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A three-port acoustic lattice model for piezoelectric transducers containing opposing zones of polarization

Ramadas, S.N. and Hayward, G. and O'Leary, R.L. and McCunnie, T.F. and Mulholland, A. and Troge, A. and Pethrick, R.A. and Robertson, D. and Murray, V. (2007) A three-port acoustic lattice model for piezoelectric transducers containing opposing zones of polarization. In: 2007 IEEE International Ultrasonics Symposium, 2007-10-28 - 2007-10-31.

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Inversion Layer Transducers (ILT) have attracted considerable interest in the recent past, due to the wide bandwidth and even harmonic sensitivity. This paper presents a new three-port lattice model for ILT devices. Based on linear systems theory, a discrete bi-directional lattice is used to describe the mechanical wave propagation and continuous transfer function to represent the electrical parameter. The mathematical formulation for an ILT configuration, and a straightforward physical interpretation of the lattice model is presented. A selection of experimental and simulation results are included to demonstrate the feasibility of the technique