DocumentCode
928092
Title
Fine tuning of surface-acoustic-wave resonator filters with metallisation thickness
Author
Haydl, W.H. ; Cross, P.S.
Author_Institution
Fraunhofer Gesellschaft, Institut fÿr Angewandte Festkörperphysik, Freiburg, West Germany
Volume
11
Issue
12
fYear
1975
Firstpage
252
Lastpage
253
Abstract
Two-port surface-acoustic-wave resonator filters with Q factors in excess of 3000 and a sidelobe suppression of 30 dB have been fabricated from yz LiNbO3 with aluminium metallisation. The dispersion of the centre frequency with aluminium thickness has been found to be 70¿10 kHz/¿m at 35 MHz. The ability to fine tune with metal thickness has been used to compensate inherent substrate inhomogeneities and to fabricate a high-Q factor flat-top filter.
Keywords
Q-factor; acoustic surface wave devices; crystal filters; crystal resonators; metallisation; tuning; 35 MHz; LiNbO3; Q factors; aluminium metallisation; centre frequency; fine tuning; flat top filter; metallisation thickness; sidelobe suppression; substrate inhomogeneities; surface acoustic wave resonator filters;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19750190
Filename
4236707
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