Engineering and Technology Journal

Comparative Study of Three SAW Configurations for Temperature Sensing

Document Type : Research Paper

Authors

1 Centre de Développement des Technologies Avancées

2 Centre de Développement des Technologies Avancées, CDTA

Abstract

This paper demonstrates three SAW configurations' electrical and mechanical behaviors: a one-port resonator, a two-port resonator, and a delay line that works as temperature sensors of around 440 MHz characteristic frequencies. We investigate the sensitivity of the sensors for temperatures up to 200 °C. A linear behavior of the frequency shift versus temperature is observed; the resulting sensitivity of the sensors is evaluated at 22.74 ppm/°C for the one-port resonator, 23.17 for the two-port resonator, and 3.83 ns/°C for the delay line structure. The electromechanical coupling coefficient (k2) is 0.492 % for the delay line, 0.489 % for the one-port resonator, and 0.55% for the two-port resonator. The quality factor QFactor calculated from Y11 electrical input admittance is 2858 for the one-port resonator, 2977 for the delay line, and 2903 for the two-port resonator. The optimized piezoelectric layer thickness value, for the one port resonator, is hAlN=1.5µm.

Graphical Abstract

Highlights

 

  •  Study of three types of Surface Acoustic Wave (SAW) temperature sensors by FEM simulations.
  •   A theoretical model is developed for temperature change detection when the sensors are subjected to temperature variation.
  •   The developed model is associated with FEM models used to design a one-port and a two-port SAW resonator added to a delay line sensor.
  • A stack of three layers forms the sensors: Si, AlN, and Al.  

Keywords

Main Subjects

References
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Engineering and Technology Journal
Volume 41, Issue 8
Electrical Engineering
7 articles
August 2023
Page 1068-1081
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