Acoustic wave filter, multiplexer, radio frequency front-end circuit, and communication device

An acoustic wave filter comprising:

• a series-arm circuit disposed on a path that connects a first input/output terminal and a second input/output terminal of the acoustic wave filter;
• and
• a parallel-arm circuit connected to a node on the path and a ground,
• wherein at least one of the parallel-arm circuit and the series-arm circuit includes:
• a first acoustic wave resonator;
• and
• a first comb-shaped capacitor connected in parallel or series to the first acoustic wave resonator,
• the first comb-shaped capacitor includes a comb-shaped electrode that includes electrode fingers,
• a frequency at which impedance of the first comb-shaped capacitor has a local maximum value is located outside a passband of the acoustic wave filter, and
• under a condition that a proportion of a width of each of the electrode fingers to a value is defined as an electrode finger duty ratio, the value being a sum of the width and a space between adjacent electrode fingers,
• the comb-shaped electrode has (i) at least two different electrode finger pitches, (ii) at least two different electrode finger duty ratios, or (iii) at least two different electrode finger pitches and at least two different electrode finger duty ratios.