中文摘要：

介绍了一种理论提取耦合模式模型（COM）参量的方法。利用有限长有限法／边界元法（FEM／BEM）计算声表面波同步单端对谐振器的导纳曲线，根据导纳曲线与表面波色散特性相关的特征量，通过解析计算、单变量拟合、再次单变量拟合及两变量拟合4个步骤依次提取出全部COM参量。与传统方法相比，该方法简单、稳定、可靠。根据得到的COM参量对一种混合结构的滤波器进行了模拟，与直接使用FEM／BEM得到的结果符合较好，验证了所提取的COM参量的准确性。

英文摘要：

A theoretical method of getting COM parameters is presented. The admittance curve of a one-port synchronous SAW resonator is calculated using finite FEM/BEM, according to the characteristics of SAW disper- sion, which is used to extract all the COM parameters through four steps.. Algebraic analysis ; Univariate function op- timization;Univariate function optimization once again;Multivariate function optimization. Comparing with tradition- al methods, this approach is convenient, stable and reliable. The simulation of a hybrid SAW filter using the ob- tained COM parameters is consistent with the result directly calculated by FEM/BEM, which verifies the accuracy of COM parameters by our method.