NDLI: SSBW to PSAW conversion in SAW devices using heavy mechanical loading

Content Provider	IEEE Xplore Digital Library
Author	Fusero, Y. Ballandras, S. Desbois, J. Hode, J.M. Ventura, P.
Copyright Year	1986
Abstract	The development of efficient computation tools based on mixed analytical and numerical calculation approaches allows precise descriptions and characterizations of surface acoustic waves (SAW) propagation, taking into account realistic electrical and mechanical boundary conditions. As an example, suppression of the leaky SAW, also called pseudo SAW (PSAW), attenuation has been predicted using such tools allowing to explain experimental occurrences for SAW devices on YX cut lithium niobate and lithium tantalate with thick aluminum strip gratings (6% < h//spl lambda/ < 10%). In this work, such a theoretical model is used to analyze the evolution of surface waves on standard YX lithium tantalate cuts versus aluminum strip height. It is shown that the surface skimming bulk wave (SSBW), which accompanies the pseudo SAW on such crystal orientations, may be trapped by the grating, exhibiting then a second pseudo SAW behavior when close to the Bragg condition. A device has been designed and fabricated to check these theoretical predictions. The experimental evidence of the existence of the phenomenon allows one to discuss its consequences on more classical devices built on (Y + 36/spl deg/, X) LiTaO/sub 3/ substrates.
Starting Page	805
Ending Page	814
Page Count	10
File Size	2122933
File Format	PDF
ISSN	08853010
Volume Number	49
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surface acoustic wave devices Surface acoustic waves Lithium compounds Aluminum Strips Surface waves Acoustic waves Acoustic propagation Boundary conditions Attenuation
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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