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Material-discerning sensing by measurement of different points of impedance

  • US 9,599,739 B2
  • Filed: 09/09/2014
  • Issued: 03/21/2017
  • Est. Priority Date: 09/09/2014
  • Status: Active Grant
First Claim
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1. A material-discerning proximity sensing device comprising:

  • an antenna that is arranged to radiate a radio-frequency signal;

    a capacitive sensor that is arranged to detect a change in capacitance of the capacitive sensor and that is arranged to receive the radio-frequency signal;

    an electrical quantity sensor that is arranged to detect a change of the received radio-frequency signal; and

    at least one band pass filter;

    wherein the electrical quantity sensor is arranged to detect a change in a radio-frequency signal at an output of the at least one band pass filter.

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