Dielectric ceramic composition containing ZnO-B.sub.2 O.sub.3 - SiO.sub.2 glass, method of preparing the same, and resonator and filter using the dielectric ceramic composition

摘要

A dielectric ceramic composition is disclosed which consists essentially of: a main ceramic composition containing barium oxide, titanium oxide, rare earth oxide and bismuth oxide as major components, which composition is represented by xBaOyTiO.sub.2 z[(1- a)RE.sub.2 O.sub.3 aBi.sub.2 O.sub.3 ] where RE represents at least one rare earth metal, 0.10x0.20, 0.60y. ltoreq.0.75, 0. 10 z0.25, x+y+z=1 and 0 a0.3; and a glass composition composed of ZnO, B.sub.2 O.sub.3 and SiO.sub.2, which is represented by k(wt. %)ZnOm(wt. %)B.sub.2 O.sub.3 . multidot.n(wt. %)SiO.sub.2 where 30 k85, 5m. ltoreq.50, 2n40, k+m+n=100. The glass composition is contained in an amount of at least 0.1 part by weight, but not more than (18-62.5a) parts by weight (where 0 a0. 2) or not more than 5. 5 parts by weight (where 0.2 a 0.3), per 100 parts by weight of the main ceramic composition. The main ceramic composition may have another combination of major components. Also disclosed are a method of preparing the dielectric ceramic composition as described above, a dielectric resonator and filter using such a dielectric ceramic composition, and a method of producing such a dielectric resonator or filter.