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Ambient backscatter transceivers, apparatuses, systems, and methods for communicating using backscatter of ambient RF signals

  • US 10,447,331 B2
  • Filed: 07/24/2018
  • Issued: 10/15/2019
  • Est. Priority Date: 03/22/2013
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a backscatter transceiver comprising;

    an antenna configured to receive a radio frequency (RF) signal;

    a demodulator coupled to the antenna, the demodulator comprising a threshold circuit configured to compare variations in the RF signal representative of a first backscattered RF signal, wherein the demodulator is configured to demodulate the first backscattered RF signal in part using the threshold circuit to retrieve at least one first impedance state; and

    a transmitter configured to modulate an impedance of the antenna to provide a second backscattered ambient RF signal encoded with modulated symbols indicative of at least one second impedance state associated with the antenna.

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