05238887 is referenced by 7 patents and cites 11 patents.

Disclosed herein is a ceramic composition which gives a microwave dielectric having a permittivity and unloaded Q in a practical range and a small temperature coefficient (.tau.f) in the neighborhood of zero of resonance frequency owing to the controlled amount of ZnO and Ta.sub.2 O.sub.5 added. The .tau.f value may be positive or negative in the neighborhood of zero according to need. The ceramic composition comprises a principal component represented by (BaO-3.7TiO.sub.2).xZnO, where x is in the range of 15.ltoreq.x.ltoreq.17 wt % and a secondary component containing 2-6 wt % Ta.sub.2 O.sub.5 and not more than 1 wt % MnO.sub.2 based on the amount of the principal component. The ceramic composition may also contain BaO-3.8TiO.sub.2, 12-16 wt % ZnO, and 2-6 wt % Ta.sub.2 O.sub.5, or contain BaO-3.6TiO.sub.2, 17-19 wt % ZnO, and 2-6 wt % Ta.sub.2 O.sub.5.

Title
Ceramic composition for microwave dielectric
Application Number
7/907640
Publication Number
5238887
Application Date
July 2, 1992
Publication Date
August 24, 1993
Inventor
Hirofumi Ozeki
Nagoya
JP
Tokiomi Kato
Nagoya
JP
Agent
Finnegan Henderson Farabow Garrett & Dunner
Assignee
NGK Spark Plug Company
JP
IPC
C04B 35/46
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