FEM -Based Estimation of SAW Power Flow Angle in Periodic Gratings
- Resource Type
- Conference
- Authors
- Zhang, Benfeng; Han, Tao; Li, Xinyi; Huani, Yulin; Omori, Tatsuya; Hashimoto, Ken-Ya
- Source
- 2018 IEEE International Ultrasonics Symposium (IUS) Ultrasonics Symposium (IUS), 2018 IEEE International. :1-9 Oct, 2018
- Subject
- Aerospace
Bioengineering
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Fields, Waves and Electromagnetics
Signal Processing and Analysis
power flow angle
grating structures
thin plate model
complex power flows
- Language
- ISSN
- 1948-5727
This paper proposes a technique to estimate surface acoustic wave (SAW) power flow angle (PFA) in periodic grating structures. First, the thin plate model is extended to take into account non-zero PFA. The relation between the lateral wavenumber and the frequency is derived in an analytical form under the longitudinal resonance condition. Then, the complex power flows in lateral and longitudinal directions are derived and PFA is estimated from the model parameters. Finally, the parameters are extracted by fitting the derived relation between lateral wavenumber and frequency with that calculated by finite element method. The influence of grating electrode on PFA is investigated on quartz and langasite substrates. The results confirm the validity of the technique.