## Abstract

Piezoelectric Lagrangian equations for the frequency-temperature behavior of quartz is presented. A finite element study of these Lagrangian equations is performed for a two-dimensional periodic SAW structure of quartz. Plane strain assumptions are used to enable a two-dimensional analysis of straight crested acoustic waves in the structure. Adaptive finite element meshes are employed to reduce the size of the finite element problem. The frequency-temperature characteristics of the two fundamental SAW modes are compared and contrasted. Numerical results are compared with experimental data for the ST- and K-cut of quartz. The finite element results for the turnover temperature and the 2nd temperature coefficient of the f-t curve as a function of the electrode height are found to compare well with the ST-cut experimental data. Similar numerical results for the change in frequency-temperature characteristics of the K-cut as a function of crystal cut angles phi is also found to be compare well with the experimental data. The experimental data are found to follow the lower band-gap frequency SAW1.

Original language | English (US) |
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Pages (from-to) | 223-228 |

Number of pages | 6 |

Journal | Proceedings of the IEEE Ultrasonics Symposium |

Volume | 1 |

State | Published - 1998 |

Event | Proceedings of the 1998 International Ultrasonics Symposium - Sendai, Miyagi, Jpn Duration: Oct 5 1998 → Oct 8 1998 |

## All Science Journal Classification (ASJC) codes

- Acoustics and Ultrasonics