| 摘要 |
PURPOSE:To execute easily an adjustment without being influenced by an out- band characteristic of an isolator, etc., by providing a transmission line stub whose tip is opened, on at least one of an input matching circuit and an output matching circuit by making it adjacent to a transistor. CONSTITUTION:A transmission line stub 21 and 41 which become a 1/4 wavelength against a frequency of two times of a center frequency of an amplification band, and whose tip is opened are provided on the side being adjacent to a GaAs MOSFET3 of an input matching circuit 2 and an output matching circuit 4, and constituted so as to have a roughly constant impedance, irrespective of an out-band characteristic of an isolator 1 and 5 against the second higher harmonic. Even if a resonance to the second higher harmonic is generated in the isolators 1, 5, no ripple is generated in a frequency characteristic of a fundamental wave.
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