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1. (WO2018036287) POWER AMPLIFIER

Pub. No.:    WO/2018/036287    International Application No.:    PCT/CN2017/092159
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Sat Jul 08 01:59:59 CEST 2017
IPC: H03F 1/02
H03F 1/30
Applicants: ZTE CORPORATION
中兴通讯股份有限公司
Inventors: YU, Minde
余敏德
Title: POWER AMPLIFIER
Abstract:
A power amplifier, comprising two Doherty power amplifier modules and a combiner module. The two Doherty power amplifier modules are separately connected to an input end of the power amplifier, and the combiner module is connected between the output ends of the two Doherty power amplifier modules and the output end of the power amplifier. The combiner module comprises an isolating circuit and two 1/4 wavelength microstrip lines. One 1/4 wavelength microstrip line is connected between the output end of each Doherty power amplifier module and the output end of the power amplifier. The isolating circuit comprises at least two microstrip lines, which are connected in series between the output ends of the two power amplifier modules. An isolating resistor is connected between every two adjacent microstrip lines. The other end of the isolating resistor is grounded. With the combiner module, the power amplifier achieves impedance conversion and power synthesis, and improves the output power. Moreover, the heat dissipation effect is improved because the isolating resistor is grounded.