| 摘要 |
PROBLEM TO BE SOLVED: To provide a small LC high-pass filter circuit with a high Q and an excellent frequency characteristic, a laminated LC high-pass filter, as well as a multiplexer and radio communication equipment. SOLUTION: Via holes 20a and 20b for inductance form a cylindrical inductor L3 in a laminating direction of insulation sheets 2 to 8. A via hole 21 and via hole 22 constitute a cylindrical inductor L1 and a cylindrical inductor L2, respectively. Axial directions of these cylindrical inductors L1 to L3 are perpendicular to the surfaces of the insulation sheets 2 to 8. A capacitor L1 for high-pass filter and the inductor L1 constitute a high-pass filter circuit HPF 1, and a capacitor C2 for high-pass filter and the inductor L2 constitute a high-pass filter circuit HPF 2. Furthermore, a series circuit with a trap capacitor C5 and the inductor L3 constitutes a trap circuit T. COPYRIGHT: (C)2003,JPO
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