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Proceedings ArticleDOI

Wireless power transfer system using loop antenna and its gain enhancement using SRR metamaterial

01 Feb 2017-pp 264-267
TL;DR: In this paper, the authors designed and developed loop antennas and split ring resonators (SRR) metamaterials with desired specifications to understand wireless power transfer system using loop antennas.
Abstract: This project involves understanding wireless power transfer system using loop antennas and split ring resonators(SRR) metamaterial. The goal is design and development of loop antenna and SRR metamaterial with desired specifications. Gain enhancement by metamaterial is demonstrated between transmitting and receiving antennas.
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24 Apr 2018

3 citations


Additional excerpts

  • ...Metamaterials were also applied for improvements of WPT systems performance in [48]-[51]....

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References
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Journal ArticleDOI
TL;DR: In this article, the physical phenomenon of long-lifetime resonant electromagnetic states with localized slowly-evanescent field patterns was investigated to transfer energy efficiently over non-negligible distances even in the presence of extraneous environmental objects.

1,628 citations

01 Mar 2012
TL;DR: In this paper, the design and simulation of a double S-shaped metamaterial in the microwave range is presented, where the design tool is the HFSS software which uses the finite element method.
Abstract: Metamaterials are defined as artificial electromagnetic structures based on the assembly of magnetic resonators and infinitely long metal rods at sub wavelength scale, which have the negative permittivity and the negative permeability simultaneously in a specific frequency range. However there are also some new metamaterial structures being explored which exhibit the same behavior. In this paper, we present the design, and simulation of a double S-shaped metamaterial in the microwave range. The design tool is the HFSS software which uses the finite element method. The extraction of effective parameters by the method of reflection- transmission coefficients demonstrates the metamaterial behavior of the said structure.

38 citations


"Wireless power transfer system usin..." refers methods in this paper

  • ...The metallic ring does function of an inductance coil (L) and the split in the ring introduces a parallel plate capacitor (C).[4] The resonance frequency of SRR with geometrical parameters shown can be derived as follows: Magnetic resonance frequency ωm =1/√ (LC) Capacitance, C = ( εo εr Α ) / d = (εo εr w t / d) Inductance (L) = μo coil area / length (with a single turn in the coil)....

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Proceedings ArticleDOI
04 Jul 2010
TL;DR: In this article, the authors proposed a simple design method of a wireless power transfer system using 13.56MHz loop antennas, where the measurements of coupling coefficients and the equations for equivalent circuit model about loop antennas without the complicated electromagnetic analysis.
Abstract: In this paper, we propose a simple design method of a wireless power transfer system using 13.56MHz loop antennas. This method can simple design a wireless power transfer system by only using the measurements of coupling coefficients and the equations for equivalent circuit model about loop antennas without the complicated electromagnetic analysis. Using the proposed design method, a wireless power transfer system with a pair of loop antennas operating at the frequency of 13.56MHz, which have a dimension of 50×50 cm2, is designed and implemented. The input return loss, coupling coefficient, efficiency, and input impedance variation with respect to the distance between loop antennas were measured. The proposed design method provides good agreements between measured and predicted results. Also, the wireless power transfer system with impedance matching circuits designed by the proposed design method shows two times higher efficiency characteristics than the case with the general 50 Ω impedance matching circuits. Therefore, we verified that our design method could be an effective tool to design a wireless power transfer system.

21 citations


Additional excerpts

  • ...The antenna that is used in this project is loop antenna[2] [3]....

    [...]

Proceedings Article
01 Nov 2014
TL;DR: In this paper, the authors presented results of experimental investigation on metamaterial enhanced wireless power transfer (WPT) system and identified that there is a certain threshold for distance between transmitter and receiver resonators beyond which the power transfer efficiency is degraded.
Abstract: Recently, metamaterials has been emerged as one of the potential candidate for enhancing the efficiency of resonator coupled wireless power transfer (WPT) systems. This paper presents results of experimental investigation on metamaterial enhanced WPT System. Isotropic bulk metamaterial structure has been fabricated by assembling 5 × 5 × 1 array of three turn spiral resonators. Measurements show that the designed metamaterial structure has a great potential in extending the power transfer distance of resonator coupled WPT System. Also we have identified that there is a certain threshold for distance between transmitter and receiver resonators beyond in which the power transfer efficiency is enhanced. The threshold is attributed to the loss of the metamaterials.

3 citations

Proceedings ArticleDOI
30 Jul 2011
TL;DR: The detailed theoretical and simulated analyses in this paper has shown that it can be achieved to tranfer power without electrical wires using double loop antennas based on magnetic dipole theory.
Abstract: According to electromagnetic theory, there are several ways to tranfer power without electrical wires. We found another method for the purpose based on magnetic dipole theory, the detailed theoretical and simulated analyses in this paper has shown that it can be achieved. We used one loop antenna for transfer and the other for receiving, and found the system efficiency saturates when the opreationg frequency reaches 8MHz, the maximal output power is about 0.02mW. The low efficiency of the magnetic dipole makes the double loop antennas transfer efficiency and output power not ideal. Therefore the suggestion of the experiment is using strong directional helical antenna to get a better result in the future.

3 citations