Abstract
In this paper, we provide a tool for predicting the power transfer efficiency of radio-frequency (RF) wireless power transfer (WPT). With its capability of long-range wireless power transfer, RF WPT is considered as a very promising recharging technique for powering low-power internet of things (IoT) devices. The prediction of the power transfer efficiency is a prerequisite for setting up a proper design goal of RF WPT systems. We propose an analytic method that enables to calculate the efficiency in various multi-antenna-to-multi-antenna WPT scenarios with arbitrary positions and attitudes of antenna arrays. We have built a prototype RF WPT system with 64 transmit and 16 receive antennas, the operating frequency of which is 5.8 GHz, and verified the accuracy of the proposed analysis.
Highlights
Radio-frequency (RF) wireless power transfer (WPT) has gained a great momentum [1]
Unlike the inductive or resonant coupling-based near-field WPT, RF WPT is capable of long-range wireless power transfer by the radiation of the electromagnetic (EM) waves
RF WPT is especially suitable for powering up low-power digital devices scattered over a wide area
Summary
Radio-frequency (RF) wireless power transfer (WPT) has gained a great momentum [1]. The multiple-input multiple-output (MIMO) antenna-based analysis and optimization from the perspective of wireless communications have been proposed by a number of papers (e.g., [19], [20]) These works focus on optimizing the transmitting signal and beamforming weights given that the power transfer characteristics are modeled as statistical fading communication channels. The theoretical analysis in the previous works assumes a fictitious continuous aperture, which cannot predict the power transfer efficiency of the real multi-antenna WPT systems. The proposed analysis method can analyze the RF WPT scenario where the transmitter and receiver are freely located in the three-dimensional space with the full consideration of the radiation pattern, polarization, and mutual coupling of antenna elements.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
