H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/20 (2006.01) H03F 3/189 (2006.01) H03F 3/60 (2006.01)
Patent
CA 2074126
A high-frequency power amplifier comprises a pair of FETs, a divider for supplying to the FETs opposite-phase versions of a signal to be amplified, distributed-parameter transmission lines respectively connected at first ends thereof to output electrodes of the FETs. A combiner combines signals appearing at other ends of the transmission lines into a signal with a common phase. Stubs which short-circuit for even harmonics in the output signals of the FETs are connected to the respective transmission lines at positions distant from the output electrodes of the FETs by a multiple of a quarter wavelength of the fundamental wave. A first capacitor is connected between the transmission lines at positions distant from the output electrodes of the FETs by a 1/12 wavelength of the fundamental wave so that the output electrodes of the FETs are open for the third harmonic. A second capacitor is connected between the transmission lines at positions between the connecting positions of the first capacitor and the connecting positions of the stubs to the transmission lines so as to perform impedance matching for the fundamental wave.
Funaki Haruhiko
Iso Akio
Masuda Nobuo
Ohnishi Masami
Sekine Kenji
Hitachi Ltd.
Kirby Eades Gale Baker
Space Communications Research Corporation
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