SURFACE ACOUSTIC WAVE DEVICE

摘要

PURPOSE: A SAW(Surface Acoustic Wave) device is provided to achieve an impedance conversion function and to decrease the size of the surface acoustic wave device. CONSTITUTION: The surface acoustic wave device comprises an input interdigital transducer(100) and an output interdigital transducer(200), disposed on a surface acoustic wave propagation path of a piezoelectric substrate. The output interdigital transducer(200) has two divided interdigital transducers(201,202) composed of electrode fingers having half the aperture length of electrode fingers in the input interdigital transducer(100). The two divided interdigital transducers(201,202) are serially-coupled and mutually-offset by half a SAW wavelength, such that terminals led from them carry signals 180 degree out of phase.