| 摘要 |
A ceramic composition having a high value epsilon r while maintaining Qu and tau f each in a range of practical characteristic. The present invention is applicable to dielectric resonators and impedance matching of various kinds of microwave circuits. The ceramic composition comprises Ba1-xSrx (Zn1/3Nb2/3)O3 (in which 0.6</=x</=1.0) as the main ingredient, to which TiO2 is incorporated by 0.01 to 1 parts by weight based on 100 parts by weight of the main ingredient. The ceramic composition may have a Qu value of 2000 to 2900 (at 4.5 GHz), relative dielectric constant of 39 to 42, and a temperature constant of resonance frequency ( tau f) in the range of -8 to +10 ppm/ DEG C. The ceramic composition may not contain Sr5Nb4O15 or Ba4Nb2O9. It may index for the regularity of the B site ingredient of 7-9x10-2. The ceramic composition may be prepared by calcination, sintering, and an annealing treatment after sintering. A calcination atmosphere and a sintering atmosphere may be ZnO atmosphere.
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