Multiplexer

A multiplexer comprising:

• a common connection terminal into which a high-frequency signal is input and from which a high-frequency signal is output;
• a first terminal;
• a second terminal;
• a first filter circuit having a pass band in a first frequency band, the first filter circuit being connected between the common connection terminal and the first terminal;
• a second filter circuit having a pass band in a second frequency band that differs from the first frequency band, the second filter circuit being connected between the common connection terminal and the second terminal;
• and
• a cancel circuit connected between a first node on a first path that connects the common connection terminal and the first terminal to each other or to the first terminal and a second node on a second path that connects the common connection terminal and the second terminal to each other or to the second terminal to cancel out a component in a predetermined frequency band that flows along the first path and the second path;
• wherein
• the cancel circuit includes at least one longitudinally-coupled resonator, and an average pitch between electrode fingers of an interdigital transducer electrode of the at least one longitudinally-coupled resonator is narrower than an average pitch between electrode fingers of an interdigital transducer electrode of a resonator that determines the pass band of the first filter circuit and an average pitch between electrode fingers of an interdigital transducer electrode of a resonator that determines the pass band of the second filter circuit;
• the cancel circuit includes a capacitance element that includes a series arm resonator and is connected in series with the at least one longitudinally-coupled resonator;
• and
• a resonant frequency of the series arm resonator is in the second frequency band.