Dielectric ceramic composition and dielectric resonator using the same

摘要

PCT No. PCT/JP98/01512 Sec. 371 Date Dec. 1, 1998 Sec. 102(e) Date Dec. 1, 1998 PCT Filed Apr. 2, 1998 PCT Pub. No. WO98/43924 PCT Pub. Date Oct. 8, 1998The present invention provides a dielectric ceramic composition having a high dielectric constant and a high Q value in high frequency ranges, and also having a temperature coefficient tau f of resonance frequency capable of being controlled stably in a small range. The dielectric ceramic composition contains at least lanthanide Ln, Al, Sr and Ti as metal elements, and has a composition for the metal elements, represented by the composition formula of aLn2Ox.bAl2O3.cSrO.dTiO2, wherein a, b, c, d and x are confined as follows in mole ratio: 0.2194