| 摘要 |
PROBLEM TO BE SOLVED: To achieve a transmission circuit capable of suppressing a higher harmonic wave interfering with a non-operating amplifier, while occurring in an operating amplifier in the transmission circuit with a plurality of the amplifiers having different transmission frequency bands, and to provide a higher harmonic wave suppression method. SOLUTION: The transmission circuit is provided with a phase-shifter 8 which shifts a phase of a current in a higher harmonic wave 7A in output signals of an operating transmission power amplifier 1, a phase-shifter 9 which shifts a phase of a current in a higher harmonic wave 7B interfering with a non-operating transmission power amplifier 2, and a coupling circuit 10 for coupling the higher harmonic waves 7A, 7B which are respectively phase-shifted by each of the phase-shifting parts 8, 9 with each other. By this, it is possible to suppress the higher harmonic wave 7B interfering with the non-operating transmission power amplifier 2, while occurring in the operating transmission power amplifier 1. COPYRIGHT: (C)2007,JPO&INPIT
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