PMID: 16529115Mar 15, 2006Paper

FEM/BEM impedance and power analysis for measured LGS SH-SAW devices

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Thomas D KennyMauricio Pereira da Cunha

Abstract

Pure shear horizontal piezoelectrically active surface and bulk acoustic waves (SH-SAW and SH-BAW) exist along rotated Y-cuts, Euler angles (0 degrees, theta, 90 degrees), of trigonal class 32 group crystals, which include the LGX family of crystals (langasite, langatate, and langanite). In this paper both SH-SAW and SH-BAW generated by finite-length, interdigital transducers (IDTs) on langasite, Euler angles (0 degrees, 22 degrees, 90 degrees), are simulated using combined finite- and boundary-element methods (FEM/BEM). Aluminum and gold IDT electrodes ranging in thickness from 600 A to 2000 A have been simulated, fabricated, and tested, with both free and metalized surfaces outside the IDT regions considered. Around the device's operating frequency, the percent difference between the calculated IDT impedance magnitude using the FEM/BEM model and the measurements is better than 5% for the different metal layers and thicknesses considered. The proportioning of SH-SAW and SH-BAW power is analyzed as a function of the number of IDT electrodes; type of electrode metal; and relative thickness of the electrode film, h/wavelength, where wavelength is the SH-SAW wavelength. Simulation results show that moderate mechanical loading by g...Continue Reading

References

Sep 26, 2001·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·K Y Hashimoto, M Yamaguchi
Feb 9, 2002·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Kevin J Gamble, Donald C Malocha
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Jan 1, 1994·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·E L Adler

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Citations

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