Compact Triplex-layer Metamaterials Design for Wireless Power Transfer Efficiency Enhancement
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In this paper, a compact triplex-layer and low-frequency metamaterial design scheme is presented. The triplex-layer metal cell can be extended easily and allows for the construction of 5×5 unit-cell sample with dimensions of 36mm x 36mm and operating at a working frequency of 6.78MHz. Results show that using the metamaterial sample in a wireless power transfer (WPT) system results in an efficiency enhancement of 26.8% at a working distance of 15 cm. From simulations and experiments, it is found that the proposed system outperforms two-layer metamaterial-coupled WPT system in terms of efficiency, range and size.Keywords:
Wireless Power Transfer
Metamaterial have shown great power of controlling the EM waves, which is mainly about the propagation property of far field. In this paper, three-dimensional (3D) metamaterials are used in near field wireless power transfer (WPT) system for efficiency enhanced. The 3D metamaterial structure is composed of 4×4×1-array of five-turn spiral resonators. The WPT with bulk metamaterial is investigated theoretically, experimentally, and by simulation. To verify the enhancement of the WPT system by using 3D metamaterial, the four-coil systems integrated with and without bulk metamaterial are investigated by vector network analyzer (VNA). As a result, the maximum efficiency improvement of 20% is obtained with the 3D metamaterials at 1.5m transfer distance. At the same time, the range of efficient power transfer can be greatly extended.
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In recent years, research on wireless power transmission (WPT) technologies has been attracting more attention after MIT introduced the magnetic resonance technology in 2007. Wireless magnetic resonant power transfer is an emerging technology that has many advantages over other wireless power transfer methods due to its safety and flexible comfortable supplying energy needs to electric devices. At the same time, with the constant improvement and extension application rang of unmanned aerial vehicles (UAVs), the main problem of the UAV is that it cannot carry out remote tasks because of its weak cruising ability. In this paper, we develop a wireless magnetic resonant power transfer system that enables UAVs to provide power to, and which can solve the problem of UAV's endurance.
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Wireless Power Transfer: Wireless power transfer technology allowsdevices to be charged without the need for cables or wires.
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Metamaterial composed of artificial periodic structure is applied to a wireless power transfer system to enhance the efficiency of long distance power transfer. Metamaterial can control the direction of magnetic fields due to its negative permeability. Previously reported metamaterials were too thick and large in size to increase the power transfer distance. In this paper, ultra-thin (0.16 cm) and small (18.6 × 18.6 cm) metamaterial structure is proposed and its enhanced efficiency (with maximum of 44.2 % improvement) is demonstrated. Furthermore, this paper shows simplified modeling method for complicated metamaterial structure simulation.
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The articles in this special section were presented at the 2014 IEEE Wireless Power Transfer Conference (WPTC)that was held in Jeju, Korea, May 8–9, 2014. Wireless power transfer technologies can provide us a freedom from hardwired connectivity when using electrical powers for mobile platforms, home appliances, and automotive vehicles. Furthermore, we can reduce the cost of system power wirings and will be able to reduce capacity and weight of batteries. Among the various wireless power transfer technologies, the resonant magnetic field technology can offer not only the highest power transfer efficiency, but also the higher wireless transmission power in near-field distance, especially for automotive wireless power charging applications.
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This book will cover the recent advances and applications in metamaterials. It begins by presenting the fundamental concepts of metamaterials, including characterization. The book then moves on to discuss microwave metamaterial sensors, metamaterial absorbers in microwave range, metamaterial absorbers in high frequencies, energy harvesting application of metamaterials, seismic metamaterial, artificial intelligence applications in metamaterial antennas, frequency selective surfaces in metamaterials, metasurfaces, and biomedical applications of metamaterials. In all sections, the design procedure of artificial materials and the evaluation of constitutive parameters and related parameters including how they affect results, will be explained. Novel worked examples will be carried out in each chapter. Key features • Presents an extensive guide for the common applications of metamaterials. • Explains key points in the design and analysis of metamaterials. • Includes comprehensive examples of metamaterial applications. • Provides case studies, worked examples, end of chapter summaries.
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This chapter contains sections titled: Introduction Metamaterials Background RF LC Metamaterials RF Tunable "Meta-Surfaces" with LCs LC Tuning of Meta-Atoms Optical Metamaterials with LCs LC Interaction with Plasmonic Metamaterial Structures Liquid Crystals in Self-Assembled Metamaterials Chiral Metamaterials Conclusion Outlook References
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In this paper, wireless power transfer based on resonant coupling with metamaterials is studied. We show with numerical studies that the coupling between transmitter and receiver can be enhanced, and the power transfer efficiency can be improved by metamaterials. A prototype wireless power transfer system and a metamaterial is designed and built. Experiment results prove the efficiency improvement with the fabricated metamaterial. The system with metamaterial is capable of transferring power wirelessly at roughly double the efficiency of the same system without a metamaterial.
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As a unique group of advanced artificial materials, metamaterials have found many interesting applications in various devices due to the ability to control electromagnetic fields. The metamaterial provides the prospect of new opportunities for the wireless power transfer (WPT) system to improve efficiency and reduce magnetic flux density. This review paper evaluates the performance of the WPT system with metamaterial from both principles and functions aspects. The objectives of this review include: (1) to present the research process and bottlenecks of metamaterial in the WPT system; (2) to clarify the design solution and checking method of the metamaterial and (3) to identify the challenges and opportunities based on the functional of the WPT system integration with metamaterial. Therefore, the process on metamaterial design, working principle of metamaterial, optimal method, equivalent model, and experimental method are reviewed. The recent efforts of the WPT system with metamaterial in efficiency enhancement, misalignments, magnetic field reduction are illustrated. Finally, the challenges and prospects of metamaterial based on the WPT system are concluded.
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