Wireless Power Transfer in Concrete via Strongly Coupled Magnetic Resonance

The signal fading in wireless underground sensor networks (WUSNs), which is caused by lossy media such as soil and sand, can be reduced by applying technology of magnetoinductive (MI) propagation. This technology can effectively establish a communication at very low frequency (VLF). In contrast to the previous studies in the literature, which mostly focus on the propagation of plane waves, we propose a new approach based on the plane wave expansion (PWE) to model the near field MI waves. The proposed approach is based on excitation of a point source, which is a common case in a practical WUSN. The frequent usage of square lattice MI structure is investigated. To verify the mathematical derivation, the simulation of time domain based on the fourth-order Runge-Kutta (RK) method is carried out. Simulation results show that the new model can provide a precise prediction to the MI wave's propagation, with the computation load being one-tenth of that of the time domain simulation. The characteristics of the propagation of the MI waves are presented and discussed. Finally, the reflection on the edge of the MI structure is reduced by analysing the terminal matching conditions and calculating a method for matching impedances.

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“…Substituting (3) into (19) and assuming that = , , we can obtain the dispersion equation as center to right = − 2 sin ( ) ,…”

Section: Discussionmentioning

confidence: 99%

“…The MI waveguide was introduced by Sun and Akyildiz in [17] to the WUSNs field as a new proposed technology in the physical layer of sensor networks. The studies in [18][19][20][21] show that the MI waveguides have the capabilities of transmitting powers. Therefore, the MI waveguides are useful to recharge the WUSN nodes.…”

Section: Introductionmentioning

confidence: 99%

Propagation Modeling of Point Source Excited Magnetoinductive Waves Based on a New Plane Wave Expansion Approach

Liu

Zhang

Zhu

et al. 2015

Mathematical Problems in Engineering

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“…The system can be described by an equivalent circuit diagram as shown in Figure 2, which illustrates the hybrid systems with two pairs of resonators. From it, a four-port network model can be derived, based on Kirchoff's voltage law [29,30]. The electromagnetic induction field (H) for one of the parallel coaxial loops can, as follows based on Ampere's law and Faraday's electromagnetic induction law [31,32], be shown as:…”

Section: Theoretical Analysis Of Strongly-coupled Wpt Systemsmentioning

confidence: 99%

Combined Conformal Strongly-Coupled Magnetic Resonance for Efficient Wireless Power Transfer

et al. 2017

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This paper proposes a hybrid circuit between a conformal strongly-coupled magnetic resonance (CSCMR) and a strongly-coupled magnetic resonance (SCMR), for better wireless power transmission (WPT). This combination promises to enhance the flexibility of the proposed four-loop WPT system. The maximum efficiency at various distances is achieved by combining coupling-matching between the source and transmitting coils along with the coupling factor between the transmitting and receiving coils. Furthermore, the distance between transmitting and receiving coils is investigated along with the distance relationship between the source loop and transmission coil, in order to achieve the maximum efficiency of the proposed hybrid WPT system. The results indicate that the proposed approach can be effectively employed at distances comparatively smaller than the maximum distance without frequency matching. The achievable efficiency can be as high as 84% for the whole working range of the transmitter. In addition, the proposed hybrid system allows more spatial freedom compared to existing chargers.

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“…The WPT system has a strongly coupled magnetic field between the transmitter and each receiver [6][7][8][9]. Fig.…”

Section: Analysis Of Magnetic Resonant Coupling Systemmentioning

confidence: 99%

Omnidirectional Resonator in X-Y Plane Using a Crisscross Structure for Wireless Power Transfer

Kim¹,

Seo²

2015

Journal of electromagnetic engineering and science

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Magnetic resonant coupling is more efficient than inductive coupling for transferring power wirelessly over a distance. However, a conventional resonant wireless power transfer (WPT) system requires a transmitter and receiver pair in exactly coaxial positions. We propose a resonator that can serve as an omnidirectional WPT system. A magnetic field will be generated by the current flowed through the transmitter. This magnetic field radiates omnidirectionally in the x-y plane because of the crisscross structure characteristic of the transmitter. The proposed resonator is demonstrated by using a single port. To check the received S21 and transfer efficiency, we moved the receiver around the transmitter at different distances (50-350 mm). As a result, the transmission efficiency is found to be 48%-54% at 200 mm.

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Wireless Power Transfer in Concrete via Strongly Coupled Magnetic Resonance

Cited by 102 publications

References 16 publications

Propagation Modeling of Point Source Excited Magnetoinductive Waves Based on a New Plane Wave Expansion Approach

Propagation Modeling of Point Source Excited Magnetoinductive Waves Based on a New Plane Wave Expansion Approach

Combined Conformal Strongly-Coupled Magnetic Resonance for Efficient Wireless Power Transfer

Omnidirectional Resonator in X-Y Plane Using a Crisscross Structure for Wireless Power Transfer

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