HIGH-FREQUENCY POWER AMPLIFIER MODULE

摘要

A high-frequency power amplifier module for dual-band mobile radio communication equipment capable of transmitting and receiving first and second frequencies f1 and f2 (f2=2xf1). The output circuit of the module is constituted of a transmission line connected to the drain terminal of an output transistor, a parallel resonnace circuit which is connected in series with the transmission line and resonates with a higher harmonic with a frequency twice as high as the frequency f2, a series resonance circuit which is provided between one end of the parallel resonance circuit and the ground and resonates with a high harmonic with a frequency twice as high as the frequency f1, and an output matching circuit which is connected in series with the other end of the parallel resonance circuit and is matched to the frequencies f1 and f2. The transmission line is preset so that the line my be short-circuited to the drain terminal against even-order higher harmonics having the frequency f2 by a reactance existing at the drain terminal, and the circuit element constant constituting the parallel resonance circuit is preset so that the circuit may be opened at the drain terminal against odd-order higher harmonics having the frequency f1 by reactances existing at the series resonance circuit, transmission line, and drain terminal.