NDLI: Optimum leaky-SAW cut of LiTaO/sub 3/ for minimised insertion loss devices

Content Provider	IEEE Xplore Digital Library
Author	Hashimoto, K.-Y. Yamaguchi, M. Mineyoshi, S. Kawachi, O. Ueda, M. Endoh, G.
Copyright Year	1997
Description	Author affiliation: Dept. of Electr. & Electron. Eng., Chiba Univ., Japan (Hashimoto, K.-Y.)
Abstract	The paper describes how the propagation loss /spl alpha/ of leaky surface acoustic wave (LSAW) is dependent upon the Al thickness h of grating electrodes and rotation angle /spl theta/ for rotated Y-X LiTaO/sub 3/. Since the energy leak of LSAW originates from the coupling of the slow-shear field component with other components through the surface boundary conditions, zero /spl alpha/ can be realised when the slow-shear component is decoupled. This means that the optimal /spl theta/ giving zero /spl alpha/ should change with h as well as the surface electrical boundary conditions. Since relatively large h of 0.07-0.1 wavelengths is needed for present LSAW devices, the optimal /spl theta/ shifts to 40-42/spl deg/ from the conventional value of 36/spl deg/. Thanks to the minimised propagation loss, experimental results showed that device performances are markedly improved only by increasing /spl theta/ to circa 42/spl deg/ from 36/spl deg/. We also describe the state-of-the-art of the performances obtainable in commercially available LSAW devices based on 42/spl deg/YX-LiTaO/sub 3/.
Starting Page	245
Ending Page	254
File Size	614206
Page Count	10
File Format	PDF
ISBN	0780341538
ISSN	10510117
DOI	10.1109/ULTSYM.1997.663019
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-05
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insertion loss Surface acoustic waves Surface acoustic wave devices Electrodes Propagation losses Gratings Boundary conditions Filters Artificial intelligence Acoustic waves
Content Type	Text
Resource Type	Article

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