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Body-coupled power transmission and energy harvesting

Cited 43 time in Web of Science Cited 60 time in Scopus
Authors

Li, Jiamin; Dong, Yilong; Park, Jeong Hoan; Yoo, Jerald

Issue Date
2021-07
Publisher
NATURE PUBLISHING GROUP
Citation
Nature Electronics, Vol.4 No.7, pp.530-538
Abstract
Wireless power transmission and energy harvesting techniques could be used to power and operate devices in, on and around the human body. However, near-field power transmission approaches are limited by distance, and the efficiency of far-field radiofrequency methods is limited by the body shadowing effect. Here, we show that the body-coupling characteristics of electromagnetic waves-which are either artificially introduced or present in the immediate surroundings-can be used to enable a power transmission and energy harvesting method that offers power to locations all around the body. The body-coupled power transmission exhibits a path loss 30- to 70-dB lower than far-field radiofrequency transmission in the presence of body shadowing. The system can recover 2 mu W at the head from an similar to 1.2-mW transmitter placed 160 cm away at the ankle. In the absence of an active power transmitter, we demonstrate placement-independent scavenging of ambient electromagnetic waves coupled onto the human body, resulting in a power recovery of similar to 2.2 mu W from electromagnetic waves of up to -10-dBm on the body.
ISSN
2520-1131
URI
https://hdl.handle.net/10371/200791
DOI
https://doi.org/10.1038/s41928-021-00592-y
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Yoo, Jerald유담
부교수
  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area Biomedical Applications, Energy-Efficient Integrated Circuits

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