Multiplexer, high-frequency front-end circuit, and communication device

A multiplexer comprising:

• a common terminal, a first terminal, and a second terminal;
• a first filter provided on a first path electrically connecting the common terminal and the first terminal, the first filter including a plurality of acoustic wave resonators;
• and
• a second filter provided on a second path electrically connecting the common terminal and the second terminal, the second filter having a pass band that is higher in frequency than the first filter;
• wherein
• the plurality of acoustic wave resonators include:
• two or more series resonators provided on the first path;
• and
• one or more parallel resonators each provided on a path electrically connecting a first node on the first path and ground,
• a first series resonator that is closest to the common terminal among the two or more series resonators is electrically connected to the common terminal without the one or more parallel resonators therebetween;
• each of the plurality of acoustic wave resonators includes an interdigital transducer (IDT) electrode defined by a pair of comb-shaped electrodes provided on a substrate having piezoelectricity;
• each of the pair of comb-shaped electrodes of each of the plurality of acoustic wave resonators includes:
• a plurality of electrode fingers that extend in a direction perpendicular or substantially perpendicular to an acoustic wave propagation direction;
• and
• a busbar electrode that connects first ends of the plurality of electrode fingers to each other;
• an imaginary line obtained by connecting second ends of the plurality of electrode fingers included in one comb-shaped electrode among the pair of comb-shaped electrodes intersects a reference line that is a straight line extending in the acoustic wave propagation direction;
• and
• when an angle defined by the reference line and the imaginary line of the first series resonator is represented by a first slant angle, an angle defined by the reference line and the imaginary line of a first parallel resonator that is closest to the common terminal among the one or more parallel resonators is represented by a second slant angle, and an angle defined by the reference line and the imaginary line of the rest of the plurality of acoustic wave resonators is represented by a third slant angle, at least one of the first slant angle and the second slant angle is larger than the third slant angle.