| 摘要 |
A high-frequency dielectric ceramic composition that has excellent dielectric properties, such as a large epsilon<SUB>r</SUB>, a large Q-value, and a small absolute value of tau<SUB>f</SUB>, even in a high-frequency region, such as a microwave region or a millimeter wave region, and that can be fired at 1400° C. or less, which is much lower than before, is provided. The high-frequency dielectric ceramic composition contains 100 parts by weight of main component and 0.005-0.300 parts by weight (on a B<SUB>2</SUB>O<SUB>3 </SUB>basis) of accessory boron compound. The main component has a composition formula of (1-y)xCaTi<SUB>a</SUB>O<SUB>1+2a</SUB>-(1-y)(1-x)Ca(M1<SUB>z/3</SUB>M2<SUB>2/3</SUB>)<SUB>b</SUB>O<SUB>1+2b</SUB>-yLnAl<SUB>c</SUB>O<SUB>(3+3c)/2</SUB>, wherein x and y denote moles , and x, y, z, a, b, c, and alpha (wherein alpha=(1-y)x) satisfy the following relationships: 0.56<=x<=0.8, 0.08<=y<=0.18, 0.980<=z<1.000, alpha<=0.65, 0.985<=a<=1.05, 0.9<=b<=1.02, and 0.9<=c<=1.05.
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