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Method and apparatus for proximity sensing

  • US 9,998,870 B1
  • Filed: 12/08/2016
  • Issued: 06/12/2018
  • Est. Priority Date: 12/08/2016
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, by a receiver of a first device, electromagnetic waves that are generated by a transmitter at a physical interface of a transmission medium, wherein the electromagnetic waves propagate without requiring an electrical return path, and wherein the electromagnetic waves are guided by the transmission medium to the receiver of the first device;

    monitoring, by the first device, a parameter associated with the electromagnetic waves; and

    detecting, by the first device, a physical object in proximity to the transmission medium according to a change in the parameter associated with the electromagnetic waves.

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