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2025-09-21
Improving the Performance of a Wireless Power Transfer with Misalignment Using Magnetic Resonators Coil and Metamaterial Slabs
By
Progress In Electromagnetics Research C, Vol. 160, 48-55, 2025
Abstract
The misalignment between the transmitter and receiver coils in the wireless power transfer WPT systems causes a reduction in the power transfer efficiency (PTE). This manuscript presents a numerical and experimental study of a WPT with different sequences that compensate for the misalignment effects of WPT systems. Circular loops were used for the transmitter's source coil and the receiver's load coil. Then, a magnetic resonator coil has been added to the transmitter and receiver circular loops. The transmitter coil (Tx) has 4 turns and is connected to a 67 pF capacitor, and the receiver coil (Rx) has 14 turns and is connected to a 9 pF capacitor, which resonates at 13 MHz. The planner 5 × 5 spiral rings array of the metamaterial (MTM) was designed. The MTM unit cell has 5 turns and is loaded with an external 100 pF capacitor. Four scenarios are studied. The first one is the Tx and Rx coils in misalignment without MTMs, and the second one is by inserting the MTM plate in the middle space. Then, double plates are used in the middle, and finally, MTM plates are located behind the coils directly. The transmission coefficient S21 is enhanced by -7 dB when the MTM plate is placed in the middle space between coils. Adding another layer of MTM results in an increase in coupling between coils and enhances the S21 by -1 dB from the previous value. The PTE is improved from 32% to 63% in the instance of misalignment when MTM plates are behind coils. Finally, measurements are achieved and show acceptable agreement with the simulated results. This work could be helpful in biomedical implants where the locations of Tx and Rx coils are frequently changed.
Citation
Noor Fadhel Habib, Mohammad Sajjad Bayati, and Nasr Alkhafaji, "Improving the Performance of a Wireless Power Transfer with Misalignment Using Magnetic Resonators Coil and Metamaterial Slabs," Progress In Electromagnetics Research C, Vol. 160, 48-55, 2025.
doi:10.2528/PIERC25062802
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