NDLI: Optimum cut of LiTaO/sub 3/ for high performance leaky surface acoustic wave filters

Content Provider	IEEE Xplore Digital Library
Author	Kawachi, O. Endoh, G. Ueda, M. Ikata, O. Hashimoto, E. Yamaguchi, M.
Copyright Year	1996
Description	Author affiliation: Fujitsu Labs. Ltd., Kawasaki, Japan (Kawachi, O.)
Abstract	The paper describes how leaky surface acoustic wave (LSAW) propagation characteristics on LiTaO/sub 3/ depend upon its rotation angle when the Al electrode thickness is increased. It is shown that the propagation loss arising from the leaky nature changes parabolically with both the film thickness and rotation angle, and becomes zero when they are properly chosen. This means that even when relatively thick electrodes are needed, zero propagation loss is always achieved by properly determining the rotation angle for LiTO/sub 3/. When the electrode thickness is 0.07/spl sim/0.1 wavelengths, for example, LSAWs on the 40/spl sim/42/spl deg/ Y-X LiTaO/sub 3/ offer zero propagation loss without deteriorating other characteristics. Ladder filters for 800 MHz range were fabricated, which essentially need thick Al electrodes. As is predicted by theoretical calculation, experimental results showed that if the rotation angle a is increased to circa 42/spl deg/ from the conventional value of 36/spl deg/, the insertion loss and shape factor are improved by 0.7 dB and 0.26, respectively. The result gives a valuable guideline for determining the optimal rotation angle of LiTaO/sub 3/ to be used for high performance LSAW filters, which are one of the key components in RF sections of mobile communication systems.
Starting Page	71
Ending Page	76
File Size	272481
Page Count	6
File Format	PDF
ISBN	0780336151
ISSN	10510117
DOI	10.1109/ULTSYM.1996.583796
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-11-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrodes Propagation losses Filters Surface acoustic waves Acoustic waves Acoustic propagation Insertion loss Shape Guidelines Radio frequency
Content Type	Text
Resource Type	Article

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