Effective nonlinear constants for SAW devices from FEM calculations

Mayer, Andreas; Mayer, Elena; Mayer, Markus; Jager, Philipp; Ruile, W.; Bleyl, Ingo; Wagner, K.

doi:10.1109/ultsym.2015.0055

Cited by 9 publications

(10 citation statements)

References 11 publications

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“…14. This confirms previous reasoning that the H2 contribution is significant in the case of low dispersion [8].…”

Section: Direct and Cascaded Nonlinearitiessupporting

confidence: 92%

“…From the overall results of our comparison of the periodic P-matrix simulations with FEM simulations (Fig. 8), using the scaling factors listed in Table II for different η, we are led to the conclusion that the metal electrodes play a dominant role that confirms the results presented earlier [8]. As expected, nonlinear FEM shows that the IMD3 power, calculated with geometric nonlinearity only, is much lower than the total IMD3.…”

Section: B Geometric and Materials Nonlinearitiessupporting

confidence: 82%

“…A simulation model of nonlinear effects in SAW components is required in order to better characterize, model, and minimize the nonlinearities. The generation of IMD3 caused by the nonlinearity of SAW devices has been studied by several authors based on simplified models such as P-matrix [3], [4], coupling of modes [5], [6], or the Mason model [7], and more recently a model based on the finite element method (FEM) [1], [2], [8]. Fig.…”

Section: Investigation On Third-order Intermodulationmentioning

confidence: 99%

“…Using the electroelasticity theory, it was shown that a nonlinear P-matrix simulation model using a single frequencyindependent effective nonlinearity constantĈ(η), which may depend on the metallization ratio (η), can predict the IMD3 of a layered system very well [3], [5], [8]. In [2] and [8], this very same effective nonlinear constant was theoretically evaluated using a FEM approach, where linear fields, associated with input tones, are combined with the nonlinear material tensor data to obtain the sources of nonlinear fields.…”

Section: Investigation On Third-order Intermodulationmentioning

confidence: 99%

“…The SiO 2 layer is assumed to be flat at the top. The nonlinear FEM simulation model is discussed in detail in [2] and [8].…”

Section: Periodic Nonlinear Fem Simulation Modelmentioning

confidence: 99%

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Investigation on Third-Order Intermodulation Distortions Due to Material Nonlinearities in TC-SAW Devices

Chauhan

Mayer²,

Mayer

et al. 2018

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Nonlinearity can give rise to intermodulation distortions in surface acoustic wave (SAW) devices operating at high input power levels. To understand such undesired effects, a finite element method (FEM) simulation model in combination with a perturbation theory is applied to find out the role of different materials and higher order nonlinear tensor data for the nonlinearities in such acoustic devices. At high power, the SAW devices containing metal, piezoelectric substrate, and temperature compensating (TC) layers are subject to complicated geometrical, material, and other nonlinearities. In this paper, third-order nonlinearities in TC-SAW devices are investigated. The materials used are LiNbO-rot128YX as the substrate and copper electrodes covered with a SiO film as the TC layer. An effective nonlinearity constant for a given system is determined by comparison of nonlinear P-matrix simulations to third-order intermodulation measurements of test filters in a first step. By employing these constants from different systems, i.e., different metallization ratios, in nonlinear periodic P-matrix simulations, a direct comparison to nonlinear periodic FEM-simulations yields scaling factors for the materials used. Thus, the contribution of the different materials to the nonlinear behavior of TC-SAW devices is obtained and the role of metal electrodes, substrate, and TC film are discussed in detail.

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“…14. This confirms previous reasoning that the H2 contribution is significant in the case of low dispersion [8].…”

Section: Direct and Cascaded Nonlinearitiessupporting

confidence: 92%

Section: B Geometric and Materials Nonlinearitiessupporting

confidence: 82%