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Electronics
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Wireless Power Transfer Systems: Design and Implementation
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Wireless Power Transfer Systems: Design and Implementation

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

Deadline for manuscript submissions: 15 April 2026 | Viewed by 4020

Special Issue Editor

Dr. Giacomo Paolini

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Guest Editor
Department of Electrical, Electronic, and Information Engineering (DEI) “G. Marconi”, Alma Mater Studiorum—University of Bologna, 40136 Bologna, Italy
Interests: electromagnetic fields; wireless power transfer; radar; biomedical applications; wearable and implantable electronics

Special Issue Information

Dear Colleagues,

The rapidly developing topic of wireless power transfer (WPT), a technology with significant implications for a wide range of applications, is examined in this Special Issue; its scope encompasses a wide range of topics within WPT, including, but not limited to, resonant inductive coupling, microwave power transmission, capacitive coupling, and magnetic resonance, each treated with their own benefits and drawbacks. It also covers applications in charging infrastructure for electric vehicles, implantable medical devices, and the Internet of Things (IoT). Moreover, this Special Issue will address the technical challenges associated with WPT, such as efficiency optimization, safety standards, regulatory frameworks, and environmental impact. The effectiveness and range of power transfer are important subjects since they are necessary for the real-world application of WPT systems in consumer electronics, electric cars, biomedical equipment, and industrial automation.

Moreover, this Special Issue is also devoted to far-field WPT, exploring advanced techniques for transmitting power over long distances using microwaves or radio frequencies. It covers innovations in antenna design, efficiency improvements, safety considerations, and potential applications in powering remote sensors, IoT devices, and satellites.

Emerging trends, such as the use of metamaterials to enhance power transfer efficiency and the potential for WPT in powering IoT devices and smart grids, are also explored. This Special Issue concludes with an outlook on the future of WPT, emphasizing the need for continued research into overcoming technical challenges, scaling up production, and developing international standards to enable the widespread adoption of wireless power technologies across various sectors. This Special Issue provides a comprehensive overview of the current state of WPT technology, its challenges, and its potential to revolutionize how we think about power distribution and consumption.

Dr. Giacomo Paolini
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 250 words) can be sent to the Editorial Office for assessment.

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 (WPT)
  • resonant coupling
  • far-field wireless power transfer
  • microwave power transfer
  • efficiency optimization
  • dynamic charging
  • metamaterials
  • infrastructure integration
  • energy harvesting
  • wearable and implantable applications

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Published Papers (3 papers)

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Research

18 pages, 6058 KB  
Article
An Efficient Magnetic Coupler with Tight Coupling, Precise Alignment, and Low Leakage Shielding for UAV Wireless Charging
by Yanming Cheng, Shaojie Yu, Xiaodan Zhang, Ruiyang Zhang, Pengfei Liu and Shuairan Yu
Electronics 2025, 14(22), 4358; https://doi.org/10.3390/electronics14224358 - 7 Nov 2025
Viewed by 329
Abstract
In this paper, an efficient magnetic coupler featuring tight coupling and precise alignment is proposed for unmanned aerial vehicle (UAV) wireless charging systems. The design integrates ArUco markers for accurate landing guidance, a position-limiting guide groove to facilitate mechanical alignment, and a dual-coil [...] Read more.
In this paper, an efficient magnetic coupler featuring tight coupling and precise alignment is proposed for unmanned aerial vehicle (UAV) wireless charging systems. The design integrates ArUco markers for accurate landing guidance, a position-limiting guide groove to facilitate mechanical alignment, and a dual-coil tightly coupled configuration to significantly enhance charging efficiency. Specifically, the dual-coil structure is carefully optimized to maximize magnetic coupling and energy transfer performance. Additionally, an improved electromagnetic shielding structure is implemented to reduce electromagnetic leakage and further improve system efficiency. A suitable wireless charging circuit topology is then designed and thoroughly analyzed to match the proposed magnetic coupler, enabling constant-voltage charging operation. The performance of the system is validated through both finite element simulations using ANSYS Maxwell and experimental testing on a prototype setup. Results demonstrate that the integration of ArUco-based visual guidance with the mechanical alignment mechanism achieves a landing deviation of ±12.5 mm without requiring auxiliary positioning components, thereby simplifying system architecture. Under the tightly coupled configuration, the proposed system delivers 78.8 W of charging power to a UAV with a peak efficiency of 95.93%, confirming its effectiveness and high performance. Full article
(This article belongs to the Special Issue Wireless Power Transfer Systems: Design and Implementation)
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20 pages, 1186 KB  
Article
Contactless Battery Solution for Sustainable IoT Devices: Assessment of Environmental Impact
by Jona Cappelle, Lieven De Strycker and Liesbet Van der Perre
Electronics 2025, 14(21), 4140; https://doi.org/10.3390/electronics14214140 - 22 Oct 2025
Viewed by 516
Abstract
When energy harvesting is not feasible or fails to provide sufficient power, the energy buffer of battery-powered Internet of Things (IoT) devices inevitably depletes. The proper disposal and/or replacement of depleted and end-of-life (EoL) batteries is challenging, especially in rural IoT deployments, where [...] Read more.
When energy harvesting is not feasible or fails to provide sufficient power, the energy buffer of battery-powered Internet of Things (IoT) devices inevitably depletes. The proper disposal and/or replacement of depleted and end-of-life (EoL) batteries is challenging, especially in rural IoT deployments, where human intervention is cumbersome. When batteries are left in nature, they can pose a significant environmental risk, leaking harmful chemicals into the soil. This work proposes a novel contactless battery solution for longevity and recyclability, providing automated battery replacement using a short-range wireless power transfer (WPT) link instead of a direct battery-to-IoT node contact-based connection for powering the IoT device. It facilitates battery recovery at EoL by, e.g., an unmanned vehicle (UV), reducing the need for manual intervention. Unlike complex mechanical solutions or contacts prone to corrosion, a contactless approach enables easy replacement and improves reliability and longevity in harsh environments. A technical challenge is the need for an efficient contactless solution to enable the IoT node to get energy from the battery. This work elaborates an efficient wireless connection between the battery and IoT node, which ensures robustness in harsh environments. In addition, it examines the sustainability aspects of this approach. The WPT system is applied in two IoT node applications: polling-based and interrupt-based systems. The proposed solution achieves a transmitter-to-receiver efficiency of 72% and has an additional environmental impact of 2.34 kgCO2eq. However, its key advantage is the ease of battery replacement, which could significantly reduce the expected long-term environmental impact. Full article
(This article belongs to the Special Issue Wireless Power Transfer Systems: Design and Implementation)
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17 pages, 6503 KB  
Article
Wireless Charger for Pacemakers Controlled from Primary Current Without Communication with Secondary Side
by Victor Hueros, Pablo Risquez, Pablo Zumel, Cristina Fernandez and Andrés Barrado
Electronics 2025, 14(8), 1563; https://doi.org/10.3390/electronics14081563 - 12 Apr 2025
Viewed by 2697
Abstract
This paper discusses the implementation of a wireless inductive power transfer system for pacemaker applications. One of the inherent challenges in these systems is regulating the output voltage, as there is no direct physical connection from the primary. Additionally, there are other challenges, [...] Read more.
This paper discusses the implementation of a wireless inductive power transfer system for pacemaker applications. One of the inherent challenges in these systems is regulating the output voltage, as there is no direct physical connection from the primary. Additionally, there are other challenges, such as variability in magnetic coupling. First, resonant converters for inductive charging topologies are investigated for biomedical applications. Then, a control method based on the system’s modeling is proposed, eliminating the need for communication. This method is designed for systems with variable and unknown coupling and specifically for a resonant series–parallel topology. For an operation point, determined by the coupling factor, the primary current is measured to regulate the output voltage by adjusting the input voltage. The relationship between the input current and the input voltage is set by a look-up table. The effectiveness of this control strategy is validated in the PSIM simulator and with experimental results for a coupling range between 0.3 and 0.5, achieving a regulated output current error of less than 1%, and an output voltage range within the limits of the battery charger. Full article
(This article belongs to the Special Issue Wireless Power Transfer Systems: Design and Implementation)
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