Title :
SPUDT-based filters: design principles and optimization
Author :
Hodé, J.M. ; Desbois, J. ; Difilie, P. ; Solal, M. ; Ventura, P.
Author_Institution :
Thomson Microsonics, Sophia-Antipolis, France
Abstract :
Tremendous work has been done all over the world to overcome the difficult problems of triple transit and insertion loss in SAW filters. Most of research efforts towards low losses have consisted of introducing reflections in the filter designs. Two major classes of low loss filters have emerged during the past 20 years, resonator filters and Single Phase UniDirectional Transducer (SPUDT) filters. This paper reviews the design principles of this second class, including some representative examples of actual devices
Keywords :
losses; optimisation; surface acoustic wave filters; surface acoustic wave transducers; tuning; SAW filters; SPUDT theory; SPUDT-based filters; constrained design problem; insertion loss; low loss filters; multitrack structures; resonant cavities; short-circuit reflection; single phase unidirectional transducer filters; triple transit suppression; weighting functions; Design optimization; Finite impulse response filter; Insertion loss; Reflection; Resonator filters; SAW filters; Surface acoustic waves; Transducers; Transversal filters; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495537
