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SAR Control Using Capacitive Sensor and Transmission Duty Cycle Control in a Wireless Device

  • US 20130169348A1
  • Filed: 01/04/2012
  • Published: 07/04/2013
  • Est. Priority Date: 01/04/2012
  • Status: Active Grant
First Claim
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1. A wireless device for providing specific absorption rate (SAR) control comprising:

  • a wireless transmitter;

    a capacitance sensor; and

    a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to;

    receive a first capacitance measurement from the capacitance sensor;

    estimate a relative proximity of a human body to the apparatus based on the measurement;

    determine a target transmission time for the wireless transmitter within a time period based on the estimate; and

    switch off the wireless transmitter for a portion of the time period if a transmission time of the wireless transmitter during the time period exceeds the target transmission time.

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