Design and Implementation of 5.8GHz RF Wireless PowerTransfer System

TL;DR

This paper introduces a 5.8 GHz RF wireless power transfer system with 64 transmit and 16 receive antennas, featuring a beam scanning algorithm that effectively transfers power over 25 meters, covering near and far-field zones.

Contribution

The paper presents a novel RF WPT system with a beam scanning algorithm capable of efficient power transfer across near and far-field zones, validated by real-world experiments.

Findings

Transferred 3.67 mW at 25 meters distance

Beam scanning effectively covers near and far-field zones

System demonstrates long-range wireless power transfer capabilities

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.