Acoustic wave device suppressing spurious wave in lamb wave and filter including the same

An acoustic wave device for suppressing spurious waves in Lamb waves, the device comprising:

• a support substrate;
• a piezoelectric substrate supported by the support substrate and defining a first resonator region on the support substrate;
• and
• a first resonator and a second resonator disposed in the first resonator region of the piezoelectric substrate, each comprising a plurality of interdigital transducer (IDT) electrodes,
• wherein the support substrate includes a first cavity formed beneath the first resonator and a second cavity formed beneath the second resonator,
• wherein the first cavity and the second cavity are not interconnected within the support substrate, and
• wherein the Lamb waves propagated by the first resonator and the second resonator have different frequency bands, respectively.