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Prediction of the thermal sensitivity of surface acoustic waves excited under a periodic grating of electrodes

Prediction of the thermal sensitivity of surface acoustic waves excited under a periodic grating of electrodes,10.1109/TUFFC.2005.1509797,IEEE Transac

Prediction of the thermal sensitivity of surface acoustic waves excited under a periodic grating of electrodes   (Citations: 5)
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The prediction of the temperature sensitivity of surface acoustic wave (SAW) devices still requires improvement because the nature of the implemented surface modes and the devices' complexity strongly change from the early basic Rayleigh-wave-based devices. To address this problem, a theoretical analysis and a numerical tool have been developed to predict the thermal dispersion of general electro-acoustic devices. The proposed model accounts for the electrode contribution to the frequency-temperature law. The computed thermal sensitivities are compared to experimental results for different kinds of substrates and waves.
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    • ...This represents a severe limitation of this approach, but reveals reasonable for achieving reliable predictions of the actual SAW Temperature Coefficients of Frequency (TCF) as demonstrated by Pastureaud & al [2]...
    • ...[2], we assume here that the substrate imposes its expansion to any film deposited atop its surface, but these materials do expand in the direction normal to the propagation surface along their own physical properties...
    • ...This assumption is confirmed by experimental observations [5] on thin epitaxial PZT layers and was found efficient in [2] to accurately simulate actual devices...
    • ...It clearly shows that the turnover temperature shifts down with the electrode thickness, which actually corresponds to experimentally observed phenomena and agree well with theoretical results reported in [2]...

    Julien Garciaet al. 2-and-3D Analysis of temperature effects on periodic transducers using...

    • ...The measured TCF are reported in Table III and compared to theoretical predictions obtained using the wellknown Campbell & Jones approach [10] for semi-infinite crystals and transposed to the FEA-BIM model described in [4], neglecting stresses due to thermal differential expansion between the different layers of the devices and accounting for the electrode contribution to the thermal drift [11]...

    L. Le Brizoualet al. GHz frequency ZnO/Si SAW device

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