Patent ID: 7397332

Claim:
A high-frequency dielectric ceramic composition comprising: 100 parts by weight of main component and 0.005-0.300 parts by weight (on a B 2 O 3 basis) of a boron-containing compound, wherein the main component has a composition formula of (1−y)xCaTi a O 1+2a -(1−y)(1−x)Ca(M1 z/3 M2 2/3 ) b O 1+2b -yLnAl c O (3+3c)/2 , in which M1 is at least one of Zn and Mg, M2 is at least one of Nb and Ta, Ln is at least one of Y, La, Nd, Sm and Pr, α=(1−y)x, x and y denote moles, and x, y, z, a, b, c, and α satisfy the following relationships: 0.56≦x≦0.8; 0.08≦y≦0.18; 0.980≦z<1.000; α≦0.65; 0.985≦a≦1.05; 0.9≦b≦1.02; and 0.9≦c≦1.05.