Dielectric ceramic composition and multilayer microwave device employing the same.

摘要

A dielectric ceramic composition which consists essentially of bismuth oxide, calcium oxide and niobium oxide, wherein when the dielectric ceramic composition is expressed by a formula xBiO3/2-yCaO-zNbO5/2 and the x, y and z are plotted in a ternary system diagram so as to total 1.0, the x, y and z fall in a region enclosed by a pentagon having the following vertexes A, B, C, D and E, A: (x, y, z) = (0.55, 0.16, 0.29> B: (x, y, z) = (0.5, 0.21, 0.29> C: (x, y, z) = (0.44, 0.24, 0.32> D: (x, y, z) = (0.44, 0.2, 0.36) and E: (x, y, z) = (0.5, 0.175, 0.325); and a multilayer microwave device including a dielectric layer (1) formed by the dielectric ceramic composition. <IMAGE>