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1

Heo, Jun, Sungyeal Park, Sang-Won Kim, In-Kui Cho, Songnam Hong, and Yong Bae Park. "Control of WPT Transmitter Coils for Power Distribution to Two Receiver Coils without Feedback." Energies 14, no. 20 (2021): 6828. http://dx.doi.org/10.3390/en14206828.

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This paper proposes the algorithm to control the current ratio of the transmitting (Tx) coils for proper power distribution to the two receiving (Rx) coils in wireless power transfer (WPT) system. The proposed algorithm assumes that each Rx coil appears at different times to consider the situation where multiple users request power transmission as practically as possible. That is, suppose the second Rx coil enters the charging space later than the first Rx coil. When each coil enters the charging space, only the Tx coil is used to obtain the value required for calculation. Using the obtained r
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2

Oh, Myeong-Jun, Patrick Danuor, and Young-Bae Jung. "A Study on the Optimal Magnetic Beam Forming of Coil Arrays for Long Distance Wireless Power Transmission." Sensors 23, no. 11 (2023): 5312. http://dx.doi.org/10.3390/s23115312.

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Multiple-input multiple-output (MIMO) wireless power transfer (WPT) technology which employs multiple transmitter (TX) coils to simultaneously couple power to the receiver (RX) coil has proved to be an effective technique to enhance power transfer efficiency (PTE). Conventional MIMO-WPT systems rely on the phase-calculation method based on the phased-array beam steering concept to constructively combine the magnetic fields induced by the multiple TX coils at the RX coil. However, increasing the number and distance of the TX coils in an attempt to enhance the PTE tends to deteriorate the receiv
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3

Liu, Dong, Jin Yang, Yuntao Yue, Ruofan Li, and Xinwei Song. "A Quasi-Uniform Magnetic Coupling Array for a Multiload Wireless Power Transfer System with Flexible Configuration Strategies." Electronics 14, no. 3 (2025): 463. https://doi.org/10.3390/electronics14030463.

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The coupling problem between the transmitter coils (Tx) and receiving coils (Rx) is influenced by the transmission power and efficiency for a multiload wireless power transfer (WPT) system. In order to solve this problem, a novel array WPT system with quasi-uniform coupling (QC) is proposed in this paper. Owing to the comprehensive design of the Tx and its mutual positional relationship, the proposed system supports simultaneous activation of multiple and even adjacent Tx while maintaining QC. In addition, the structure of Tx is simple and can be obtained with a low-cost optimization procedure
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4

Lu, Ziyang, Yubin Zhao, and Dunge Liu. "Adaptive Impedance Matching Scheme for Magnetic MIMO Wireless Power Transfer System." Electronics 10, no. 22 (2021): 2788. http://dx.doi.org/10.3390/electronics10222788.

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In coupled magnetic resonance (CMR) wireless energy transfer systems, the energy transfer power is low and the power transfer efficiency changes with the coil position. One reason for this reduction in power and efficiency is the impedance mismatching (IM) between the Tx and Rx coils; achieving impedance matching for multiple-input multiple-output (MIMO) CMR IM wireless power transmission (WPT) is quite complex due to the uncertainty in the number of coils and the interaction between coils. In this paper, we provide an analytical model of MIMO CMR which fully formulates the complex relationshi
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5

Liu, Suqi, Xueying Yan, Guiqiang Xu, Gang Wang, and Yuping Liu. "An Eight-Coil Wireless Power Transfer Method for Improving the Coupling Tolerance Based on Uniform Magnetic Field." Processes 12, no. 10 (2024): 2109. http://dx.doi.org/10.3390/pr12102109.

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In wireless power transfers (WPTs), it is challenging to obtain a constant output of power (COP) and constant transmission efficiency (CTE) in large coupling variation ranges. In this study, the eight-coil WPT system achieves a uniform magnetic field (UMF) in the transmitter and receiver sides using two transmitting (Tx) coils and two receiving (Rx) coils, respectively. COP and CTE are then achieved with large coupling variation ranges. The circuit model and equations of the transmission characteristics are first obtained based on the structure and working principle of the Helmholtz coil. The
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6

Hwang, Min-Wook, Young-Min Kwon, and Kwang-Cheol Ko. "Optimal Design of Relay Coil Inductance to Improve Transmission Efficiency of Four-Coil Magnetic Resonance Wireless Power Transmission Systems." Electronics 13, no. 7 (2024): 1261. http://dx.doi.org/10.3390/electronics13071261.

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Magnetic resonance wireless power transmission consists of a source coil and relay coil (transmission coil (Tx-coil), receiving coil (Rx-coil)). The relay coil is designed with windings and a series capacitor, which are resonant with the input voltage frequency. Magnetic resonant wireless power transmission by a relay coil enables the transmission of power from a few centimeters to several meters. Recently, research has been conducted on the shape and material of each coil to increase the transmission distance. However, limitations remain with respect to increasing the transmission distance. S
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7

Wen, Haibing, Jiayuan Li, Kehan Zhang, et al. "Enhancing Power Transmission Stability of AUV’s Wireless Power Transfer System with Compact Planar Magnetic Coupler." Journal of Marine Science and Engineering 11, no. 3 (2023): 566. http://dx.doi.org/10.3390/jmse11030566.

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In this paper, a wireless power transfer (WPT) system with a compact planar magnetic coupler for an autonomous underwater vehicle (AUV) is proposed. A passive induction (PI) coil is integrated into the circular transmitter (Tx) coil to build a uniform magnetic field (UMF), which can guarantee the stable output of the WPT system under uncertain radial and axial misalignments for AUV. Based on normalized magnetic induction intensity distribution analysis, a UMF constructing method with a PI coil is given, aiming to eliminate the fluctuation of magnetic field intensity, and the PI coil design pri
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8

Lee, Sangyong, Jeonho Lee, Jongkyum Kwon, and Se-Kyo Chung. "An Improved Estimation Method of Mutual Inductance Angle for a Two-Dimensional Wireless Power Transfer System." Symmetry 13, no. 3 (2021): 448. http://dx.doi.org/10.3390/sym13030448.

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The improvement of power transmission efficiency (PTE) is an important issue in the design of a wireless power transfer (WPT) system. The WPT system with multiple transmitting (Tx) or receiving (Rx) coils is a way to improve the PTE. This paper deals with the estimation of the mutual inductance angle for a two-dimensional (2D) WPT system with two Tx coils and one Rx coil. The mutual inductance angle is one of the most important parameters to determine the PTE in the 2D WPT system. The condition for the maximum PTE is investigated and the mutual inductance angle is defined for the 2D WPT system
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9

Sato, Shunta, and Sousuke Nakamura. "Proposal of Wireless Charging Which Enables Magnetic Field Suppression at Foreign Object Location." Energies 15, no. 3 (2022): 1028. http://dx.doi.org/10.3390/en15031028.

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In the wireless power transmission (WPT) to electric vehicles (EVs) in parking lots, there is a risk of abnormal heat generation due to the absorption of the magnetic field in metallic foreign objects. Accordingly, currently available products are equipped with a function that automatically halts power transmission when a metallic foreign object is detected. However, if possible, continuing power transmission while suppressing the magnetic field absorption may be an another solution. Therefore, this paper proposes a novel function which enables wireless power transmission with high efficiency
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10

Kwon, Hyeokjin, Kang-Ho Lee, and Byunghun Lee. "Inductive Power Transmission for Wearable Textile Heater using Series-None Topology." Electronics 9, no. 3 (2020): 431. http://dx.doi.org/10.3390/electronics9030431.

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In this paper, an inductive-power-transmission (IPT) system for a wearable textile heater is proposed to comfortably provide heating to a user’s body. The conductive thread, which has high electrical resistance, was sewn into a receiver (Rx) coil on clothing to generate high temperature with a low current. The proposed wearable heaters are completely washable thanks to their nonmetallic materials, other than conductive threads in the clothing. We introduced series-none (SN) topology to eliminate a resonant capacitor in the wearable textile heater. A single resonant capacitor in a transmitter (
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11

Pahlavan, Saeideh, Mostafa Shooshtari, and Shahin Jafarabadi Ashtiani. "Star-Shaped Coils in the Transmitter Array for Receiver Rotation Tolerance in Free-Moving Wireless Power Transfer Applications." Energies 15, no. 22 (2022): 8643. http://dx.doi.org/10.3390/en15228643.

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Wireless power is one of the new promising technologies for IoT applications. The use of arrays for power transfer to free-moving objects has revolutionized wireless power transmission (WPT) applications. Herein, we present an extendable platform for transmitting power to a moving object receiving power from an array. The transmitter (TX) consists of two overlapping layers of square planar coils rotated 45 degrees to each other to provide the best electromagnetic flux coverage. Each layer consists of four coils to further control the power supply to the small receiver (RX) coil. This overlappi
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12

Rotundo, Sabrina, Valeria Lazzoni, Alessandro Dellabate, Danilo Brizi, and Agostino Monorchio. "Dual-Tuned Magnetic Metasurface for Field Enhancement in 1H and 23Na 1.5 T MRI." Applied Sciences 15, no. 11 (2025): 5958. https://doi.org/10.3390/app15115958.

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In this paper, we present a novel passive dual-tuned magnetic metasurface, which can enhance the field distribution produced by a closely placed radio-frequency coil for both 1H and 23Na 1.5 T MRI imaging. In particular, the proposed solution comprises a 5 × 5 capacitively loaded array, in which each unit-cell is composed of two concentric spiral coils. Specifically, the unit-cell internal spiral coil operates at the proton Larmor frequency (64 MHz), whereas the external is at the sodium one (17 MHz). Therefore, the paper aims to demonstrate the possibility of enhancing the magnetic field dist
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13

Lee, Byunghun, and Yaoyao Jia. "Wirelessly-Powered Cage Designs for Supporting Long-Term Experiments on Small Freely Behaving Animals in a Large Experimental Arena." Electronics 9, no. 12 (2020): 1999. http://dx.doi.org/10.3390/electronics9121999.

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In modern implantable medical devices (IMDs), wireless power transmission (WPT) between inside and outside of the animal body is essential to power the IMD. Unlike conventional WPT, which transmits the wireless power only between fixed Tx and Rx coils, the wirelessly-powered cage system can wirelessly power the IMD implanted in a small animal subject while the animal freely moves inside the cage during the experiment. A few wirelessly-powered cage systems have been developed to either directly power the IMD or recharge batteries during the experiment. Since these systems adapted different powe
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14

Altoobaji, Isa, Ahmad Hassan, Mohamed Ali, Morteza Nabavi, Yves Audet, and Ahmed Lakhssassi. "A Fully Integrated 0.6 Gbps Data Communication System for Inductive-Based Digital Isolator with 0.8 ns Propagation Delay and 10−15 BER." Electronics 12, no. 15 (2023): 3336. http://dx.doi.org/10.3390/electronics12153336.

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Digital isolators are implemented to protect low-voltage electronics and ensure human safety during high-voltage surge events. In this work, we present the design of an inductive-based digital isolation system that can sustain up to 1 kVrms breakdown voltage. The proposed system is designed using the pulse polarity modulation scheme and fabricated in a 0.35 μm CMOS. Two identical dies are bounded within the IC package, with one die housing the transmitter (Tx) and the isolation transformer, while the other die contains the receiver (Rx). Two different customized designs between three metal lay
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15

TUDORACHE, Tiberiu, and Andrei MARINESCU. "CALCULUL CÂMPULUI ELECTRIC ASOCIAT UNUI CUPLOR INDUCTIV DESTINAT TRANSFERULUI DE PUTERE WIRELESS." "ACTUALITĂŢI ŞI PERSPECTIVE ÎN DOMENIUL MAŞINILOR ELECTRICE (ELECTRIC MACHINES, MATERIALS AND DRIVES - PRESENT AND TRENDS)" 2020, no. 1 (2021): 1–7. http://dx.doi.org/10.36801/apme.2020.1.17.

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"Contactless or wireless power transmission has become a widespread disruptive technology. Although known for more than 100 years, it is the result of the unprecedented development of microelectronics and power electronics in recent decades. Numerous technical solutions for near-field energy transmission at different power and frequency levels are currently established: capacitive electric field transmission (CPT), inductive magnetic field transmission (IPT), multi-coil transmission and simultaneous transmission via electric field and magnetic field as a combination of the first two. The mater
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16

D., Karthikeyan, Koley Sayon, Bagchi Mayukh, Bhattacharya Avijit, and Vijayakumar K. "Wireless charging scheme for medium power range application systems." International Journal of Power Electronics and Drive System (IJPEDS) 11, no. 4 (2020): 1979–86. https://doi.org/10.11591/ijpeds.v11.i4.pp1979-1986.

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Wireless power transmission (WPT) has attracted a wide variety of subjects in various disciplines and has also become a highly active research field due to its capacity to facilitate charging systems. Wireless power transmission will be compulsory to use soon as this technology enables electrical energy to be transmitted from a power source to an electrical load over an air gap without connecting wires. Wireless power transmission has been developed in the low power (1W to 10W) and high power (100W-500W) region. While the low power region development focuses on powering medical transplants and
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17

Xun, Jian-Hui, Yajie Mu, Kunyi Zhang, Haixia Liu, and Long Li. "The Efficiency Improvement of Multiple Receivers in Wireless Power Transmission by Integrating Metasurfaces." Materials 15, no. 19 (2022): 6943. http://dx.doi.org/10.3390/ma15196943.

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In this paper, we propose the use of metasurfaces to enhance evanescent wave coupling to improve the wireless power transfer (WPT) efficiency of multiple receivers. A 4 × 4 negative permeability metasurface is designed and placed between the transmitter (Tx) and receiver (Rx) coils for the greatest improvement in transfer efficiency. Through the analysis of the number and position topologies of Rx coils, the efficiency can be greatly improved; the maximum efficiency at longer transmission distances is achieved through the 4 × 4 negative permeability metasurface in the multiple−receiver system.
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18

Mahdi, Ali Jafer, Shah Fahad, and Wenhu Tang. "An Adaptive Current Limiting Controller for a Wireless Power Transmission System Energized by a PV Generator." Electronics 9, no. 10 (2020): 1648. http://dx.doi.org/10.3390/electronics9101648.

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The use of a wireless power transmission system (WPTS) in modern applications, such as consumer electronics, renewable energy sources (RESs) and electric vehicles (EVs), can significantly increase the safety and convenience of the power supply. However, low efficiency is a major hurdle to the use of a WPTS in these applications. In this article, an adaptive virtual impedance controller (AVIC) is presented to enhance the wireless power transfer (WPT) efficiency of a photovoltaic generator (PVG) to the load. In the proposed controller, a unique method is employed to adaptively estimate the coeff
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19

Yusri, Muhammad Sukriyllah, Mohamad Harris Misran, Maizatul Alice Meor Said, et al. "Transfer Efficiency Enhancement using Double Negative Metamaterial in Wireless Power Transfer System." International Journal of Electrical and Electronics Research 13, no. 1 (2025): 30–36. https://doi.org/10.37391/ijeer.130105.

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Recently, there have been a lot of inventions and development in the field of wireless power transfer (WPT), which has increased the need for WPT systems with high power transfer efficiency (PTE) and longer transmission distances for end users. However, several of the presently accessible WPT systems exhibit restricted PTE and transmission range as a result of their utilization of inductive coupling. In addition, the PTE experiences a significant decline as the separation between the transmitter and receiver coils grows while employing this methodology. Hence, this study presents a proposal fo
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20

Khanmohamed, A.-Jay Alkarim, Sébastien Néron, Aaron Gabriel Nunez Avila, Daniel Chartrand, James D. Wuest, and Dominic Rochefort. "Tetrasubstituted Diphenoquinones As Organic Cathode Materials in Aqueous Batteries - Embarking on X-Ray Diffraction Studies in Operando." ECS Meeting Abstracts MA2025-01, no. 62 (2025): 3033. https://doi.org/10.1149/ma2025-01623033mtgabs.

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Electroactive organic molecules (EOMs) are being investigated as active materials for batteries. Due to the wide range of available structures and the possibility to tailor them to the desired properties, EOMs can compete with current materials in terms of potential and gravimetric energy density. Additional benefits are expected if these materials can be readily obtained from the biomass with minimal transformations. These promises prompted us to revisit diphenoquinones (DPQs) and their electrochemistry (J. Org. Chem. 2022, 87, 7673-7695), Of the various derivatives studied, tetra-halo substi
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21

Yoon, Seoyeon, Taejun Lim, and Yongshik Lee. "Multifunctional coil technique for alignment-agnostic and Rx coil size-insensitive efficiency enhancement for wireless power transfer applications." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-023-50094-4.

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AbstractThis paper presents a multifunctional coil technique to enhance the transfer efficiency of an inductively-coupled wireless power transfer (WPT) system, regardless of the alignment condition and size ratio between the transmitter (Tx) and receiver (Rx) coils. The technique incorporates an auxiliary coil on the Tx side, where current is induced through coupling from the primary coil. Since the Tx coil consists of two coils, transmission to the Rx occurs through the coil with the higher coupling coefficient, determined by the misalignment state. Additionally, by controlling this current u
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22

Tian, Zijian, Bochao Guo, Wei Chen, Ni Guo, and Ting Yu. "C2DD—An omnidirectional receiver based on single‐coil transmitter." International Journal of Circuit Theory and Applications, September 18, 2023. http://dx.doi.org/10.1002/cta.3782.

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AbstractIn this paper, the omnidirectional receiver (Rx) of wireless power transfer (WPT) system is proposed, making any transmitter (Tx) into omnidirectional Tx. The omnidirectional Rx is composed of the quadrature double‐D (DD) coils and circular coil in series (C2DD). The C2DD Rx can utilize the toroidal magnetic field (TMF) and the linear magnetic field (LMF). The paper presents the circuit diagram model of WPT system. Based on the analysis of circuit model, the smooth mutual inductance of system is responsible for stable transmission performance during C2DD Rx movement. The result of nume
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23

Kiani, Mehdi, Fei Zhang, Yong Kwon Ki, et al. "Evaluation of a Closed Loop Inductive Power Transmission System on an Awake Behaving Animal Subject." August 1, 2011. https://doi.org/10.1109/iembs.2011.6091887.

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This paper presents in vivo experimental results for a closed loop wireless power transmission system to implantable devices on an awake behaving animal subject. In this system, wireless power transmission takes place across an inductive link, controlled by a commercial off-the-shelf (COTS) radio frequency identification (RFID) transceiver (TRF7960) operating at 13.56 MHz. Induced voltage on the implantable secondary coil is rectified, digitized by a 10-bit analog to digital converter, and transmitted back to the primary via back telemetry. Transmitter (Tx) and receiver (Rx) circuitry were mou
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24

Fan, Xingming, Haonan Zhang, and Xin Zhang. "Analysis of transmission performance on wireless power transfer system with metamaterial." International Journal of Microwave and Wireless Technologies, May 23, 2023, 1–9. http://dx.doi.org/10.1017/s1759078723000582.

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Abstract In order to solve the problems of low power transfer efficiency (PTE) and limited distance in magnetic coupling resonant wireless power transfer (MCR-WPT) technology. In this paper, based on the magnetic field control ability of metamaterials (MMs), the way to improve the performance of MCR-WPT systems is studied. First, the influence of MMs on the coupling of MCR-WPT system is theoretically analyzed by establishing an equivalent circuit model. Through a series of simulations and experiments, the relationships between the PTE and the array and placement of the MM slab are investigated
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25

Wallstein, Niklas, Roland Müller, André Pampel, and Harald E. Möller. "Radiation damping at clinical field strength: Characterization and compensation in quantitative measurements." Magnetic Resonance in Medicine, November 27, 2023. http://dx.doi.org/10.1002/mrm.29934.

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AbstractPurposeIn any MR experiment, the bulk magnetization acts on itself, caused by the induced current in the RF receiver circuit that generates an oscillating damping field. This effect, known as “radiation damping” (RD), is usually weak and, therefore, unconsidered in MRI, but can affect quantitative studies performed with dedicated coils that provide a high SNR. The current work examined RD in a setup for investigations of small tissue specimens including a quantitative characterization of the spin‐coil system.Theory and MethodsA custom‐made Helmholtz coil (radius and spacing 16 mm) was
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26

Pham, Thanh Son, Thao Duy Nguyen, and Dinh Lam Vu. "Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications." Communications in Physics 32, no. 1 (2021). http://dx.doi.org/10.15625/0868-3166/16049.

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In this article, we investigate a compact metamaterial structure for enhancing a magnetic resonant wireless power transfer (WPT) system operated at 6.5 MHz. A thin magnetic metamaterial (MM) slab placed between the transmitter (Tx) and receiver (Rx) coil can improve WPT efficiency. The metamaterial unit cell is designed by a ten-turn spiral resonator (10T-SR) loaded with an external capacitor. The resonant frequency of MM unit cells can be easily controlled by changing the capacitor value. By using the optimization approach, we achieve a significant WPT efficiency improvement at a mid-range di
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27

Karimi, Mohammad Javad, Menghe Jin, Yuxuan Zhou, Catherine Dehollain, and Alexandre Schmid. "Wirelessly Powered and Bi-directional Data Communication System with Adaptive Conversion Chain for Multisite Biomedical Implants Over Single Inductive Link." IEEE Transactions on Biomedical Circuits and Systems, January 29, 2024. https://doi.org/10.1109/TBCAS.2024.3359772.

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<strong>Abstract</strong> A wirelessly powered and data communication system is presented which is implemented as a full system, designed for multisite implanted biomedical applications. The system is capable of receiving wireless power and data communication for each implant separately, using inductive links with different resonance frequencies. To achieve this, dual-band coils are presented in the system. In addition, the system provides bi-directional data communication, utilizing amplitude and load shift keying (ASK and LSK) modulation schemes over a single inductive link. The system emplo
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28

Yusri, Muhammad Sukriyllah, Mohamad Harris Misran, Tan Kim Geok, et al. "Advanced Perspectives on Metamaterial Integration in Wireless Power Transfer: A Review." Applied Computational Electromagnetics Society Journal (ACES), March 30, 2025. https://doi.org/10.13052/2024.aces.j.400308.

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The field of wireless power transfer (WPT) has recently seen much innovation and improvement and, as a result, there is an ever-increasing need for high power transfer efficiency (PTE) of the WPT systems, as well as enhanced transmission distance for end users. However, some of the currently available WPT systems have a restricted PTE and transfer distance because they use an inductive coupling technique. With this method, the PTE suffers a significant drop as the distance between the transmitter and receiver coils grows. Alternately, magnetic resonance coupling (MRC) is employed as a mid-rang
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