US 12,294,338 B2
Output matching circuit and power amplifier circuit
Hitoshi Akamine, Kyoto (JP); and Masatoshi Hase, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Dec. 2, 2021, as Appl. No. 17/457,290.
Claims priority of application No. 2020-201703 (JP), filed on Dec. 4, 2020.
Prior Publication US 2022/0182025 A1, Jun. 9, 2022
Int. Cl. H03F 3/191 (2006.01); H03F 1/56 (2006.01); H03F 3/195 (2006.01); H03F 3/24 (2006.01); H04B 1/04 (2006.01)
CPC H03F 3/245 (2013.01) [H03F 1/565 (2013.01); H03F 3/195 (2013.01); H04B 1/0458 (2013.01); H03F 2200/168 (2013.01); H03F 2200/171 (2013.01); H03F 2200/318 (2013.01); H03F 2200/451 (2013.01); H03F 2200/543 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An output matching circuit comprising:
a converter electrically connected to an output end of a power amplifier, the converter being configured to increase an impedance of the output end by magnetic coupling;
a first filter circuit electrically connected between the output end of the power amplifier and the converter, the first filter circuit being configured to provide a short circuit for a first frequency band different than a predetermined transmission frequency band;
a second filter circuit electrically connected between the output end of the power amplifier and the first filter circuit, the second filter circuit being configured to provide a short circuit for a second frequency band different than the predetermined transmission frequency band; and
a transmission line electrically connected between the first filter circuit and the second filter circuit and having a predetermined electrical length.