Sensors, Volume 25, Issue 23
2025 December-1 - 302 articles
Cover Story: Wireless sensors are vital for condition monitoring but rely on unsustainable batteries. While vibration energy harvesting offers a promising alternative, current harvesters often neglect high-frequency energy, which is weak but contains abundant information and is further attenuated by destructive interference from multiple sources. To address these limitations, this paper proposes a symmetrical gradient metamaterial beam (SGMB) integrated with multiple piezoelectric patches to enhance multi-band high-frequency energy harvesting and suppress dual-source destructive interference. Simulation and experimental results demonstrate that the SGMB provides multiple enhanced bands within 1000 Hz–3500 Hz and improves the energy harvesting efficiency by over 100 times, representing a breakthrough for self-powered and self-sensing wireless sensors. View this paper - Issues are regarded as officially published after their release is announced to the table of contents alert mailing list .
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