A Wideband, Quasi-Isotropic, Kilometer-Range FM Energy Harvester for Perpetual IoT
A Wideband, Quasi-Isotropic, Kilometer-Range FM Energy Harvester for Perpetual IoT
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用于永久物联网的宽带、准各向同性、千米范围 FM 能量采集器
DOI：
10.1109/lmwc.2019.2957653
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发表时间：
2020
影响因子：
3
通讯作者：
Wang‐Sang Lee
中科院分区：
文献类型：
--
作者：
Eui Min Jung;M. Tentzeris;Yepu Cui;Tong;Xuanke He;A. Eid;J. Hester;G. Abowd;Thad Starner;Wang‐Sang Lee
与传统的调谐到单个频率并具有方向性的能量收集器不同，拟议的宽带(23%的分数带宽)全方位系统从附近的所有调频塔进行收集。因此，它不需要每个传感器节点仔细地与任何一个源对准，并且使其适合于诸如精准农业和结构健康监测等大规模部署应用。它在距离调频塔1.54公里的屋顶上收获了高达923美元的文本，同时保持了全方向性，这在一定程度上要归功于所提议的天线，它具有比商业参考宽带天线更宽的带宽和更高的测量增益(2.0 dBI)。它实现了具有竞争力的效率(56%)和灵敏度(−17 dBm)，同时保持了宽带操作，而不是针对个别频率进行专门优化。该系统(由低成本的FR4制造)在室内相同1.54公里的位置收集室外环境中的调频能量，为无线传感器节点供电，而无需定期关闭。
Unlike conventional energy harvesters that are tuned to individual frequencies and are directional, the proposed wideband (23% fractional bandwidth), omnidirectional system harvests from all FM towers in vicinity. Hence, it does not require each sensor node to be carefully aligned to any one source and makes itself suited for mass-deployment applications such as precision agriculture and structural health monitoring. It harvests as much as 923 $\mu \text{W}$ on a rooftop at 1.54 km from an FM tower while retaining omnidirectionality partly thanks to the proposed antenna, which has a wider bandwidth and a higher measured gain (2.0 dBi) than the commercial reference wideband antenna. It achieves competitive efficiency (56%) and sensitivity (−17 dBm) while retaining wideband operation rather than being specifically optimized to individual frequencies. The system (fabricated on low-cost FR4) harvested outside ambient FM energy indoors at the same 1.54-km location to power a wireless sensor node without needing to shut down periodically.