Patent ID: 6864764

Claim:
A dielectric resonator comprising: a dielectric board; a dielectric supporting member; and a dielectric porcelain for resonance having a higher dielectric constant than that of the supporting member, the dielectric porcelain provided on the dielectric board via the dielectric supporting member, the dielectric board and/or the dielectric supporting member comprising a dielectric porcelain composition which comprises, as a principal component, a complex oxide having a molar composition xMgO·yAl 2 O 3 ·zSiO 2 , wherein 10≦x≦40, 10≦y≦40, 20≦z≦80, and x+y+z=100, a primary crystalline phase of the complex oxide being a2MgO·2Al 2 O 3 ·5SiO 2 phase, and a ratio of a (241) peak intensity βp(241) and a (222) peak intensity βp(222) of X-ray diffraction of a β phase of the primary crystalline phase being 0.8≦βp(241)/βp(222)≦1.3.