Analysis and Experiment on Multi-Antenna-to-Multi-Antenna RF Wireless Power Transfer

Park, Je Hyeon; Kim, Dong In; Choi, Kae Won

doi:10.1109/access.2020.3047485

Cited by 16 publications

(17 citation statements)

References 21 publications

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“…There have been several works about the 5.8 GHz RF WPT system demonstration (e.g., [17]- [20]), which has the same target frequency as the proposed system in this paper. In [17], the proposed RF WPT system consists of 4-by-4 transmit antenna elements and 4-by-4 receive antenna elements.…”

Section: Introductionmentioning

confidence: 99%

“…To make RF WPT technology much more reliable for reallife applications, we have to focus on a systematic and integrated view of the overall system. A number of papers provide details of practical implementation of RF WPT together with some associated theories on beamforming and protocol design, such as [7]- [20]. They experimentally verified their own proposed beamforming scheme with a prototype testbed setup.…”

Section: Introductionmentioning

confidence: 99%

“…They experimentally verified their own proposed beamforming scheme with a prototype testbed setup. Especially, the authors of [11]- [20] have built the RF WPT prototype system of their own. The authors of [11] and [12] have fabricated a transmitter module consisting of 64 phased array antennas that operate at around 920 MHz.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the research works on the RF WPT system operating at the frequency from 5 GHz to 6 GHz have gained great momentum (e.g., [13]- [20]). These works introduce their own WPT prototype based on a phased array antenna transmitter with different operation frequencies from 5.2 GHz to 5.8 GHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Design and Implementation of 5.8 GHz RF Wireless Power Transfer System

et al. 2021

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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, with the proposed beam scanning algorithm, the power transfer efficiency reaches 20.32 % and 0.24 % at distances of 0.5 and 5 meters, respectively, whereas the far-field-only-scanning scheme achieved the transfer efficiencies of 13.45 % and 0.23 % at the same receiver positions. Since the proposed transmit antenna array has the maximum linear dimension of 299.12 mm, the approximate boundary between far-field and radiative near-field is 3.45 meters based on the Fraunhofer distance calculation. 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.INDEX TERMS RF wireless power transfer, microwave power transfer, beam scanning, phased array antenna, rectifier.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and Implementation of 5.8 GHz RF Wireless Power Transfer System

et al. 2021

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“…In this case, the active antenna elements were controlled in three different states in order to deliver constant power to the device, considering a scenario where the WPT sensor is moving. In [ 6 ], it was analyzed, that by using a 2D transmitting multi-antenna and a receiver 2D multi-antenna, the RF WPT systems’ efficiency can be increased. The 2D transmitting multi-antenna is composed of 64 elements and the receiver multi-antenna is formed by 16 elements, and simulations and experiments were performed to validate this experiment.…”

Section: Introductionmentioning

confidence: 99%

3D Antenna Characterization for WPT Applications

Jordão

Pires

Belo

et al. 2021

Sensors

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The main goal of this paper is to present a three-dimensional (3D) antenna array to improve the performance of wireless power transmission (WPT) systems, as well as its characterization with over-the-air (OTA) multi-sine techniques. The 3D antenna consists of 15 antenna elements attached to an alternative 3D structure, allowing energy to be transmitted to all azimuth directions at different elevation angles without moving. The OTA multi-sine characterization technique was first utilized to identify issues in antenna arrays. However, in this work, the technique is used to identify which elements of the 3D antenna should operate to transmit the energy in a specific direction. Besides, the 3D antenna design description and its characterization are performed to authenticate its operation. Since 3D antennas are an advantage in WPT applications, the antenna is evaluated in a real WPT scenario to power an RF–DC converter, and experimental results are presented.

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Intelligent wireless power transfer via a 2-bit compact reconfigurable transmissive-metasurface-based router

Li,

Yu,

Qiu

et al. 2024

Nat Commun

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With the rapid development of the Internet of Things, numerous devices have been deployed in complex environments for environmental monitoring and information transmission, which brings new power supply challenges. Wireless power transfer is a promising solution since it enables power delivery without cables, providing well-behaved flexibility for power supplies. Here we propose a compact wireless power transfer framework. The core components of the proposed framework include a plane-wave feeder and a transmissive 2-bit reconfigurable metasurface-based beam generator, which constitute a reconfigurable power router. The combined profile of the feeder and the beam generator is 0.8 wavelengths. In collaboration with a deep-learning-driven environment sensor, the router enables object detection and localization, and intelligent wireless power transfer to power-consuming targets, especially in dynamic multitarget environments. Experiments also show that the router is capable of simultaneous wireless power and information transfer. Due to the merits of low cost and compact size, the proposed framework may boost the commercialization of metasurface-based wireless power transfer routers.

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Analysis and Experiment on Multi-Antenna-to-Multi-Antenna RF Wireless Power Transfer

Cited by 16 publications

References 21 publications

Design and Implementation of 5.8 GHz RF Wireless Power Transfer System

Design and Implementation of 5.8 GHz RF Wireless Power Transfer System

3D Antenna Characterization for WPT Applications

Intelligent wireless power transfer via a 2-bit compact reconfigurable transmissive-metasurface-based router

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