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

fYear

2014

fDate

3-6 Sept. 2014

Firstpage

471

Lastpage

474

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2014 IEEE International

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.2014.0117

Filename

6931797