Calculation of COM parameters for an arbitrary IDT cell

Abstract

In this paper a fast and accurate method to calculate COM parameters (transduction and reflectivity) of a transducer cell with any arbitrary geometry and polarity sequence is presented. This method was applied to optimization of SPUDT cells on different materials. SPUDT structures with three and four electrodes per wavelength have been optimized for several different substrates. Very good agreement between predicted and experimental results is shown for SPUDT transducers on quartz, langasite and lithium tantalate.