Electromechanical device with acoustic waves comprising a transduction area and an area of free propagation being a resonant structure

摘要

The device has a planar piezoelectric material structure (Mpiezo) comprising a free propagation zone (ZP) of acoustic waves generated at a transduction zone (ZT). Total length of the structure is equal to an integer of half of a wavelength that complies with equation comprising resonance frequency of resonator and average wave propagation speed to adjust a quality coefficient of resonator determined by the length and a coupling coefficient determined by a ratio of transduction length to the total length. The structure is delimited laterally by reflection zones and resonant cavities (F1, F2).