Modelling of 200 MHz Surface Acoustic Wave (SAW) Delay Line for Sensor Specific Applications

Currently, Surface Acoustic Wave(SAW) devices �nd themselves in many common commercial applications like consumer electronics and telecommunications, where their ability to generate, condition and process radiofrequency (RF) signals is employed to manufacture on a large scale, devices like delay lines, bandpass �lters, resonators, convolvers, radar pulse compression. �lters, sensors, etc. This paper reports on the comparison of three methods of modelling SAW’s. The three models are Impulse Response Model (IRM), Crossed-field Equivalent Circuit Model (ECM) and Coupling of Modes Model (COM). The results were used to calculate the insertion loss and bandwidth of SAW delay line using 50 finger pairs operating at a centre frequency of 200MHz. The modelling study was carried out using MATLAB® as a simulation tool. The results show that the SAW designs based on three models are adequate for sensor applications.