Title :
SAW filters with very high shape factor
Author :
Chvets, V.B. ; Ivanov, P.G. ; Makarov, V.M. ; Orlov, V.S.
Author_Institution :
Radiocommun. Res. Inst., Moscow, Russia
Abstract :
Transversal filters with very high shape factor have been developed based on multiharmonic and withdrawal weighted transducers with isolated sections. The developed simulation technique provides excellent results both for in-line filter structures and those with multistrip couplers. The experimental results are presented for IF filters manufactured on YZ-LiNbO3 and ST-quartz substrates. In-line filters exhibit SF in the range 1.15-1.2 and for MSC filters, SF values 1.05-1.1 have been obtained. For all filters the stopband rejection is more than 50 dB
Keywords :
interdigital transducers; lithium compounds; quartz; surface acoustic wave filters; surface acoustic wave transducers; IDT; IF filters; LiNbO3; MSC filters; SAW filters; SF values; ST-quartz; SiO2; YZ-LiNbO3; high shape factor; in-line filter structures; in-line filters; isolated sections; multiharmonic transducers; multistrip couplers; simulation technique; stopband rejection; transversal filters; withdrawal weighted transducer; Algorithm design and analysis; Couplers; Delay effects; Design optimization; Frequency synthesizers; Passband; SAW filters; Shape; Transversal filters; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.662981
