Abstract: An object of the present invention is to provide an acoustic wave device utilizing acoustic wave reflection phase change, which converts an electrical signal into an acoustic wave of a piezoelectric material using a piezoelectric effect of the piezoelectric material and converts the converted acoustic wave back into an electrical signal, wherein the acoustic wave device can effectively reduce a spurious response on a frequency response and suppress the occurrence of ripples in a passband by adjusting electrode periods of an interdigital transducer and a reflector to control a phase change of reflection of the acoustic wave, thereby canceling multiple reflections.

Abstract: The acoustic wave device having an acoustic wave phase dispersion structure according to the present invention converts an electrical signal into an acoustic wave of a piezoelectric material using a piezoelectric effect of the piezoelectric material and converts the converted acoustic wave back into an electrical signal, and has an effect of effectively reducing a spurious response on a frequency response and reducing a ripple in a passband by dispersing a phase of the acoustic wave reflected to an IDT electrode.