High-frequency switch module

摘要

A FET switch (SW10) including a FET allows an antenna input/output port (ANT0) connecting to an antenna to connect to any of a port (RF11) connecting to a transmission signal input terminal (Txl) and ports (RF12 and RF13) respectively connecting to two reception signal output terminals (Rxl and Rx2) by switching between the ports. After a transmission signal is input through the transmission signal input terminal (Tx1) and is then input from the port (RF11) to the FET switch (SW10), harmonic distortion occurs and is output to the transmission signal input terminal (Txl) side. A phase setting element (L1) connecting to the port (RF11) changes an impedance of the input side viewed from the port (RF11) with respect to harmonics from an open state to a short state, so as to disperse the harmonics. Accordingly, harmonics returning to the port (RF11) are suppressed.