| 摘要 |
PROBLEM TO BE SOLVED: To provide a power amplifier for high frequencies capable of facilitating countermeasures to high efficiency and high performance by improving ACP without adding any new circuit in response to the high demand of higher performance. SOLUTION: This power amplifier for high frequencies is provided with a high frequency transistor Q11, an input matching circuit 12, an output matching circuit 13, and a drain microstrip line L12, and the output matching circuit 13 is constituted of distributed constant lines L13 divided in the middle and a wire for connecting those divided distributed constant lines L13. A parallel resonance circuit 18 is constituted of the distributed constant lines L13 divided in the middle and the wire for connecting them, and the resonance frequencies are matched with the frequencies of a higher harmonic signal so that the resonance signal can be prevented from propagating through a parallel resonance circuit 18. Thus, it is possible to improve ACP, and to facilitate countermeasures to efficiency and high performance.
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