An analysis of beamed wireless power transfer in the Fresnel zone using a dynamic, metasurface aperture

David Smith, Vinay Gowda, Okan Yurduseven, Stéphane Larouche, Guy Lipworth, Yaroslav Urzhumov, Matthew Reynolds

Research output: Contribution to journalArticle

37 Citations (Scopus)
65 Downloads (Pure)

Abstract

Wireless power transfer (WPT) has been an active topic of research, with a number of WPT schemes implemented in the near-field (coupling) and far-field (radiation) regimes. Here, we consider a beamed WPT scheme based on a dynamically reconfigurable source aperture transferring power to receiving devices within the Fresnel region. In this context, the dynamic aperture resembles a reconfigurable lens capable of focusing power to a well-defined spot, whose dimension can be related to a point spread function. The necessary amplitude and phase distribution of the field imposed over the aperture can be determined in a holographic sense, by interfering a hypothetical point source located at the receiver location with a plane wave at the aperture location. While conventional technologies, such as phased arrays, can achieve the required control over phase and amplitude, they typically do so at a high cost; alternatively, metasurface apertures can achieve dynamic focusing with potentially lower cost. We present an initial tradeoff analysis of the Fresnel region WPT concept assuming a metasurface aperture, relating the key parameters such as spot size, aperture size, wavelength, and focal distance, as well as reviewing system considerations such as the availability of sources and power transfer efficiency. We find that approximate design formulas derived from the Gaussian optics approximation provide useful estimates of system performance, including transfer efficiency and coverage volume. The accuracy of these formulas is confirmed through numerical studies
Original languageEnglish
JournalJournal of Applied Physics
Volume121
Issue number1
DOIs
Publication statusPublished - 03 Jan 2017
Externally publishedYes

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