Patent ID: 10958236

Abstract:
A hybrid acoustic resonator. An interdigital electrode is provided in a first region of a surface of a piezoelectric film facing away from a substrate, and forms an interdigital transducer. At least two trenches are provided in a second region of the surface of the piezoelectric film facing away from the substrate. A bulk-acoustic-wave propagation portion is formed between adjacent trenches. A bulk-acoustic-wave electrode is provided on a side surface of the bulk-acoustic-wave propagation portion, and there is an air gap at a surface of the bulk-acoustic-wave electrode facing away from the bulk-acoustic-wave propagation portion. Thereby, the hybrid acoustic resonator includes both the surface acoustic resonator and the bulk acoustic resonator. An acoustic wave in the bulk-acoustic-wave propagation portion and an acoustic wave in the interdigital transducer are both transmitted along a transversal direction.