The method for analyzing surface transverse wave (STW) devices by using acoupling-of-modes (COM) formalism has been completed in its part coveringthe STW electromechanical coupling coefficient (ECC). An ECC analyticalformula has been derived by fitting numerical results from STW effectivepermittivity analysis. The ECC exhibits frequency and mass-loadingvariation. Using this new result, a satisfactory agreement with availableexperimental frequency characteristics of STW two-port quartz resonators hasbeen achieved, without the necessity of additional experimental information.In its present form, the method is self-consistent and applicable toarbitrary STW layouts.
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