A surface acoustic wave device includes a piezoelectric substrate, a first
interdigital transducer, a second interdigital transducer and a first
coupler. The first and second interdigital transducers are arranged on the
surface of the piezoelectric substrate such that the second interdigital
transducer is offset from a direction in which a surface acoustic wave
excited by the first IDT propagates. A first edge is provided on the
piezoelectric substrate to reflect the excited surface acoustic wave to
the first and second interdigital transducers, and the first coupler
having a plurality of metal strips on the piezoelectric substrate is
provided between the first edge of the piezoelectric substrate and at
least one of the first and second interdigital transducers so as to be
adjacent to the first and second interdigital transducers. The surface
acoustic wave device operates using a shear horizontal surface wave.
