| 摘要 |
PROBLEM TO BE SOLVED: To provide a high frequency component or the like in which an insertion loss in a required fundamental frequency band is suppressed to a minimum, a higher harmonic wave attenuation quantity in an unwanted frequency band is maximized, and an electrostatic surge is performed. SOLUTION: The high frequency component has: a branch circuit for branching a signal to a plurality of transmitting-receiving systems with different passbands; a switch circuit for switching a transmitting system and a receiving system to each transmitting-receiving system; a switch circuit having a low-pass filter in each transmitting system of the said switch circuit; and a high frequency amplifier circuit having a semiconductor device, a power supply circuit and a matching circuit. A phase matching circuit composed of a high-pass filter is provided between an output matching circuit of the high frequency amplifier circuit and a transmitting terminal of the switch circuit. Matching of the switch circuit and the high frequency amplifier circuit is in a relation of phases corresponding to conjugate matching in the necessary fundamental frequency band but phases are matched into a relation corresponding nonconjugate matching in unwanted double or triple frequency bands. At the same time, the high-pass filter may take measures to cope with the electrostatic surge. COPYRIGHT: (C)2004,JPO
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