| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-pass filter circuit and a high-frequency communication apparatus capable of improving the steepness of a boundary between a passing band and an attenuation band without increasing the circuit scale. SOLUTION: The circuit is provided with a plurality of capacitance elements C1a, C2a, C3a which are serially connected between input and output, a high-pass filter section 1a having inductance elements L1a, L2a which are connected between the ends of the plurality of capacitance elements C1a, C2a, C3a and a ground, an inductance element L3a connected between the input side of the section 1a and an input port IN, and an inductance element L4a connected between the output side of the section 1a and an output port OUT. The input port IN is coupled with the output port OUT by mutual induction magnetic field coupling of the inductance elements L3a and L4a, and the directions of the mutual induction magnetic field coupling are made in mutually opposite directions. COPYRIGHT: (C)2004,JPO&NCIPI
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