Patent ID: 7655588

Claim:
A dielectric porcelain composition, characterized by containing 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 indicative of a molar ratio of BaO, Nd 2 O 3 , and TiO 2 are in ranges of 9 (mol %)≦ x≦ 22 (mol %) 9 (mol %)≦ y≦ 29 (mol %) 61 (mol %)≦ z≦ 74 (mol %) and have a relation of x+y+z=100 (mol %), and α and β indicative of a volume ratio of each component in said main component composition are in ranges of 15 (vol %)≦α≦75 (vol %) 25 (vol %)≦β≦85 (vol %) and have a relation of α+β=100 (vol %), wherein a zinc oxide, a boron oxide, a copper oxide and an alkaline earth metal oxide are contained as subordinate components relative to said main component composition, and when said subordinate components are represented by aZnO, bB 2 O 3 , cCuO and dRO (R is an alkaline earth metal), a, b, c and d indicative of a weight ratio of each subordinate component relative to said main component composition have relations of 0.1 (wt %)≦ a≦ 12.0 (wt %) 0.1 (wt %)≦ b≦ 12.0 (wt %) 0.1 (wt %)≦ c≦ 9.0 (wt %) 0.2 (wt %)≦ d≦ 5.0 (wt %) and wherein dielectric porcelain composition further contains Ag as an additional subordinate component.