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High-frequency power amplifier

  • US 5,274,341 A
  • Filed: 07/17/1992
  • Issued: 12/28/1993
  • Est. Priority Date: 07/19/1991
  • Status: Expired due to Fees
First Claim
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1. A high-frequency power amplifier comprising:

  • a pair of amplifying devices;

    a divider which supplies opposite-phase versions of a signal to be amplified to said amplifying devices;

    transmission lines connected respectively at one ends thereof to output electrodes of said amplifying devices;

    stubs connected respectively to said transmission lines at positions distant from the output electrodes of said amplifying devices by a multiple of a quarter wavelength of a fundamental wave included in output signals of said amplifying devices, and adapted to shortcircuit for a frequency twice the frequency of the fundamental wave included in the output signals of said amplifying devices;

    a capacitor connected between said transmission lines, said capacitor providing a load impedance matching to said pair of amplifying devices for the fundamental wave included in the output signals of said amplifying devices; and

    a combiner which combines signals appearing at another ends of said transmission lines into a signal of a common phase.

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