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Near field communication

  • US 8,212,735 B2
  • Filed: 06/05/2009
  • Issued: 07/03/2012
  • Est. Priority Date: 06/05/2009
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an antenna configured for efficient far field communication at a first frequency;

    an inductive element comprising a plurality of series-connected coiled portions, including a first coiled portion and a second coiled portion, wherein the inductive element is configured to provide near field communication at a second frequency; and

    at least one reactive element parallel connected between the first coiled portion and the second coiled portion, wherein the at least one reactive element has a lower impedance at the first frequency than at the second frequency,wherein the inductive element and the at least one reactive element are configured to be co-located with the antenna without affecting performance of the antenna.

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