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The nonlinear elastic model for surface acoustic wave (SAW) duplexers we have proposed last year precisely simulates the frequency responses of the in-band 3rd order nonlinear distortion, ‘triple beat’. This result suggests that the main cause of the triple beat is the nonlinear elasticity of SAW. If this hypothesis is correct, the nonlinear SAW displacements should be induced in resonators by the...
We prepared SAW resonators using a SiO2/Cu/ 0°YX-LiNbO3 structure. In this configuration, apodized interdigital transducers (IDTs) are commonly adopted for suppressing series of spurious responses caused by the transverse modes. However, the apodization is shown to deteriorates the normalized Q factor at the anti-resonance frequency and its influence grows when the normalized aperture width is narrow...
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