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Applied Sciences
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Advances in Near-Field Wireless Power Transfer
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Advances in Near-Field Wireless Power Transfer

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: 31 August 2026 | Viewed by 567

Editors

Dr. José Alberto

E-Mail Website
Guest Editor
1. Center of Technology and Systems (UNINOVA-CTS), Caparica, Portugal
2. COPELABS, Lusófona University, 1749-024 Lisboa, Portugal
Interests: wireless power transfer; resonator arrays; inductive charging; linear motors and actuators and induction motors
Special Issues, Collections and Topics in MDPI journals
Dr. Leonardo Sandrolini

E-Mail Website
Guest Editor
Department of Electrical, Electronic, and Information Engineering (DEI), University of Bologna, 40136 Bologna, Italy
Interests: electromagnetic field theory; electromagnetic compatibility; electrical characteristics of renewable energy sources and wireless power transmission based on resonant inductive coupling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Near-field wireless power transfer (NFWPT) systems, particularly those utilizing inductive coupling (IWPT), have been under intensive research in recent years.

IWPT transmits power through magnetic induction between a transmitter and a receiver coil and relies on resonant circuits to improve and optimize the power transfer. The transmitter coil is powered with a high-frequency current (from a few kHz to up to a few MHz), which induces a current in the receiver coil that can be connected to any type of load, including batteries.

IWPT techniques allow the power to be transferred without electrical contact, making it possible to transfer energy in situations where the wired connections are impractical or even impossible. Also, it can transfer power in harsh environments with water, dust or dirt.

This technology presents a wide number of applications that can go from charging electrical vehicles or mobile devices to powering small biomedical devices.

In recent years, significant advances and new applications have highlighted this technology as a promising area for future development. 

Dr. José Alberto
Dr. Leonardo Sandrolini
Guest Editors

Manuscript Submission Information

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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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences 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
  • magnetic resonance
  • resonator arrays
  • inductive power transfer
  • inductive charging
  • near-field power transmission

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Published Papers (1 paper)

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Research

27 pages, 2031 KB  
Article
Closed-Form Transmitter-Side Extraction of Receiver Resonance and Coupling Coefficient in Series–Series Compensated Wireless Power Transfer
by Dain Jung, Seongho Woo and Yujun Shin
Appl. Sci. 2026, 16(12), 5928; https://doi.org/10.3390/app16125928 - 11 Jun 2026
Viewed by 145
Abstract
Series–series (S–S) compensated wireless power-transfer (WPT) systems are increasingly deployed where connector-free and reliable energy delivery is required, but practical monitoring becomes ambiguous when receiver-resonance drift and magnetic-coupling variation produce similar transmitter-side impedance changes. This paper addresses that ambiguity by separating the two [...] Read more.
Series–series (S–S) compensated wireless power-transfer (WPT) systems are increasingly deployed where connector-free and reliable energy delivery is required, but practical monitoring becomes ambiguous when receiver-resonance drift and magnetic-coupling variation produce similar transmitter-side impedance changes. This paper addresses that ambiguity by separating the two effects without receiver-side sensing. During a low-power diagnostic interval, the receiver terminal is briefly placed in open and short states, and only the fundamental phasors of the inverter output voltage and primary current are processed together with the known compensation capacitances. After the open-state measurement identifies the primary self-impedance, the short-state residual is mapped to an affine D–ω2 line; its zero crossing gives the receiver resonant frequency and secondary self-inductance, while its slope gives the mutual inductance and coupling coefficient. The routine is implementable as a start-up or periodic diagnostic function in WPT hardware that already measures the primary voltage and current and can impose the required receiver terminal states; it requires no receiver-side measurement, auxiliary sensing coil, short-loop resistance measurement, or iterative zero-phase search. In simulation, the coupling-coefficient error remained below 0.014% under receiver-inductance tolerance and mutual-inductance variation. In a prototype, the short-state data followed the predicted linear relation with R2=0.9979, and the extracted coupling coefficient agreed with the reference within about 5%. The identified receiver resonance was also used to guide operating-frequency adjustment in a practical power-transfer test. Full article
(This article belongs to the Special Issue Advances in Near-Field Wireless Power Transfer)
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