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This paper investigates the transient response of magnetoelectric Surface Acoustic Wave (SAW) sensors using complementary numerical and experimental time-domain analysis. By tracking wave propagation, the study quantifies phase and group velocities and delay times, revealing dispersion inherent to the multilayer Love-wave delay line. The findings demonstrate strong agreement between time-domain measurements and frequency-domain characterization, validating the analytical approach for characterizing SAW sensor dynamics.
Love-wave dispersion in multilayer magnetoelectric SAW sensors is precisely quantified, revealing a consistent discrepancy between phase and group velocities that is accurately predicted by both time-domain wave-field tracking and frequency-domain analysis.
The transient response of surface acoustic wave sensors is important for understanding their dynamic behavior, propagation delay, and response to time-varying signals. In this work, the time-domain propagation characteristics of a magnetoelectric SAW sensor based on a multilayer Love-wave delay line are investigated using complementary numerical and experimental approaches. Time-domain analysis is employed to determine the delay time and to extract the phase and group velocities, while frequency-domain analysis provides an independent characterization of the wave dispersion. Both numerically and experimentally, the phase and group velocities are found to differ, reflecting the dispersion of the Love wave in the multilayer structure. At the operating frequency of 146 MHz, the simulated group velocity obtained from wave-field tracking agrees within 0.4% with the value determined from the frequency-domain dispersion relation. The simulated delay time and group velocity also show good agreement with experiment, with deviations of 2.7% in delay time and 0.9% in group velocity. These results demonstrate the consistency of the time- and frequency-domain analyses and provide a quantitative characterization of the transient propagation behavior of SAW sensors.