Title :
New closed form two-dimensional COM analysis of SAW filters
Author :
Sveshnikov, B.V. ; Shitvov, A.P.
Author_Institution :
Sci. Production Enterprise Salut, Nizhny Novgorod, Russia
Abstract :
The coupling-of-modes (COM) analysis is generalized to take into consideration the two-dimensional (2D) effects concerned the SAW excitation/detection and propagation/scattering processes. The modeling is applicable to SAW devices in the general case when non-waveguide transducers are weighted in both withdrawal and apodization manners simultaneously with possible slanted overlapping and change of electrodes polarity. Uniform internal reflections and possible radiation directivity of the ITDs (including “natural directionality effect”) is taken into account. Doubly apodized filter having two apodized in-line transducers, including SPUDTs, may be analyzed in the model frame. The quasi-optics approach to the angular spectrum method is applied to describe approximately the diffraction spreading and beam steering in such a system
Keywords :
coupled mode analysis; interdigital transducers; surface acoustic wave filters; ultrasonic diffraction; ultrasonic propagation; ultrasonic scattering; 2D effects; IDT radiation directivity; SAW detection process; SAW excitation process; SAW filters; SAW propagation process; SAW scattering process; SPUDT; angular spectrum method; apodized inline transducers; beam steering; coupling-of-modes analysis; diffraction spreading; doubly apodized filter; electrodes polarity; modeling; nonwaveguide transducers; quasi-optics approach; slanted overlapping electrodes; two-dimensional COM analysis; two-dimensional effects; uniform internal reflections; Acoustic beams; Apertures; Beam steering; Diffraction; Electrodes; Optical reflection; SAW filters; Surface acoustic wave devices; Surface acoustic waves; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.583952
