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Wireless power transmission

  • US 10,090,707 B2
  • Filed: 09/25/2015
  • Issued: 10/02/2018
  • Est. Priority Date: 09/25/2014
  • Status: Active Grant
First Claim
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1. A method of wirelessly delivering power via a phased antenna array, the method comprising:

  • transmitting with a transmission system, a narrow beam of radio-frequency energy having a solid angle, an elevation angle, and an azimuthal angle;

    receiving the narrow beam of radio-frequency energy with a power receiver and if the received radio-frequency energy is above a predetermined threshold, backscattering a portion of the received radio-frequency energy back towards the phased antenna array;

    receiving the backscattered portion and determining a path loss and a phase shift associated therewith;

    associating the determined path loss and phase shift with the elevation angle and azimuthal angle and storing the association in a hash table;

    identifying a most efficient transmission path based on the associations stored in the hash table;

    determining a set of supporting paths that constructively interfere with the most efficient path such that the supporting paths are within 10 degrees of the most efficient path and have less than 4 dB of loss relative to the most efficient path;

    directing energy along the most efficient transmission path and stochastically transmitting energy along the set of supporting paths and recording the transmission efficiencies thereof;

    identifying the most efficient set of supporting paths; and

    phase modulating the phased antenna array to transmit energy along the most efficient transmission path and the most efficient set of supporting paths.

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