Abstract: Dielectric ceramic compositions for microwave application which are expressed as (1-x)ZnNb2O6- xTiO2 and designed with mole fractions of TiO2 (x=0.2 to 0.8). CuO of 0.5 to 12.0 % by weight of the total weight of the compositions is added to the compositions. At least one additive oxide of 0.05 to 5.0% by weight of the total weight among V2O5, Sb2O5, Bi2O3, B2O3, NiO, WO3, AgNO3, ZnO, and MgO is added to the compositions. They have good sintering and dielectric characteristics and made through simple manufacturing processes, and lower the production costs.

Abstract: Provided with a dielectric ceramic composition for microwaves having the formula represented by yMgTa.sub.2-x O.sub.6-5/2x +(1-y)ZnNb.sub.2 O.sub.6 +wC, wherein 0<x.ltoreq.0.8, 0.1.ltoreq.y.ltoreq.1, 0.ltoreq.w.ltoreq.2 wt %, and C is at least one selected from a group consisting of Sb.sub.2 O.sub.5, CuO, ZnO, NiO, MgO, SrCO.sub.3, BaCO.sub.3, ZrO.sub.2, WO.sub.3, and TiO.sub.2, the composition having a low permittivity of 20-30, a quality factor almost equal to that of Ba(Zn,Ta)O.sub.3 families, and a relatively excellent sintering characteristic, thus particularly suitable for dielectric resonators in a high frequency band above 10 GHz.