Experiments on localized wireless power transmission using a magneto-inductive wave two-dimensional metamaterial cavity

Pham, Thanh Son; Ranaweera, A. L. A. K.; Lãm, Vũ Đình; Lee, Jong Wook

doi:10.7567/apex.9.044101

Cited by 33 publications

(29 citation statements)

References 22 publications

(42 reference statements)

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“…For example, the MMs are promising in omnidirectional WPT systems [9]. A nonidentical coils WPT system with MM cavity is also reported by Pham et al [11]. However, the WPT systems with MMs need to be further investigated.…”

Section: Introductionmentioning

confidence: 92%

“…In fact, this method is about resonant coils analysis, that is, a design procedure to maximize efficiency in three-, four-, five-coils inductive links for magnetic field repeaters to maximize their benefits [8]. Recently, the usage of MMs for WPT systems has been reported [9][10][11][12][13][14]. Some comparisons between the repeater and MMs are proposed for applications in WPT [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Chen¹,

Zhixia²,

Hu³

et al. 2017

PIER B

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Abstract-Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, including wireless charging of portable electronic devices, electric vehicles and powering of implanted biomedical devices. However, transmission efficiency decreases sharply due to divergence of magnetic field, especially in under coupled region. Electromagnetic (EM) metamaterial (MM) can manipulate the direction of EM fields due to its abnormal effective permittivity or permeability. In this paper, an ultra-thin and extremely sub-wavelength magnetic MM is designed for a 13.56 MHz WPT system to enhance magnetic field and its power transfer efficiency (PTE). The WPT systems are investigated theoretically, experimentally and by simulation. A relatively high maximum efficiency improvement of 41.7% is obtained, and the range of efficient power transfer can be greatly extended. The proposed MM structure is very compact and ultra-thin in size compared with early publications for some miniaturized applications. In addition, large area, homogeneous magnetic field is obtained and discussed using the proposed MM. Finally, the proposed MM is applied in a more practical WPT system (with a low power light bulb load) to reveal its effects. The bulb brightness intuitively verifies the efficiency improvement in the WPT system with the MM.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Chen¹,

Zhixia²,

Hu³

et al. 2017

PIER B

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show abstract

“…The metamaterialbased cavities can better confine the fields to reduce the loss [27]. This concept of field localization is further extended for a resonator-coupled WPT to increase efficiency [28]. In this work, we modify the cavity mode concept to create a new type of low-loss waveguide on the tunable metasurface.…”

Section: Field-localized Waveguide On Metasurfacementioning

confidence: 99%

Design of Tunable Metasurface Using Deep Neural Networks for Field Localized Wireless Power Transfer

2020

Self Cite

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Wireless power transfer (WPT), a convenient method for powering multiple devices, enables a truly wireless connection, eliminating the need for periodic charging and replacing a battery. To further enhance WPT, the unique characteristics of metamaterial, such as its field focusing and evanescent wave amplification, have been successfully utilized. With subwavelength characteristics, computational challenges arise when the number of metamaterial unit cells is increased. In this work, we investigate a deep neural network (DNN)-based design of the tunable metamaterial for WPT. Using structures specifically designed for different tasks, the DNN predicts the frequency spectra and synthesizes the unit cell's design parameters. When trained using a set of ~23000 randomly selected designs, we achieve an accumulated mean square error (MSE) of less than 1.5×10-3 for 97.3% of the 1929 test set. For synthesizing the unit cell's design parameters, the MSE is less than 2.5×10-3 for 95.7% of the test set. The data-driven method is further extended to a generative adversarial network (GAN) to create the WPT paths and predict the frequency spectra of them. To achieve high efficiency, we propose a cost function focusing on the spectra's transmission peak. After training using 80000 measured data, the GAN can create WPT paths that efficiently connect the transmitter and the receiver on the metasurface. The results show that the DNN provides an alternative and efficient design method for the metamaterial, replacing traditional EM-simulation-based approaches. INDEX TERMS wireless power transfer, tunable metamaterial, metasurface, field localization, deep neural network, generative adversarial network.

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“…In these equations, µ 1 and µ 2 are the relative permeability of the two materials. Combined (1) and 3, the magnetic boundary condition at the interface of the two materials with different permeability can be described as…”

Section: Hybrid Metamaterials For Near-field Enhancementmentioning

confidence: 99%

“…Wireless power transmission (WPT) has experienced tremendous progress in the past two decades. Generally, for the applications with wireless transmission distances up to 40-200 mm [1], the resonance coupling technique has surpassed the original inductive coupling one due to a relatively high transmission efficiency in the former. The resonance The associate editor coordinating the review of this manuscript and approving it for publication was Ruofei Ma .…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on Design Optimization of Hybrid Metamaterial Slab for Wireless Power Transmission

Yang

2020

IEEE Access

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Wireless power transmission (WPT) technique has advanced rapidly in the past two decades. For wireless power transmission distances from 40 to 200 mm, the resonance coupling WPT (R-WPT) technique has surpassed its original inductive coupling counterpart in terms of transmission efficiency. Nevertheless, the power transfer efficiency of a R-WPT system is still lower than that of a wired power transfer system. To increase the power transfer efficiency of a R-WPT system, metamaterial (MM) slabs are inserted between the transmitter and receiver. Moreover, it has recently been validated that a hybrid MM (HMM) slab with different resonance frequency unit cells behaves better than a homogeneous MM slab with identical resonance frequency unit cells in a R-WPT application. However, in the existing HMM slab designs for WPT applications, a trial and error approach, is commonly used to decide the physical and circuit parameters of the HMM slab due to the overwhelmingly high computational cost of numerical simulations using three-dimensional (3-D) finite element method. To overcome the deficiencies of the existing designing methodology and to fully automate the design process, a design-of-experiment (DOE) assisted sequential refinement methodology is proposed by introducing an adaptive surrogate model with tabu search method, for design optimizations of HMM slabs in R-WPT applications. Compared with the existing refinement searching procedures, the salient feature of the proposed one is its bi-directional characteristics, which can refine the searches in the promising sub spaces by intensifying sampling points; and use coarse searches or even discarding the exploitations in the worst sub spaces using some adaptive upper and lower limits of the decision parameters. To validate the feasibility and show the advantages of the proposed methodology, detailed numerical and experimental studies on a case study of a four-coil WPT system working at 13.88 MHz are conducted, and the results have shown that the HMM slab optimized by using the proposed methodology does have better performance in WPT applications when compared to its homogenous counterparts. INDEX TERMS Adaptive Kriging model, metamaterial, surrogate based optimization, wireless power transmission.

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Experiments on localized wireless power transmission using a magneto-inductive wave two-dimensional metamaterial cavity

Cited by 33 publications

References 22 publications

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Design of Tunable Metasurface Using Deep Neural Networks for Field Localized Wireless Power Transfer

Numerical and Experimental Study on Design Optimization of Hybrid Metamaterial Slab for Wireless Power Transmission

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