Design of SAW filters on langasite

Author

Chvets, V.B. ; Ivanov, P.G. ; Makarov, V.M. ; Orlov, V.S.

Author_Institution

Moscow Res. Radiocommun. Inst., Russia

Volume

1

fYear

1999

fDate

17-20 Oct. 1999

Firstpage

295

Abstract

Due to good temperature stability and moderately high electromechanical coupling coefficient langasite (Li₃Ga₅SiO₄ or LGS) is known as a promising material for SAW devices. The characteristics of the Rayleigh wave propagation on LGS have been studied fairly well. However, no design of SAW devices on LGS suitable for modern communication systems has been reported as yet. In this paper, transversal filters on LGS based on bidirectional interdigital transducers, and low-loss filters on LGS based on natural single phase unidirectional transducers (NSPUDT), are described. The filters on LGS have exhibited better electrical parameters than their analogues on quartz and lithium tantalate.

Keywords

interdigital transducers; lithium compounds; surface acoustic wave filters; Li₃Ga₅SiO₄; NSPUDT; Rayleigh wave propagation; SAW filters; bidirectional interdigital transducers; electromechanical coupling coefficient; langasite; low-loss filters; natural single phase unidirectional transducers; temperature stability; transversal filters; Delay; Lithium compounds; SAW filters; Stability; Substrates; Surface acoustic wave devices; Surface acoustic waves; Temperature; Transducers; Transversal filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE

Conference_Location

Caesars Tahoe, NV

ISSN

1051-0117

Print_ISBN

0-7803-5722-1

Type

conf

DOI

10.1109/ULTSYM.1999.849405

Filename

849405