Acoustic wave device, filter, and composite filter device

A filter, comprising:

• a plurality of acoustic wave devices defined by acoustic wave resonators;
• wherein
• in the plurality of acoustic wave devices, at least one acoustic wave device includes a piezoelectric substrate and an interdigital transducer electrode provided on or above the piezoelectric substrate;
• the interdigital transducer electrode includes a plurality of first electrode fingers and a plurality of second electrode fingers, the plurality of second electrode fingers being connected to an electric potential different from an electric potential of the plurality of first electrode fingers;
• a direction orthogonal or substantially orthogonal to a direction in which the first electrode fingers and the second electrode fingers extend is an acoustic wave propagation direction;
• and
• the interdigital transducer electrode includes a first area centrally provided in the acoustic wave propagation direction, second areas provided on one side and another side of the first area in the acoustic wave propagation direction, and third areas each provided on a side of each of the second areas opposite to the first area in the acoustic wave propagation direction;
• in the second areas, the first electrode fingers and the second electrode fingers are alternately arranged in the acoustic wave propagation direction;
• and
• in the first area and the third areas, adjacent electrode fingers in the acoustic wave propagation direction are connected to a same electric potential or electrode fingers are not connected to any electric potential.