Abstract
The presupposition of COM model is 1-dimensional wave propagation in periodical medium. However, SAW is a kind of 2-dimensional wave, whose vibration along depth direction is not uniform and varies with frequency. Therefore, SAW device does not fit the presupposition of COM model. The error brought by this difference is not significant for Rayleigh wave devices. But for leaky surface wave, especially on 36o-42oYX-LiTaO3, the error between actual curve and simulation by COM model cannot be ignored, because of strong bulk wave radiation into substrate. So, it is necessary to improve the COM model when leaky surface wave devices are simulated. In this paper, the classical form of COM model is still used, but the COM parameters are taken as frequency-dependent variables. We use a new method (virtual phase shift excitation method) to extract the COM parameters as function of frequency. By using the model, a synchronous resonator and a DMS filter are simulated. The calculation by finite element method/boundary element method(FEM/BEM) is taken as reference for comparison. The results are in good agreement in a wide frequency range.
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