Multiplexer, front end circuit, and communication device

A multiplexer, comprising:

• a first acoustic wave filter connected to a common terminal, the first acoustic wave filter including an acoustic wave resonator;
• a second acoustic wave filter connected to the common terminal, the second acoustic wave filter including an acoustic wave resonator;
• and
• an inductor-capacitor (LC) filter connected to the common terminal, the LC filter including one or more inductors and one or more capacitors,
• wherein a passband of the second acoustic wave filter is between a passband of the first acoustic wave filter and a passband of the LC filter,
• a frequency gap between the passband of the second acoustic wave filter and the passband of the LC filter is greater than a frequency gap between the passband of the first acoustic wave filter and the passband of the second acoustic wave filter,
• the passband of the first acoustic wave filter includes one of a transmission band and a reception band of a first communication band,
• the passband of the LC filter includes a transmission band of an unlicensed band when the passband of the first acoustic wave filter includes the reception band of the first communication band, and includes a reception band of the unlicensed band when the passband of the first acoustic wave filter includes the transmission band of the first communication band, the unlicensed band being a band for assisting transfer of a signal in the first communication band, and
• the passband of the second acoustic wave filter includes one of a transmission band or a reception band of a second communication band different from the first communication band.