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Wireless power transfer using tunable metamaterial systems and methods

  • US 10,236,576 B2
  • Filed: 12/31/2015
  • Issued: 03/19/2019
  • Est. Priority Date: 09/04/2015
  • Status: Active Grant
First Claim
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1. A method of manufacturing a static wireless power transmitter, comprising:

  • determining a scattering matrix (S-Matrix) of field amplitudes for each of a plurality of lumped ports associated with a wireless power transmitter, includinga plurality of lumped antenna ports wherein each lumped antenna port corresponds to an impedance value of a lumped impedance element in communication with at least one sub-wavelength antenna element of the wireless power transmitter,wherein the at least one sub-wavelength antenna element is configured to scatter received electromagnetic fields, andat least one lumped external port located physically external to the wireless power transmitter,wherein the S-Matrix is expressible in terms of an impedance matrix, Z Matrix, with impedance values of each of the plurality of lumped ports;

    identifying a target electromagnetic radiation pattern of the wireless power transmitter defined in terms of target field amplitudes in the S Matrix for the at least one lumped external port;

    determining an optimized port impedance vector, {zn}, of impedance values for each of the lumped antenna ports that results in an S-Matrix element for the at least one lumped external port that approximates the target field amplitude for an operating frequency;

    forming a plurality of sub-wavelength antenna elements configured to scatter received electromagnetic fields; and

    forming a plurality of impedance elements in communication with the plurality of sub-wavelength antenna elements with impedance values corresponding to the optimized impedance vector {zn}.

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