中文摘要：

以Hashimoto理论分析为基础，波速由栅条导纳的极点确定，给出了波数色散关系的确定方法。以36°YX-LiTaO3算例，得到膜厚为不同值时的波数色散关系，说明其金属短路栅的机械反射和电反射是同相位的，且衰减随膜厚的增大而增大。

英文摘要：

Based on Hashimoto＇s theory, velocity ot SAW is decided by searching poles of strip admittance, The method for analyzing dispersion relation of the SAW wavenumber is given and 36°YX-LiTaO3 is used for numerical example. The dispersion relation of wavenumber are obtained for different electrode thickness. This suggests that the mechanical reflection and electrical reflection for the short-circuited grating are in phase. With an increase in the film thickness, the attenuation increases.