6B-2 Optimal Design of Quasi-Slanted SAW Transducer Employing Resonant SPUDT

Author

Li, Honglang ; He, Shitang ; Omori, Tatuya ; Hashimoto, Ken-Ya ; Yamaguchi, Masatsune

Author_Institution

Inst. of Acoust., Chinese Acad. of Sci., Beijing

fYear

2006

fDate

2-6 Oct. 2006

Firstpage

180

Lastpage

183

Abstract

This paper presents an innovative design technique to achieve a low-loss SAW filter by Quasi-slanted finger interdigital transducers (Q-SFITs). As subfilters, resonant single-phase unidirectional transducers (RSPUDTs) with constant group delay are used. The distances and apertures of subfilters are optimized to realize Q-SFIT filters with low loss, wide bandwidth and small group delay deviation. By this procedure, a Q-SFIT filter is designed and fabricated on a 128deg YX-LiNbO₃ substrate. The experimental results agree with the simulation, and the minimum insertion loss of 5.2 dB and small group delay deviation of 56 ns were simultaneously achieved

Keywords

delays; interdigital transducers; lithium compounds; surface acoustic wave filters; 128deg YX-LiNbO₃ substrate; 5.2 dB; 56 ns; LiNbO₃; Q-SFIT filter; RSPUDT; constant group delay; design technique; group delay deviation; insertion loss; low-loss SAW filter; optimal design; quasi-slanted SAW transducer; quasi-slanted finger interdigital transducers; resonant single-phase unidirectional transducers; subfilters; Acoustic transducers; Band pass filters; Bandwidth; Delay; Frequency; Insertion loss; Passband; Resonance; Surface acoustic waves; Transversal filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2006. IEEE

Conference_Location

Vancouver, BC

ISSN

1051-0117

Print_ISBN

1-4244-0201-8

Electronic_ISBN

1051-0117

Type

conf

DOI

10.1109/ULTSYM.2006.57

Filename

4151913