| 摘 要： | Starting from piezoelectric crystal dynamic equation etc.,both the electric potential and surface chargeinduced by the incident wave are obtained with electrical boundary perturbation technique.The scatteredwaves are then derived including both surface and bulk waves through integral transformation with theinduced charge as exciting source.The scattered surface waves from the grating on YZ-LiNbO_3 are then numerically calculated,and boththe reflective and forward scattering coefficients are given vs.the strip width.Furthermore,the surface wavephase velocity change when passing the grating is derived and numerically calculated too.The theoreticalprediction agrees well with measured results.
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