Miniaturized highly-efficient designs for near-field power transfer system

  • US 10,320,446 B2
  • Filed: 09/19/2016
  • Issued: 06/11/2019
  • Est. Priority Date: 12/24/2015
  • Status: Active Grant
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First Claim
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1. A near-field radio frequency (RF) power transfer system comprising a transmitter, the transmitter comprising:

  • a first antenna element disposed on or below a first surface of a substrate and configured to carry a first current in a first direction during a first time period to generate a first RF radiation;

    a second antenna element disposed on or below the first surface of the substrate and configured to carry a second current in a second direction, distinct from and opposite to the first direction, during the first time period to generate a second RF radiation such that (i) a far-field portion of the second RF radiation substantially cancels a far-field portion of the first RF radiation, and (ii) a near-field portion of the second RF radiation does not substantially cancel a near-field portion of the first RF radiation;

    a ground plane disposed on or below a second surface of the substrate, wherein the second surface is opposite to the first surface;

    a first via passing through the ground plane, wherein the first via contains a first power feed line configured to supply the first current; and

    a second via passing through the ground plane, wherein the second via is distinct from the first via and contains a second power feed line configured to supply the second current.

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