Near-field RF charging pad with multi-band antenna element with adaptive loading to efficiently charge an electronic device at any position on the pad

  • US 10,079,515 B2
  • Filed: 12/06/2017
  • Issued: 09/18/2018
  • Est. Priority Date: 12/12/2016
  • Status: Active Grant
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First Claim
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1. A radio frequency (RF) charging pad, comprising:

  • one or more processors for monitoring an amount of energy that is transferred from the RF charging pad to an RF receiver of an electronic device; and

    one or more transmitting antenna elements that are configured to communicate with the one or more processors for transmitting RF signals to the RF receiver of the electronic device, each respective transmitting antenna element including;

    a conductive line forming a meandered line pattern;

    an input terminal at a first end of the conductive line for receiving current that flows through the conductive line at a frequency controlled by the one or more processors; and

    a plurality of adaptive load terminals, distinct from the input terminal and distinct from each other, at a plurality of positions of the conductive line, each respective adaptive load terminal of the plurality of adaptive load terminals coupled with a respective component that is configured to be controlled by the one or more processors and is configured to allow modifying a respective impedance value at each respective adaptive load terminal,wherein the one or more processors are configured to adaptively adjust at least one of the frequency and a respective impedance value at one or more of the plurality of adaptive load terminals to optimize the amount of energy that is transferred from the one or more transmitting antenna elements to the RF receiver of the electronic device.

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