High-frequency switch module

A high-frequency switch module comprising:

• a common terminal;
• a plurality of individual terminals;
• a switch IC that connects one of the plurality of individual terminals through switching to the common terminal through on/off control of a semiconductor switch device such that harmonic signals are output from the common terminal and individual terminals of the switch IC;
• a filter circuit that is connected between a first individual terminal of the plurality of individual terminals and a first external connection terminal to which a high-frequency signal is input from outside and that attenuates a harmonic component of the high-frequency signal;
• and
• a phase adjustment circuit that is connected between the filter circuit and the first individual terminal and that includes an inductor and a capacitor;
• wherein
• in the phase adjustment circuit, values of the inductor and the capacitor are such that an amplitude of a harmonic signal output from the common terminal and an amplitude of a harmonic signal that is output from the first individual terminal and that is reflected at the filter circuit and returns to the first individual terminal cancel each other out.