Acoustic wave filter and multiplexer

An acoustic wave filter comprising:

• a first input-output terminal and a second input-output terminal;
• one or more series arm resonators provided in a path connecting the first input-output terminal and the second input-output terminal;
• and
• one or more parallel arm resonators each provided between a node in the path and ground;
• wherein
• each of the one or more series arm resonators and the one or more parallel arm resonators includes an acoustic wave resonator including a substrate exhibiting piezoelectricity and an interdigital transducer (IDT) electrode on the substrate;
• the substrate includes:
• a piezoelectric film with one surface including the IDT electrode;
• and
• a high acoustic velocity support substrate, an acoustic velocity of a bulk wave propagating in the high acoustic velocity support substrate being higher than an acoustic velocity of an acoustic wave propagating along the piezoelectric film;
• the IDT electrode includes a pair of comb-shaped electrodes each including a plurality of electrode fingers that extend in a direction crossing an acoustic wave propagation direction and that are arranged in parallel to each other, and a busbar electrode that connects one-side ends of electrode fingers of the plurality of electrode fingers to each other;
• and
• when a floating withdrawal electrode is defined as an electrode finger that is not coupled to either busbar electrode of the pair of comb-shaped electrodes among the plurality of electrode fingers and, in a portion of the IDT electrode in which the plurality of electrode fingers of each of the pair of comb-shaped electrodes face each other in the acoustic wave propagation direction, a polarity-inverting withdrawal electrode is defined as an electrode finger that is coupled to the same busbar electrode as directly adjacent electrode fingers on both sides with respect to the electrode finger among the plurality of electrode fingers:
• at least one of the one or more series arm resonators includes the IDT electrode including the polarity-inverting withdrawal electrode;
• and
• at least one of the one or more parallel arm resonators includes the IDT electrode including the floating withdrawal electrode.