High velocity lamb waves in LiTaO3 thin plate for high frequency filters

Najoua Assila, Michio Kadota, Yuji Ohashi, Shuji Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

First anti-symmetric (Ai) mode Lamb wave propagating in a LiTaO3 thin plate at an Euler angle around (0°, 45°, 0°) has a high velocity. Both phase velocity and electromechanical coupling factor have been evaluated at different propagation angles (0°, 45°, ψ°). A1 mode Lamb wave at (0°, 45°, 0°) offers the highest velocity and largest electromechanical coupling factor, thus proving suitable for high frequency devices. Leaky Lamb waves' velocities have been measured for A0 and zero-th symmetric (S0) modes at different propagation angles by ultrasonic microscopy and are almost similar to the calculated Lamb wave velocities. Whereas Ai mode Lamb wave response has been evaluated at (0°, 42°, 0°), (0°, 42°, 45°) and (0°, 42°, 90°) using a network analyzer. The influence of Al-interdigital transducers' (IDT) thickness on the reflection coefficient has been evaluated for thin (0°, 39°, 0°) LiTaO3. An IDT's thickness larger than 0.03λ (λ is the wavelength) is needed to fabricate A1 mode Lamb wave resonators.

Original languageEnglish
Title of host publication2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509020911
DOIs
Publication statusPublished - 2016 Aug 16
Event70th IEEE International Frequency Control Symposium, IFCS 2016 - New Orleans, United States
Duration: 2016 May 92016 May 12

Publication series

Name2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings

Other

Other70th IEEE International Frequency Control Symposium, IFCS 2016
CountryUnited States
CityNew Orleans
Period16/5/916/5/12

Keywords

  • High Frequency
  • Lamb waves
  • LiTaO
  • Propagation Angle
  • Reflection Coefficient

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Instrumentation

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    Assila, N., Kadota, M., Ohashi, Y., & Tanaka, S. (2016). High velocity lamb waves in LiTaO3 thin plate for high frequency filters. In 2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings [7546796] (2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/FCS.2016.7546796