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Electronics
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Wireless Power Transfer System: Latest Advances and Prospects
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Wireless Power Transfer System: Latest Advances and Prospects

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Power Electronics".

Deadline for manuscript submissions: closed (15 July 2024) | Viewed by 1518

Special Issue Editor

Prof. Dr. Zhen Zhang

E-Mail Website
Guest Editor
School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Interests: advanced control for power conversion with an emphasis on wireless power transfer and motor drives
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

A revolutionary technology, wireless power transfer (WPT) has seen exponential development and growth due to its outstanding convenience, safety and reliability. In recent years, WPT has been applied in electric vehicles, drones, UAVs, and consumer electronics. However, transfer power, transfer efficiency, and anti-disturbance are the critical concerns of this technology in terms of improving the applicability of WPT systems in harsh environments. In this Special Issue, we welcome researchers to submit high-quality manuscripts covering the latest advances in and significant contributions to WPT systems. Research areas include (but are not limited to) the following topics: the latest innovative work on advanced control methods, compensation networks, coupling structure design, and circuit structure optimization.

Technical Program Committee Member:
Dr. Yu Gu Tianjin University

Prof. Dr. Zhen Zhang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • wireless power transfer
  • control strategy
  • coupling structure
  • compensation network
  • coupling mechanism design
  • new wireless power transfer method

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Published Papers (1 paper)

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Research

30 pages, 10023 KiB  
Article
A Study on a Compact Double Layer Sub-GHz Reflectarray Design Suitable for Wireless Power Transfer
by Romans Kusnins, Darja Cirjulina, Janis Eidaks, Kristaps Gailis, Ruslans Babajans, Anna Litvinenko, Deniss Kolosovs and Dmitrijs Pikulins
Electronics 2024, 13(14), 2754; https://doi.org/10.3390/electronics13142754 - 13 Jul 2024
Viewed by 950
Abstract
The paper presents a novel small-footprint varactor diode-based reconfigurable reflectarray (RRA) design and investigates its power reflection efficiency theoretically and experimentally in a real-life indoor environment. The surface is designed to operate at 865.5 MHz and is intended for simultaneous use with other [...] Read more.
The paper presents a novel small-footprint varactor diode-based reconfigurable reflectarray (RRA) design and investigates its power reflection efficiency theoretically and experimentally in a real-life indoor environment. The surface is designed to operate at 865.5 MHz and is intended for simultaneous use with other wireless power transfer (WPT) efficiency-improving techniques that have been recently reported in the literature. To the best of the authors’ knowledge, no RRA intended to improve the performance of antenna-based WPT systems operating in the sub-GHz range has been designed and studied both theoretically and experimentally so far. The proposed RRA is a two-layer structure. The top layer contains electronically tunable phase shifters for the local phase control of an incoming electromagnetic wave, while the other one is fully covered by metal to reduce the phase shifter size and RRA’s backscattering. Each phase shifter is a pair of diode-loaded 8-shaped metallic patches. Extensive numerical studies are conducted to ascertain a suitable set of RRA unit cell parameters that ensure both adequate phase agility and reflection uniformity for a given varactor parameter. The RRA design parameter finding procedure followed in this paper comprises several steps. First, the phase and amplitude responses of a virtual infinite double periodic RRA are computed using full-wave solver Ansys HFSS. Once the design parameters are found for a given set of physical constraints, the phase curve of the corresponding finite array is retrieved to estimate the side lobe level due to the finiteness of the RRA aperture. Then, a diode reactance combination is found for several different RRA reflection angles, and the corresponding RRA radiation pattern is computed. The numerical results show that the side lobe level and the deviation of the peak reflected power angles from the desired ones are more sensitive to the reflection coefficient magnitude uniformity than to the phase agility. Furthermore, it is found that for scanning angles less than 50°, satisfactory reflection efficiency can be achieved by using the classical reactance profile synthesis approach employing the generalized geometrical optics (GGO) approximation, which is in accord with the findings of other studies. Additionally, for large reflection angles, an alternative synthesis approach relying on the Floquet mode amplitude optimization is utilized to verify the maximum achievable efficiency of the proposed RRA at large angles. A prototype consisting of 36 elements is fabricated and measured to verify the proposed reflectarray design experimentally. The initial diode voltage combination is found by applying the GGO-based phase profile synthesis method to the experimentally obtained phase curve. Then, the voltage combination is optimized in real time based on power measurement. Finally, the radiation pattern of the prototype is acquired using a pair of identical 4-director printed Yagi antennas with a gain of 9.17 dBi and compared with the simulated. The calculated results are consistent with the measured ones. However, some discrepancies attributed to the adverse effects of biasing lines are observed. Full article
(This article belongs to the Special Issue Wireless Power Transfer System: Latest Advances and Prospects)
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