Resonant Inc.
TRANSVERSELY-EXCITED FILM BULK ACOUSTIC RESONATOR WITH MULTI-PITCH INTERDIGITAL TRANSDUCER

Abstract:

There are disclosed acoustic resonators and methods of fabricating acoustic resonators. An acoustic resonator includes a piezoelectric plate having front and back surfaces, the back surface facing a substrate. A portion of the piezoelectric plate forms a diaphragm spanning a cavity in the substrate. A conductor pattern on the front surface includes a multi-pitch interdigital transducer (IDT) with interleaved fingers of the IDT on the diaphragm.