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Multi-purpose stylus antenna

  • US 8,922,527 B2
  • Filed: 03/16/2012
  • Issued: 12/30/2014
  • Est. Priority Date: 02/15/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a capacitive sense array comprising a plurality of capacitive sense elements, the plurality of capacitive sense elements configured to detect a conductive object proximate to the capacitive sense array; and

    a conductive element disposed adjacent to the capacitive sense array, wherein the conductive element is configured to operate as an antenna in a first mode and as an additional capacitive sense element in a second mode;

    a capacitance sensor coupled to the capacitive sense array and selectively coupled to the conductive element in the second mode, wherein the capacitance sensor is configured to measure capacitances associated with the plurality of capacitive sense elements in the first mode and to measure an additional capacitance associated with the conductive element in the second mode; and

    a transmitter selectively coupled to the conductive element in the first mode.

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