Analysis of excitation and propagation of acoustic waves under periodic metallic-grating structure for SAW device modeling

Aiming at developing a sophisticated simulation tool for SAW devices, this paper proposes a method of analysing the excitation and propagation of acoustic waves under a periodic metallic-grating structure. It is shown that on periodic metallic-grating electrodes, electric charges and potential are related by the newly defined discrete Green function, which can be evaluated by applying the complex integral theory to the strip impedance proposed by Blotetekjaer et al. (1973). According to the proposed method, parameters required for the impulse response model analysis are readily obtained. As an example, the method was applied to the analysis of a unidirectional transducer demonstrating its practical effectiveness