High-frequency dielectric ceramic composition, dielectric resonator, dielectric filter, dielectric duplexer, and communication apparatus

摘要

A high-frequency dielectric ceramic composition that has excellent dielectric properties, such as a large ε_r, a large Q-value, and a small absolute value of τ_f, 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 B₂O₃ basis) of accessory boron compound. The main component has a composition formula of (1−y)xCaTi_aO_1+2a−(1−y)(1−x)Ca(M1_z/3M2_2/3)_bO_1+2b-yLnAl_cO_(3+3c)/2, wherein x and y denote moles , and x, y, z, a, b, c, and α (wherein α=(1−y)x) satisfy the following relationships: 0.56≦x≦0.8, 0.08≦y≦0.18, 0.980≦z1.000, α≦0.65, 0.985≦a≦1.05, 0.9≦b≦1.02, and 0.9≦c≦1.05.