Multiplexer

A multiplexer comprising:

• a common terminal;
• and
• a plurality of filters connected to the common terminal, each of the plurality of filters including a plurality of resonators;
• wherein
• the plurality of filters include:
• a first transmission filter having a first pass band;
• a second transmission filter having a second pass band different from the first pass band;
• a center frequency of the first pass band is higher than a center frequency of the second pass band;
• in a case where an electric equivalent circuit of a specific resonator among the plurality of resonators in each of the plurality of filters is represented by using a parallel circuit including a series circuit of an equivalent resistance, an equivalent inductor, and an equivalent capacitance, and a damping capacitance, and a current flowing in the series circuit is defined as an acoustic path current;
• under conditions that a phase of an acoustic path current of the first transmission filter at a side of the common terminal at a frequency within the first pass band is represented as θ1Tx1, a phase of an acoustic path current of the first transmission filter at the side of the common terminal at a frequency within the second pass band is represented as θ2Tx1, a phase of an acoustic path current of the second transmission filter at the side of the common terminal at a frequency within the first pass band is represented as θ1Tx2, and a phase of an acoustic path current of the second transmission filter at the side of the common terminal at a frequency within the second pass band is represented as θ2Tx2;
• the multiplexer satisfies a first condition or a second condition;
• the first condition is a condition that
• |(2·θ1Tx1−θ2Tx1)−(2·θ1Tx2−θ2Tx2)|=180°±90°, and
• the second condition is a condition that
• |(2·θ2Tx1−θ1Tx1)−(2·θ2Tx2−θ1Tx2)|=180°±90°.