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Low cost wireless (resistive) sensor based on impedance coupling/modulation using MRC

  • US 9,620,283 B2
  • Filed: 02/25/2015
  • Issued: 04/11/2017
  • Est. Priority Date: 02/27/2014
  • Status: Active Grant
First Claim
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1. A magnetic resonance coupling (MRC) circuit comprising:

  • a control circuit including a base coil, a variable current source, a variable tuning capacitor and a control load, said variable current source selectively providing a predetermined current to the base coil so as to generate an oscillating magnetic field at a predetermined frequency; and

    at least one receiver circuit including a receiver coil, a tuning capacitor and a sensor that measures an environmental condition, said receiver coil being tuned to a resonant frequency that causes it to be magnetically coupled to the base coil at the predetermined frequency, wherein sensor measurements provided by the sensor in the at least one receiver circuit cause a change in the magnetic coupling between the base coil and the receiver coil that causes a change in the voltage across the control load.

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