Matching circuit and dual-band power amplifier

摘要

There is provided a matching circuit (10), in which a main-matching block (101) and a sub-matching block (102) are connected in series. The sub-matching block includes: a series matching block (110) of which one end is connected to the main-matching block; and a parallel matching network (170) connected to the other end of the series matching block. At a first frequency f1, the connection point of the series matching block and a first parallel matching block (111) is caused to be in an open state for a radio-frequency signal, and the connection point of the first parallel matching block and the second parallel matching block (112) is caused to be in a short state for the radio-frequency signal. Impedance matching is performed by the main-matching block and the series matching block at the first frequency f1, and is performed by the main-matching block and the sub-matching block at the second frequency f2.