Title :
Signal flow graph analysis of diffraction and reflection in SAW filters
Author :
Männer, O. ; Wagner, K.C. ; Ruile, W.
Author_Institution :
Siemens AG Austria, Vienna, Austria
Abstract :
A building-block approach for the simultaneous analysis of diffraction, refraction and multiple reflections within multi-transducer surface acoustic wave (SAW) filters is presented. Each reflector or transducer is treated as a `black box´ unit element which is described by the angular spectra of the emitted SAWs and a scattering matrix representing refraction and reflection of the partial waves of the angular-spectrum-of-waves (ASoW) formalism. The unit element parameters are calculated by existing SAW simulators. The interdependence between the forward- and backward-propagating wave profiles within the device is described by a signal flow graph. An analysis of a two-port resonator is presented and compared with measurements. The diffraction loss within the device is accurately predicted
Keywords :
graph theory; surface acoustic wave filters; ultrasonic diffraction; ultrasonic reflection; ultrasonic refraction; ultrasonic transducers; SAW filters; SAW simulators; angular spectra; angular-spectrum-of-waves; backward-propagating wave profiles; building-block approach; diffraction; diffraction loss; forward propagating wave profiles; multi transducer SAW filters; multiple reflections; partial waves; reflection; refraction; scattering matrix; signal flow graph analysis; two-port resonator; unit element parameters; Acoustic diffraction; Acoustic reflection; Acoustic refraction; Acoustic transducers; Acoustic waves; Filters; Flow graphs; Signal analysis; Surface acoustic waves; Surface treatment;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.276050
