| 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 xBaO.yTiO2.z[(1-a)RE2O3.aBi2O3] where RE represents at least one rare earth metal, 0.10</=x</=0.20, 0.60</=y</=0.75, 0.10</=z</=0.25, x+y+z=1 and 0<a</=0.3; and a glass composition composed of ZnO, B2O3 and SiO2, which is represented by k(wt. %)ZnO.m(wt. %)B2O3.n(wt. %)SiO2 where 30</=k</=85, 5</=m</=50, 2</=n</=40, 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<a</=0.2) 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.
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