Title :
Simulation of bulk wave effects in SAW devices using Green´s function and angular spectrum of waves
Author :
Wagner, K.C. ; Visintini, G.
Author_Institution :
Tech. Univ. Vienna, Austria
Abstract :
It is shown that the angular-spectrum-of-waves formalism can be used for the calculation of spurious bulk-wave transmissions in SAW (surface acoustic wave) devices. For each SAW-propagation direction, the bulk-wave contribution to the Green´s function is approximated by a sum of several decaying sinusoidal waves. Applying a least-squares fitting procedure, the a priori unknown amplitudes, phases, and decay constants are determined. These data are used as input for an analysis program based on the extended angular-spectrum-of-waves formalism. Advantages of this approach are correct consideration of angle-dependent coupling and bulk-wave diffraction, compatibility to SAW-device analysis based on angular-spectrum methods, and moderate CPU-time requirements
Keywords :
Green´s function methods; acoustic wave diffraction; acoustic wave propagation; least squares approximations; surface acoustic wave devices; ultrasonic devices; Green´s function; SAW devices; amplitudes; angle-dependent coupling; angular-spectrum-of-waves formalism; bulk wave effects; bulk-wave diffraction; decay constants; extended angular-spectrum-of-waves formalism; least-squares fitting; phases; Acoustic waves; Fourier transforms; Frequency; Green´s function methods; Least squares approximation; Maxwell equations; SAW filters; Surface acoustic wave devices; Surface acoustic waves; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1989. Proceedings., IEEE 1989
Conference_Location :
Montreal, Que.
DOI :
10.1109/ULTSYM.1989.66966
