Multiplexer

A multiplexer comprising:

• a switch that includes a common terminal, a first selection terminal, a second selection terminal, a third selection terminal, and a fourth selection terminal, and individually connects or disconnects between the common terminal and the first selection terminal, the second selection terminal, the third selection terminal, and the fourth selection terminal;
• a first matching circuit;
• a second matching circuit;
• a first filter;
• a second filter;
• and
• a third filter;
• wherein
• the first filter, the second filter, and the third filter have different pass bands;
• the first selection terminal is connected to one end of the first matching circuit;
• the second selection terminal is connected to one end of the second matching circuit;
• another end of the first matching circuit and another end of the second matching circuit are connected to each other and to one end of the first filter;
• the third selection terminal is connected to one end of the second filter;
• and
• the fourth selection terminal is connected to one end of the third filter.