Yao Wen
ABSTRACT
This paper provides a detailed research on near-field-focused (NFF) wireless power transfer (WPT) application using a reflectarray antenna. We apply an analytical model to explore detailed performances on the efficiency of near-field-focused wireless power transfer assuming a Cosine distribution of the E-field amplitude on the aperture. The performance curves are obtained for planar square arrays as a function of the receiving area and the position of the geometrical focal point. A reflectarray with area of 1.3 m2 comprises 60 × 60 units is proposed and simulated at 5.8 GHz. The full-wave simulation results are in a good agreement with the design curves. Full-wave simulations demonstrate that the proposed reflectarray actually forms a focused spot at a distance of 6.3 m, and possesses a high transfer efficiency of 45% at 10 meters away from the array when the receiving area is 0.26 m2, which proves our model possesses significant guideline value for designing WPT system with high efficiency.
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