Modeling of Interdigital Transducer Surface Acoustic Wave Device - Design and Simulation

Abstract

Linear network model configuration is used to show the transducer as a chain of identical ports which are acoustically in cascade but electrically in parallel. The admittance, impedance, transfer function and insertion loss of the equivalent circuit network of the surface acoustic wave transducers made of 640 YZ LiNbO3 at a frequency of 400 MHz are studied and analyzed with the help of MATLAB. Design formulation are based on a two dimensional piezoelectric transducers operating at 400 MHz The frequency dependence of Radiation Conductance and Acoustic Susceptance are studied with the help of Impulse Response method. The impulse response method is used for the calculation of transducer input admittance and filter frequency response with much less computational effort than required by earlier approaches. A high quality factor with very low insertion loss is obtained.