Abstract
This letter proposes a novel cavity resonant wireless power transfer that can optimize the load condition of a parasitic antenna without receiver feedback or the need to know the S-parameter <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a priori</i> . In this letter, it is hypothesized that the transmission efficiency to a receiver can be indirectly maximized by minimizing reflection observed at the signal source, and the proposed method is based on this. Furthermore, an <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i> S-parameter estimation based on load modulation is proposed. This estimation provides a closed-form optimum load condition for minimizing reflection, and avoids the need for a brute force search with load sweeping. Experiments carried out in a 200 mm conductive cube cavity successfully demonstrate the effectiveness of the proposed method, which obtains a high transmission efficiency of 42.2% that is comparable to the achievable maximum.
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