NDLI: Determination of SAW velocity shift and reflection coefficients for SPUDT structures

Content Provider	IEEE Xplore Digital Library
Author	Hahn, Y. Thoma, C. Bhattacharjee, K. Henderson, D. Garber, E.
Copyright Year	1994
Abstract	Design of SPUDT type SAW devices requires accurate values or velocity shifts and reflection coefficients associated with asymmetric finger overlays in each unit cell. Until now, these parameters have been deduced experimentally since accurate theoretical models are not available. Previous work has been limited to symmetric and periodic structures. We report extension of the model to analyses of EWC and DART. The first-order reflection coefficients $r_{1}$ and velocity shift $s_{1}$ are computed for several standard SAW materials and cuts. The sensitivity of r and s to variations in the finger geometry is determined for the SPUDT structure. Comparison between theoretical and experimental results for 34°-quartz and 112° $LiTaO_{3}$ are presented. The second order effects of evanescent and bulk waves of higher harmonics coupled to the fundamental components are expected to be important for thicker fingers
Starting Page	233
Ending Page	236
File Size	327793
Page Count	4
File Format	PDF
ISBN	0780320123
DOI	10.1109/ULTSYM.1994.401585
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-10-31
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic velocity measurement Acoustic reflection Surface acoustic wave transducers Quartz materials/devices Lithium materials/devices
Content Type	Text
Resource Type	Article

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