Wireless Power Transfer in the Radiative Near Field

Okan Yurduseven, Vinay Gowda, Guy Lipworth, Tomislav Zupan, Matthew Reynolds, David Smith

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

A scheme for wireless power transfer (WPT) in the radiative near-field (Fresnel) region is presented. The proposed Fresnel WPT scheme is designed to focus microwaves to a diffraction-limited region where a detector can be positioned, achieving reasonably high power transfer efficiency over moderate distances. The configuration consists of transmit and receive microstrip patch array antennas, with the receiving antenna connected to a power-harvesting half-wave rectifier (rectenna). Fresnel region operation enables the fields radiated by the transmitting aperture to be localized both in range and cross-range. Using Fresnel region focusing, we achieve an increase of 66.8% in the amount of received power when compared to the performance of a conventional beamforming array. We also demonstrate the efficiency improvement by powering an LED using the on-axis and off-axis focusing configurations.
Original languageEnglish
Pages (from-to)1865-1868
JournalIEEE Antennas and Wireless Propagation Letters
Volume15
DOIs
Publication statusPublished - 15 Mar 2016

Keywords

  • Wireless Power Transfer
  • Antennas
  • Near-Field
  • Electromagnetic Focusing

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