TY - JOUR
T1 - Modeling and electrode design optimizations of plano-plano langasite crystal resonator
AU - Shah, Mohammad Ismaeel
AU - Kariyawasam, Kavindu
AU - Ramakrishnan, Narayanan
AU - Saha, Tridib
N1 - Funding Information:
Manuscript received March 19, 2019; accepted June 4, 2019. Date of publication June 7, 2019; date of current version August 26, 2019. This work was supported in part by the School of Engineering Internal Seed Grant 2018, Monash University Malaysia and in part by Ministry of Higher Education, Malaysia Fundamental Research Grant Scheme FRGS/1/2017STG02/MUSM/02/5. (Corresponding author: Tridib Saha.) The authors are with the Electrical and Computer Systems Engineering Department, School of Engineering, Monash University Malaysia, Subang Jaya 47500, Malaysia (e-mail: ismaeelsh15. . ail. com; kami930810. . ail.com; ramakrishnan. . onash.edu; tridib.saha. . monash.edu). Digital Object Identifier 10.1109/TUFFC.2019.2921719
Publisher Copyright:
© 1986-2012 IEEE.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/9
Y1 - 2019/9
N2 - The 3-D finite-element model (FEM) of a Y-cut plano-plano langasite crystal thickness shear mode (TSM) resonator is presented, and Mindlin's theory is used to investigate the optimal electrode shapes and sizes for langasite crystal resonator. Circular and elliptical electrodes of various arc lengths are studied to identify the most optimal electrode design configuration in order to achieve TSM vibration free from any anharmonic modes. Simulation results show that resonators with elliptical electrodes have noticeably better suppression of spurious modes compared to that of circular electrodes. Moreover, spurious mode suppression is accomplished for multiple electrode sizes for the same shape, which greatly differs from Mindlin's theory. Hence, three optimized designs are shortlisted and their mass loading sensitivities are investigated. Circular and elliptical electrodes of the same area show similar responses to added mass, indicating that elliptical electrodes have no apparent advantage over circular electrode in mass sensing applications.
AB - The 3-D finite-element model (FEM) of a Y-cut plano-plano langasite crystal thickness shear mode (TSM) resonator is presented, and Mindlin's theory is used to investigate the optimal electrode shapes and sizes for langasite crystal resonator. Circular and elliptical electrodes of various arc lengths are studied to identify the most optimal electrode design configuration in order to achieve TSM vibration free from any anharmonic modes. Simulation results show that resonators with elliptical electrodes have noticeably better suppression of spurious modes compared to that of circular electrodes. Moreover, spurious mode suppression is accomplished for multiple electrode sizes for the same shape, which greatly differs from Mindlin's theory. Hence, three optimized designs are shortlisted and their mass loading sensitivities are investigated. Circular and elliptical electrodes of the same area show similar responses to added mass, indicating that elliptical electrodes have no apparent advantage over circular electrode in mass sensing applications.
KW - Electrode design
KW - finite-element analysis
KW - langasite crystal
KW - spurious modes
UR - http://www.scopus.com/inward/record.url?scp=85071785869&partnerID=8YFLogxK
U2 - 10.1109/TUFFC.2019.2921719
DO - 10.1109/TUFFC.2019.2921719
M3 - Article
C2 - 31180848
AN - SCOPUS:85071785869
SN - 0885-3010
VL - 66
SP - 1521
EP - 1528
JO - IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
IS - 9
ER -