Yamazaki

Mitsuru Kojima

Yasuo Suzuki

Utsuo Kihara

Nobuaki Nakamura

Michiaki Tsurumi

Kenji Fujimoto

Yasue Nishino

Dielectric filter and method of manufacturing the same

Laminated dielectric resonator and filter

The present invention provides a dielectric ceramic composition for use in a high-frequency range represented by the general formula (1-x)Ba.sub.1- y(Zn.sub.1/3, Ta.sub.2/3)O.sub.3 +xBa.sub.1-y ZrO.sub.3. In the formula, y is 0.004.ltoreq.y.ltoreq.0.013 and x is the amount of substitution of Ba.sub.1-y ZrO.sub.3 and 0&lt;x.ltoreq.0.06. This composition is prepared by weighing raw materials so that the mixing ratio of Ba is slightly smaller than that of the stoichiometric composition, calcining the resultant mixture to prepare a calcination product, grinding the calcination product through only dry process without conducting wet pulverization, molding the resultant powder, and sintering the molded product at 1600.degree. to 1700.degree. C. for 1 to 10 hr.

Dielectric ceramic composition for use in high-frequency range and

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Kosai, Japan

Kazuaki Endo