Title :
Discrete apodization in quasi-slanted SAW IDTs
Author :
Bausk, Evgeniy ; Taziev, Rinat ; Lee, Andy
Author_Institution :
Inst. of Semicond. Phys., Russian Acad. of Sci., Novosibirsk, Russia
Abstract :
Opportunities of quasi-slanted transducers (QST) can be extended using a discrete apodization (overlap weighting) of electrodes, which doesn´t enlarge SAW diffraction effect because the breaks of electrodes are placed only in the interconnection regions between acoustic channels, so that each channel is unapodized. An algorithm of optimization of the discrete apodization in QSTs is described here. An improvement of SAW filter selectivity due to the discrete apodization of QSTs is demonstrated.
Keywords :
acoustic imaging; acoustic wave diffraction; interdigital transducers; surface acoustic wave filters; surface acoustic wave transducers; SAW diffraction effect; SAW filter selectivity; acoustic channels; discrete apodization; interconnection regions; quasislanted SAW IDT; quasislanted transducers; Acoustic diffraction; Acoustic transducers; Apertures; Bandwidth; Electrodes; Frequency response; Passband; Physics; SAW filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293252
