The coupling-of-modes approach to the analysis of STW devices. II

摘要

For pt. I see ibid., vol. 44, no. 3, p. 652-7 (1997). The methodnfor analyzing surface transverse wave (STW) devices by using ancoupling-of-modes (COM) formalism has been completed, covering the STWnelectromechanical coupling coefficient (ECC). An ECC analytical formulanhas been derived by fitting numerical results from STW effectivenpermittivity analysis. The ECC exhibits frequency and mass-loadingnvariation. Using this new result, a satisfactory agreement withnavailable experimental frequency characteristics of STW two-port quartznresonators has been achieved, without the necessity of additionalnexperimental information. In its present form, the method isnself-consistent and applicable to arbitrary STW layouts