Patent attributes
A FET switch enables an antenna input/output port connected to an antenna to connect to any of a port connected to a transmission signal input terminal and ports respectively connected to two reception signal output terminals by switching between the ports. After a transmission signal is input through the transmission signal input terminal and is then input from the port to the FET switch, harmonic distortion occurs and is output to the transmission signal input terminal side. A phase setting element connected to the port changes an impedance of the input side viewed from the port with respect to harmonics from an open state to a short-circuited state, so as to disperse the harmonics. Accordingly, harmonics returning to the port are greatly suppressed and minimized.
