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

Volume

1

fYear

1997

fDate

5-8 Oct 1997

Firstpage

65

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE

Conference_Location

Toronto, Ont.

ISSN

1051-0117

Print_ISBN

0-7803-4153-8

Type

conf

DOI

10.1109/ULTSYM.1997.662981

Filename

662981