Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849405
