This paper presents the interference effect of two intersecting waves on a surface acoustic wave(SAW) devices. The
SAW interference device consists of input-output interdigital transducers(IDTs) to transmit and receive a Rayleigh wave
and two interference IDTs to transmit shear-horizontal(SH) waves. The SH-waves intersects perpendicularly and
interferes with the Rayleigh wave at the delay line. We fabricated the SAW devices with center frequencies ranging from
40 MHz to 200 MHz on a 128° YX LiNbO3 wafer. The result of the characteristic test with a network analyzer shows
that the frequency response between the input-output IDTs is shifted by the interference. The center frequency decreases
as the magnitude of the interference wave increases, and the frequency shift is at its maximum when the frequency of the
interference wave coincides with the center frequency of the interference IDTs. The two interference waves applied
simultaneously make the interference effect about twice. Also, interference effect increases with the increase of the
center frequency of the interference IDT. This interference effect of two intersecting SAWs is useful to eliminate the
cross axis sensitivity in designing the SAW gyroscope based on the interference effect.
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