Title :
Withdrawal weighted fan-shaped SAW transducers
Author :
Bausk, Evgeniy V. ; Yakovkin, Igor B.
Author_Institution :
Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk, Russia
fDate :
3/1/1995 12:00:00 AM
Abstract :
Withdrawal weighted (WW) fan-shaped interdigital transducers (FIDT) are used to design surface acoustic wave (SAW) filters with a good shape factor, a flat passband, and an out-of-band rejection of 50 dB and more. Utilization of "stepped" actions as a weighting action for FIDT\´s ensures a simple filter structure synthesis procedure that does not take a long time on a personal computer. Three modifications of SAW filters with 2% bandwidth, in-band ripple of 0.1 dB, and out-of-band rejection of 50-55 dB have been fabricated on ST-quartz.<>
Keywords :
frequency response; interdigital transducers; network synthesis; surface acoustic wave filters; surface acoustic wave transducers; SAW filter design; ST-quartz; SiO/sub 2/; fan-shaped interdigital transducers; filter structure synthesis; flat passband; frequency response; in-band ripple; out-of-band rejection; personal computer calculation; shape factor; stepped actions; withdrawal weighted fan-shaped SAW transducers; Acoustic transducers; Acoustic waves; Band pass filters; Bandwidth; Electrodes; Frequency response; SAW filters; Strips; Surface acoustic waves; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
