Title :
Transduction magnitude and phase for COM modeling of SAW devices
Author :
Abbott, Benjamin P. ; Hartmann, Clinton S. ; Malocha, Donald C.
Author_Institution :
RF Monolithics Inc., Dallas, TX, USA
Abstract :
An analytic formulation for transduction parameter required by the coupling-of-modes analysis of surface acoustic wave (SAW) transducers is derived by comparing solutions obtained using the coupling-of-modes analysis and an equivalent quasi-static analysis using the Green function method. This analysis results in the derivation of a convenient representation for the transduction strength of periodic SAW transducers. Using the formulation, analytic solutions are obtained for the transduction magnitude and phase of regular SAW transducers. Nonregular transducers are also modeled with the help of an electrostatic field analysis of the transducer´s structure.<>
Keywords :
Green´s function methods; surface acoustic wave devices; ultrasonic transducers; COM modeling; DART structure; Green function method; SAW devices; SPUDT structure; coupling-of-modes analysis; electrostatic field analysis; periodic SAW transducers; quasi-static analysis; transduction magnitude; transduction parameter; transduction phase; transduction strength; Differential equations; Electrodes; Electrostatic analysis; Geometry; Green´s function methods; Mathematical model; Reflection; Surface acoustic wave devices; Surface acoustic waves; Transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
