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

  • US 10,256,677 B2
  • Filed: 02/03/2017
  • Issued: 04/09/2019
  • 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:

  • at least one processor 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 in communication 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;

    a first 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 second terminal, distinct from the first terminal, at a second end of the conductive line, the second terminal coupled with a component that is controlled by the at least one processor and allows for modifying an impedance value at the second terminal,wherein the at least one processor is configured to adaptively adjust the frequency and/or the impedance value 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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