Metamaterial-inspired loop antennas for wireless power transmission

The concept of wireless power transmission (WPT) was initiated by N. Tesla in 1914[1]. The efficient non-radiative power transfer was demonstrated by the experiment [2]. This article shows that the efficiency of the power transfer is about 40 % in 2meters (V15) at 9.9MHz employing two single loops and two helical coils for resonance. In this paper, we provide a thin WPT system mountable on any flat objects. Two metamaterial-inspired [3–6] loop antennas compose the WPT system. The metamaterial-inspired antenna is for a uniform current distribution using capacitive loadings [7], which significantly increases the magnetic field intensity in the loop. The performance of the proposed WPT system is evaluated in various environments to investigate its usefulness for short range power transmission.

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