Abstract
In this paper, we present a 5.8 GHz radio-frequency (RF) wireless power transfer (WPT) system that consists of 64 transmit antennas and 16 receive antennas. Unlike the inductive or resonant coupling-based near-field WPT, RF WPT has a great advantage in powering low-power internet of things (IoT) devices with its capability of long-range wireless power transfer. We also propose a beam scanning algorithm that can effectively transfer the power no matter whether the receiver is located in the radiative near-field zone or far-field zone. The proposed beam scanning algorithm is verified with a real-life WPT testbed implemented by ourselves. By experiments, we confirm that the implemented 5.8 GHz RF WPT system is able to transfer 3.67 mW at a distance of 25 meters with the proposed beam scanning algorithm. Moreover, the results show that the proposed algorithm can effectively cover radiative near-field region differently from the conventional scanning schemes which are designed under the assumption of the far-field WPT.
Highlights
T HE Internet of Things (IoT) has been regarded as a representative technology of the industrial revolution in terms of hyper-connected society
To describe the location of the receive antenna, including its attitude, we introduce the receiver’s local coordinate system (LCS), which is represented by three orthogonal axes δx, δy, and δz
EXPERIMENTAL RESULTS we present the experimental results that we have conducted to verify the performance of the proposed wireless power transfer (WPT) system
Summary
T HE Internet of Things (IoT) has been regarded as a representative technology of the industrial revolution in terms of hyper-connected society. With the upcoming industrial wave, supplying electrical power to a tremendous number of IoT devices will become a great challenge. Conventional ways to supply power to devices (e.g., connecting power cords or periodically replacing batteries) are a huge loss in various aspects for the costs and efforts and for the quality of service when it comes to large-scale IoT connectivity. There have been various approaches for wirelessly charging electrical devices. Near-field wireless power transfer (WPT) based on resonant or inductive coupling methods has shown great technical progress and even introduced commercialized products which are able to charge mobile devices [1]. Despite the capability of highefficiency power transfer of near-field WPT, the application area is very restricted due to the short charging range. The wire is not connected to the target device directly, it still demands the devices be located near the power source, even on a specific spot
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