Abstract
It has been reported that, through the evanescent near fields, the strongly coupled magnetic resonance is able to achieve an efficient mid-range Wireless Power Transfer (WPT) beyond the characteristic size of the resonator. Recent studies on of the relay effect of the WPT allow more distant and flexible energy transmission. These new developments hold a promise to construct a fully wireless Body Sensor Network (wBSN) using the new mid-range WPT theory. In this paper, a general optimization strategy for a WPT network is presented by analysis and simulation using the coupled mode theory. Based on the results of theoretical and computational study, two types of thin-film resonators are designed and prototyped for the construction of wBSNs. These resonators and associated electronic components can be integrated into a WPT platform to permit wireless power delivery to multiple wearable sensors and medical implants on the surface and within the human body. Our experiments have demonstrated the feasibility of the WPT approach.
Highlights
Wireless Body Sensor Networks have emerged in recent years as a key enabling technology to address a number of significant and persistent challenges in healthcare and medical research, including continuous, noninvasive, and inexpensive monitoring of physiological variables
Based on the results of theoretical and computational study, two types of thin-film resonators are designed and prototyped for the construction of wireless Body Sensor Network (wBSN). These resonators and associated electronic components can be integrated into a Wireless Power Transfer (WPT) platform to permit wireless power delivery to multiple wearable sensors and medical implants on the surface and within the human body
A great demand exists for developing efficient Wireless Power Transfer (WPT) methods to reduce the dependency on batteries and remove both the network of wire connections around the body and the percutaneous wires penetrating the human skin
Summary
Each sensor node, which can be either inside (as an implant) or outside (as a wearable device) the human body, is usually composed of an analog readout front-end, a microprocessor, a radio transmitter/receiver, and a power supply These sensor nodes, wire-connected to a battery, transmit data continuously through a wireless connection to a central node, typically a PDA or a smart cellphone. Wireless electricity is based on strongly coupled magnetic resonance which has sparked widespread interest in both industrial and academic communities [2,3,4,5,6,7,8,9,10,11,12,13,14] It has been reported by the same group of the original paper that the approach of powering multiple devices simultaneously can result in a higher overall WPT efficiency compared to the WPT efficiency to each individual device [8].
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