Title :
Withdrawal weighted fan-shaped SAW transducers
Author :
Bausk, E.V. ; Yakovkin, I.B.
Author_Institution :
Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk
Abstract :
Withdrawal weighted (WW) fan-shaped interdigital transducers (IDT) are used to design surface acoustic wave (SAW) filters with a good shape factor, flat passband frequency response (FR), and out-of-band rejection of 50 dB and more. Utilization of "stepped" functions as weighting functions for fan-shaped IDTs 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 :
band-pass filters; circuit CAD; frequency response; interdigital transducers; quartz; surface acoustic wave filters; surface acoustic wave transducers; IDT; SAW filters; ST-quartz; SiO2; bandwidth; filter structure synthesis; flat passband frequency response; in-band ripple; out-of-band rejection; personal computer; shape factor; stepped function; surface acoustic wave filter design; withdrawal weighted fan-shaped interdigital transducer; Acoustic transducers; Acoustic waves; Band pass filters; Bandwidth; Frequency response; Microcomputers; Passband; SAW filters; Shape; Surface acoustic waves;
Conference_Titel :
Frequency Control Symposium, 1993. 47th., Proceedings of the 1993 IEEE International
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-0905-7
DOI :
10.1109/FREQ.1993.367458
