Patent ID: 7098160

Claim:
A dielectric ceramic composition comprising: a main ingredient consisting essentially of bismuth oxide, calcium oxide and niobium oxide and expressed by a formula xBiO 3/2 -yCaO-zNbO 5/2 (x, y, z are in molar ratio, and x+y+z=1.0), wherein x, y, and z are in a scope of region enclosed by a quadrilateral having following vertices A, B, C and D in a ternary system diagram of the main ingredient, A: (x, y, z)=(0.48, 0.184, 0.336) B: (x, y, z)=(0.48, 0.22, 0.30) C: (x, y, z)=(0.44, 0.24, 0.32) D: (x, y z)=(0.44, 0.20, 0.36), and a glass composition including at least 0.05 wt % and at most 2 wt % of uSiO 2 -vLi 2 O-wMO (u, v, w are in weight percentage, u+v+w=100, and M is at least one of Ca, Sr and Ba).