Patent ID: 7517823

Claim:
A dielectric porcelain composition, comprising, as a main component composition, a component represented by a composition formula {α(xBaO.yNd 2 O 3 .zTiO 2 )+β(2MgO.SiO 2 )} wherein x, y and z are indicative of a molar ratio of BaO, Nd 2 O 3 , and TiO 2 , are in ranges of 14 (mol %)≦x≦19 (mol %), 11.7 (mol %)≦y≦17 (mol %), 65 (mol %)≦z≦71 (mol %), and have a relation of x+y+z=100 (mol %); and α and β are indicative of a volume ratio of each component in said main component composition, are in ranges of 25 (vol %)≦α<65 (vol %), 35 (vol %)<β≦75 (vol %), and have a relation of α+β=100 (vol %), wherein a zinc oxide, a boron oxide and a copper oxide are present as subordinate components relative to said main component composition, and when said subordinate components are represented by aZnO, bB 2 O 3 and cCuO, a, b and c are indicative of a weight ratio of each subordinate component relative to said main component composition and have relations of 0.05 (wt %)< a≦ 17.0 (wt %), 0.05 (wt %)< b≦ 17.0 (wt %), and 0.05 (wt %)< c≦ 14.0 (wt %).