A Wireless Power Transfer System Based on Dual-Band Metamaterials

Zheng, Zonghua; Fang, Xin; Zheng, Yuanyuan; Hao, Feng

doi:10.1109/lmwc.2022.3140535

Cited by 20 publications

(9 citation statements)

References 11 publications

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“…Therefore, more power is radiated back from the human body due to the dielectric mismatch. These mismatches can be reduce using high-permittivity matching layers 27 , metasurfaces and metamaterials [37][38][39][40] , parasitic patches 25 , and conformal surfaces 41 . In order to minimize such a mismatch, a matching layer of high dielectric constant can be used 27,36 .…”

Section: Resultsmentioning

confidence: 99%

Wireless power transfer system for deep-implanted biomedical devices

Iqbal

Al‐Hasan

Mabrouk

et al. 2022

Sci Rep

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In this paper, a dual-band implantable rectenna is proposed for recharging and operating biomedical implantable devices at 0.915 and 2.45 GHz. The rectenna system consists of a compact dual-band antenna based on a meandered-resonator as well as efficient dual-band rectifier circuit. Both components (antenna and rectifier) are integrated inside a capsule device to simulate and experimentally validate the rectenna. The antenna occupies lower volume ($$5 \times 5.25 \times 0.25$$ 5 × 5.25 × 0.25 $$\hbox {mm}^{3}$$ mm 3 ), where compactness is achieved using meandered geometry and a slotted ground plane. It maintains quasi-omnidirectional radiation patterns and peak realized gains of −22.1 dBi (915 MHz) and −19.6 dBi (2.45 GHz); thus, its capability is enhanced to harvest the ambient energy from multiple directions. Moreover, a dual-band rectifier is designed using a dual-branch matching network (an L-matching network and open-circuited stub in each branch) with a radio frequency (RF) to direct current (DC) conversion efficiency of 79.9% for the input power of 1 dBm (lower band: 0.915 GHz) and 72.8% for the input power of 3 dBm (upper band: 2.45 GHz). To validate the concept of the rectenna, the implantable antenna and rectifier are fabricated and attached together inside a capsule device, with the measured results verifying the simulated responses. The proposed rectenna efficiently rectifies two RF signals and effectively superimposes on a single load, thus, providing a distinct advantage compared to single-band rectennas. To the best of the authors’ knowledge, this is the first-ever implantable rectenna to perform dual-band RF signal rectification.

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Section: Resultsmentioning

confidence: 99%

Wireless power transfer system for deep-implanted biomedical devices

Iqbal

Al‐Hasan

Mabrouk

et al. 2022

Sci Rep

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“…In order to study the impact of the MTM placement at different transmission distances, the S-parameter characteristics of the proposed WPT system are, respectively, It is reported that the WPT system can be modeled as a two-port network. 34 The transfer efficiency of the system can be expressed as…”

Section: The Wpt System With One Mtm Slabmentioning

confidence: 99%

“…It is reported that the WPT system can be modeled as a two‐port network 34 . The transfer efficiency of the system can be expressed as

η goodbreak= \frac{{(||, S_{21})}^{2}}{1 - {|S_{11}|}^{2}}

…”

Section: Evaluation Of the Wpt System With The Proposed Mtmmentioning

confidence: 99%

Design of new metamaterial with negative permeability for efficient wireless power transfer

Wang,

Shi

et al. 2023

Circuit Theory & Apps

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SummaryTo solve the problem that the efficiency of a wireless power transfer system decreases with increasing transmission distance, metamaterial (MTM) has offered an effective solution. In this paper, a novel compact MTM with negative permeability is designed to improve the transfer efficiency of wireless power transfer at the operating frequency of 13.56 MHz. By placing the MTM slab at different positions between coils, the transmission coefficient of the wireless power transfer system with one MTM slab is calculated. Also, the impact of transmission distance is studied. Based on the two‐port network method, the transfer efficiency of wireless power transfer is respectively calculated for the system with one MTM slab and with two MTM slabs. The results demonstrate that transfer efficiency at the transmission distance of 150, 200, and 250 mm are, respectively, 82.4%, 67.8%, and 47.3% when one MTM slab is introduced. For the system with two MTM slabs, the corresponding transfer efficiency is 84.9%, 77.3%, and 66.1% separately. Compared with the system without MTM, it is found that there is a large improvement in transfer efficiency especially when two MTM slabs are positioned between coils at the transmission distance of 250 mm. The magnetic field distribution of the system with one or two MTM slabs introduced is investigated. The results show that magnetic coupling between coils is strengthened, which is favorable for transfer efficiency enhancement.

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“…In Wang et al, 28 a metamaterial with a planar spiral structure is designed and analyzed for WPT. Two kinds of metamaterials that are self‐resonant dual‐band negative permeability metamaterial and externally compensated dual‐band negative permeability metamaterial are designed to improve transmission efficiency of a WPT system in Zheng et al 29 A singled‐sided metasurface consisting of two open rings is proposed to amplify the near evanescent field and increase the efficiency of power transfer in Younesiraad and Bemani 30 . In addition, there are also some reconfigurable magnetic metamaterial structures, which are developed to enhance the efficiency of a WPT system 31–34 .…”

Section: Introductionmentioning

confidence: 99%

A metamaterial‐incorporated wireless power transmission system for efficiency enhancement

Wang

Guo

Shi

et al. 2023

Circuit Theory & Apps

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Summary In this paper, an efficient wireless power transmission (WPT) system that incorporates a new negative permeability metamaterial is presented. The operating principle of the metamaterial with negative permeability is first analyzed. To improve transmission efficiency of the WPT system at the operating frequency of 13.56 MHz, a new metamaterial with three open rings is designed. By respectively placing a single metamaterial slab and double metamaterial slabs at different positions between transmitting coil and receiving coil, the performance of the proposed WPT system is evaluated by simulation work. The corresponding magnetic field distribution is also analyzed. Besides, comparison is made with the conventional WPT system without metamaterial. It is found that transmission efficiency of the proposed WPT system is obviously improved when incorporating the metamaterial since the designed metamaterial effectively focuses magnetic field towards the receiving coil. Comparing with the conventional system, the results also show that the proposed WPT system is more robust to lateral and angular misalignment of the receiving coil. With the designed metamaterial, it is found that the proposed system with double metamaterial slabs performs better than that with a single metamaterial slab.

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A Wireless Power Transfer System Based on Dual-Band Metamaterials

Cited by 20 publications

References 11 publications

Wireless power transfer system for deep-implanted biomedical devices

Wireless power transfer system for deep-implanted biomedical devices

Design of new metamaterial with negative permeability for efficient wireless power transfer

A metamaterial‐incorporated wireless power transmission system for efficiency enhancement

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