| 摘要 |
A dielectric ceramic composition which contains a rare earth element (Ln), Al, Ca and Ti as metal elements and which when these components are expressed in terms of a mole ratio as aLn2Ox.bAl2O3. cCaO.dTiO2, the values of a, b, c, d and x satisfy a+b+c+d=1, 0.056</=a</=0.214, 0.056</=b</=0.214, 0.286</=c</=0.500, 0.230</=d</=0.470, and 3</=x</=4. The dielectric having the above composition is disposed between a pair of input and output terminals to constitute a dielectric resonator. The dielectric ceramic composition exhibits such dielectric properties as a large dielectric constant at high frequencies, a large Q-value and a small temperature coefficient of resonance frequency. Satisfactory properties are exhibited when the dielectric ceramic composition is used for a resonator or as a material of circuit board for high-frequency applications.
|
