Electronics and Telecommunications Research Institute

Korea Telecommunication Authority

Suk-Jin Lee

Jung-Rae Park

Tae-Hong Kim

Tae-Goo Choy

Sang-Seok Lee

Tae-Goo Choi

The present invention relates to a dielectric ceramic composition for microwave which consists of BaO, Sm.sub.2 O.sub.3, TiO.sub.2 and PbO, and has a compositional formula of x(Ba.sub.1-.alpha., Pb.sub..alpha.)O-- ySm.sub.2 O.sub.3 -zTiO.sub.2, wherein 6 mol % .ltoreq.x.ltoreq.20 mol %, 6 mol %.ltoreq.y.ltoreq.20 mol %, 60 mol %.ltoreq.z.ltoreq.75 mol % and 0 mol % .ltoreq..alpha..ltoreq.0.2 mol %. Accordingly, since the dielectric ceramic composition for microwave according to the present invention has the dielectric constant more than 85, the temperature factor of the resonant frequency within .+-.5 ppm/.degree.C., and the quality factor more than 6000 in 1 GHz, it can be utilized in the filter for microwave, the dielectric for the resonator, the laminated ceramic capacitor, the dielectric for the filter for electromagnetic wave obstacle and the dielectric for capacitor. And also, since it is possible to reduce the problems to the volatilization of the plumbic oxide and the bismuth oxide, the dielectric ceramic composition for microwave according to the present invention can be made by a general manufacturing process and can reduce the use of the elements detrimental to the human body.

Dielectric ceramic composition for microwave

The present invention relates to dielectric ceramic compositions for microwave applications consisting of BaO, PbO, Nd.sub.2 O.sub.3, CeO.sub.2, La.sub.2 O.sub.3 and TiO.sub.2 or consisting of compositions including these elements and having a composition formula (I).

Dielectric ceramic compositions for microwave

Growing community of inventors

Daejeon, South Korea

Suk-Jin Lee