Title :
Plate modes in LiTaO3 for application in wide band resonator filters with improved temperature characteristics
Author :
Naumenko, Natalya F.
Author_Institution :
Nat. Univ. of Sci. & Technol. “MISIS”, Moscow, Russia
Abstract :
Rigorous analysis of plate modes propagating in LiTaO3 plates was performed using the numerical technique SDA-FEM-SDA. The characteristics of zero- and first-order plate modes were calculated in rotated YX cuts of LT as functions of cut angle and plate thickness. Orientations providing high electromechanical coupling (up to 19%), zero TCF at resonance and high velocities (up to 19,000 m/s) were found and investigated. The wave motions following the propagation of some modes are visualized. The possibility of enhancement of some modes by deposition of metal film on the plate bottom surface and the sensitivity of higher-order modes to variation of plate thickness are discussed.
Keywords :
acoustic resonance; acoustic resonator filters; acoustic wave propagation; electromechanical effects; finite element analysis; lithium compounds; LiTaO3; SDA-FEM-SDA; cut angle; electromechanical coupling; first-order plate modes; metal film; numerical technique; plate bottom surface; plate mode propagation; plate thickness; resonance; temperature characteristics; wide band resonator filters; zero-order plate modes; Acoustics; Admittance; Couplings; Dispersion; Electrodes; Gratings; Resonant frequency;
Conference_Titel :
Ultrasonics Symposium (IUS), 2014 IEEE International
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.2014.0117
