Abstract
This paper reports a wideband ultrasonic energy harvester using 1–3 piezoelectric composites with non-uniform thickness. The harvester can be regarded as composed of parallel-connected oscillator arrays with a gradually varying thickness. The operating bandwidth of the harvester is broadened by the overlapping frequency spectra of the oscillator arrays. The design, modeling, and performance of the harvester are presented. The impedance and the output voltage are analyzed and validated by the experiments. Compared with the harvester with the uniform thickness, the one with the gradually varying thickness can scavenge the ultrasonic energy in a wider range of frequencies. The operating bandwidth of the harvester strongly depends on its thickness variation.
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