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So far,the diffracted SAW field generated by an IDT withfinite aperture on piezoelectric crystal surfaces is usually analyzedphenomenologically with the angular spectrum theory.A major approxi-mation of this theory is to ignore the vector nature of the field by assum-ing that the wave field can be represented by a scalar as in optics.In thispaper,a rigorous vector field theory of the surface excitation of elastic wavefield in piezoelectric crystal developed by the authors is used to evaluatethe SAW diffraction field adepately and precisely.As an example,numeri-cal results for YZ-LiNbO_3,are presented and compared with thoseobtained form the angular spectrum theory.
So far, the diffracted SAW field generated by an IDT withfinite aperture on piezoelectric crystal surfaces is often analyzedphenomenologically with the angular spectrum theory. A major approxi-mation of this theory is to ignore the vector nature of the field by assum-ing that the wave field can be represented by a scalar as in optics.In this paper, a rigorous vector field theory of the surface excitation of elastic wavefield in piezoelectric crystal developed by the authors is used to evaluate the SAW diffraction field adepately and precisely. As a example, numeri- cal results for YZ-LiNbO_3, are presented and compared with thoseobtained form the angular spectrum theory.