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

作　　者：Cheng Han Linghui Kong Qingya Li Shan Yu Zhiwei Zhang Jingna Mao 

机构地区：[1]School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China [2]Institute of Automation,Chinese Academy of Sciences,Beijing 100190,China. [3]CAS Center for Excellence in Brain Science and Intelligence Technology,Shanghai 200031,China.

出　　处：《Journal of Beijing Institute of Technology》2022年第1期91-100,共10页北京理工大学学报（英文版）

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 50Ωoutput impedance supplying 5V_(pp)sine voltage at 60 MHz when adopt-ing 1 cm-diameter circular electrodes.

关 键 词：body channel based wireless power transfer(BC-WPT) wrist-to-forehead path chan-nel characteristics minimum path loss limit open-circuit voltage(OCV) 

分 类 号：TM724[电气工程—电力系统及自动化]