Electromechanical coupling to Lamb and shear-horizontal modes in piezoelectric plates
- 1 March 1989
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 36 (2) , 223-230
- https://doi.org/10.1109/58.19155
Abstract
Recent theoretical studies and experiments have been shown that interdigital transducers can couple strongly to plate modes in piezoelectric materials and in piezoelectric-on-nonpiezoelectric composite membranes. The calculated velocity dispersion and electromechanical coupling factors for plate modes in representative piezoelectric materials are described. The frequency dependence of velocity and electromechanical coupling factors are given, under different metallization conditions, for generalized stiffened-Lamb, pure stiffened-Lamb, and stiffened-shear (shear-horizontal) modes, for various plate orientations in lithium niobate, lithium tantalate, quartz, bismuth germanium oxide, and zinc oxide. For lithium niobate, electromechanical-coupling values as high as 15% are found under narrowband bandpass conditions, and 5% under wideband low-pass conditions. For lithium tantalate, bismuth germanium oxide, coupling values of 0.5, 2, and 4% are obtained. For quartz with its weaker piezoelectricity, the coupling is still made smaller.Keywords
This publication has 6 references indexed in Scilit:
- Analysis of lamb wave propagation characteristics in rotated Y‐cut X‐propagation LiNbO3 platesElectronics and Communications in Japan (Part I: Communications), 1986
- Generation and detection of ultrasonic Lamb waves in a thin deposited film by using interdigital transducersApplied Physics Letters, 1983
- Coupling of interdigital transducer to plate modes in a slotted acoustically-thin membraneIEEE Electron Device Letters, 1983
- Propagation and Electromechanical Coupling to Plate Modes in Piezoelectric Composite MembranesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1983
- Electromechanical Coupling Factors for Surface Waves on Selenium and on Selenium Layers on TelluriumPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1979
- Propagation of acoustic surface waves in multilayers: A matrix descriptionApplied Physics Letters, 1973