| 摘要 |
Two trap circuits different in frequencies at which short-circuit is established are provided in an output matching circuit. Out of the two trap circuits, the trap circuit higher in frequency at which short-circuit is established is arranged closer to a power amplification element. Thus, a frequency band higher than a frequency twice as high as a central frequency of a transmission frequency band is trapped, impedance of the output matching circuit with respect to the frequency in a frequency band twice as high as the transmission frequency band on the side of an output end of the power amplification element is kept in a state close to short-circuit, and the trap circuit lower in frequency at which short-circuit is established traps the frequency band lower than the frequency twice as high as the central frequency of the transmission frequency band.
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