access icon free Modified mu-zero resonator for efficient wireless power transfer

A mu-zero resonator with an effective zero permeability is presented for efficient wireless power transfer (WPT) using resonant inductive coupling (RIC). An N-cell mu-zero resonator is modified to maintain a fixed size and resonance frequencies that are important design factors of WPT using RIC because they are related to the magnetic coupling coefficient and Q-factor. The resonator has many resonant modes with the extraordinary phenomena of metamaterials such as an infinite wavelength wave and backward-wave propagation. An analysis of the resonant modes and a design of the N-cell mu-zero resonator is performed by theory and full-wave simulation based on a dispersion diagram and magnetic field distribution. The power transfer efficiencies of one-cell and two-cell mu-zero resonators are simulated and measured. To optimise the transfer efficiency of the WPT system using the mu-zero resonance (MZR) mode, which supports stronger coupling than the other modes, an equivalent circuit of mu-zero resonator is analysed for a high Q-factor. The theoretical, simulated, and measured results of a one-cell resonator with optimum values confirm that an efficient WPT system can be successfully designed by the MZR mode.

Inspec keywords: metamaterials; Q-factor; resonators; inductive power transmission

Other keywords: modified mu-zero resonator; zero permeability; two-cell mu-zero resonators; N-cell mu-zero resonator; power transfer efficiencies; full-wave simulation; wireless power transfer; Q-factor; magnetic field distribution; resonant inductive coupling; mu-zero resonance mode; backward-wave propagation; MZR mode; one-cell mu-zero resonators; dispersion diagram; magnetic coupling coefficient; WPT system; infinite wavelength wave; metamaterials

Subjects: Other power transmission

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-map.2013.0387
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