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Ajustable antenna

  • US 9,819,402 B2
  • Filed: 05/30/2013
  • Issued: 11/14/2017
  • Est. Priority Date: 05/31/2012
  • Status: Active Grant
First Claim
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1. An antenna comprising:

  • a set of at least two antenna coils;

    a bank of at least two capacitors; and

    a switching arrangement,wherein the switching arrangement is selectably configurable to define at least two operating modes, in which different combinations of antenna coils and capacitors are selectably connected into circuit, wherein the different combinations of antenna coils and capacitors, define the same operating frequency in the two operating modes but with a different number of antenna coils for the respective operating modes, and wherein the operating modes comprise different power consumption modes of operation, corresponding to respective different amounts of power from the use of the set of antenna coils to generate a magnetic field, wherein in a first of the operating modes, a first current is provided to a first set of a first number of antenna coils for consumption by the first set, and wherein in a second of the operating modes, a second current, higher than the first current, is provided to a second set of a second number of antenna coils, wherein the second number of antenna coils is lower than the first number of antenna coils.

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