The Wireless Power Transmission on the Wrist-to-Forehead Path Based on the Body Channel

• 作者: Cheng Han Linghui Kong Qingya Li Shan Yu Zhiwei Zhang Jingna Mao
• 来源期刊: 北京理工大学学报（英文版）
• 年，卷（期）: 2022,（1）
• 页码范围: 91-100
• 页数: 10页
• 语种: 英文
• DOI: 10.15918/j.jbit1004-0579.2021.084

摘要

The body channel based wireless power transfer (BC-WPT) method utilizes the human body as the medium to transfer power for bioelectronics, which can achieve a lower transmission loss due to its higher conductivity. However, except for the channel length, different on-body loca-tions of the transmitter and receiver also influence the power supply performance. This paper fo-cuses on the wrist-to-forehead path to show the potential of BC-WPT for the brain bioelectronics such as the brain computer interface device. The channel characteristics from 10 MHz to 60 MHz are measured by a vector network analyzer (VNA) and a prototype BC-WPT system with differ-ent copper electrodes and the lowest power loss locates between –22 dB and –33 dB. Furthermore, the minimum path loss limit is simulated in Advanced Design System (ADS) software and the low-est optimum path loss can reach nearly –13 dB. Finally, a rectifier circuit is also built at the receiv-er side to harvest d.c. voltage. The results show that the open-circuit voltage (OCV) can reach 1.75 V with the transmitter of 50 Ω output impedance supplying 5Vpp sine voltage at 60 MHz when adopt-ing 1 cm-diameter circular electrodes.