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Controlling field distribution of a wireless power transmitter

  • US 9,337,666 B2
  • Filed: 01/05/2015
  • Issued: 05/10/2016
  • Est. Priority Date: 05/14/2010
  • Status: Active Grant
First Claim
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1. A transmitter for wirelessly transferring power to a receiver device, comprising:

  • a transmit antenna configured to generate a first magnetic field for wirelessly transferring power to the receiver device, the transmit antenna comprising a first resonant circuit configured to resonate at a first frequency corresponding to an operating frequency;

    at least one parasitic antenna comprising a second resonant circuit configured to resonate at a second frequency different than the operating frequency; and

    a controller configured to activate the at least one parasitic antenna that is configured to steer the first magnetic field generated by the transmit antenna to a charging region when activated.

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