II. SUPPLIMENTARY NOTES wr

Unlimited This do.ument has been approved for public release and sale; its distribution is unlimited. 13. ABSTRACT (Mxilmum 200worws) The aim of this project was to obtain a more complete understanding of the physical phenomena occung in piezoelectric transducers, with the aim of obtaining optimal designs and improved manufacturability. Of key importance in design are conversion efficiency, bandwidth, and control of spurious modes. The transducer structures considered are 1:3, 0:3, 2:2, and 1:3:1. Contributions to the advancement of 1:3 modeling and fabrication are: (i) finite element modeling of composite lattices with complex unit cells, (ii) transmission line and reciprocity modeling of distributed period composites, (ii) fabrication of test transducers for verification of the modeling principles. New modeling theory for 0:3 composites aims at replacing the empirical "cubes " model with a model consisting of nearly close-packed spherical particles. This approach estimates more closely the performance of 0:3 composites and points the way for further studies. The 2:2 structures considered are, in fact, multilayered electroded transducers with a single piezoelectric material. But multipl