Acoustic wave electromechanical device comprising a transduction region and an extended cavity

摘要: An electromechanical device having a resonator using acoustic waves propagating laterally within piezoelectric plane resonant structure and electrodes on face of said structure. The comprises: transduction region length generating waves; free propagation for the waves, adjacent to defined region; being equal an integer number half-wavelengths, resonance frequency equaling average velocity wave divided by wavelength, adjust quality factor fixed coupling coefficient ratio over structure; assembly bounded reflection regions.