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Frequency divider with single resonant circuit and use thereof as a transponder in a presence detection system

  • US 4,654,641 A
  • Filed: 09/13/1985
  • Issued: 03/31/1987
  • Est. Priority Date: 09/13/1985
  • Status: Expired due to Term
First Claim
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1. A batteryless, portable, frequency divider, consisting ofa single resonant circuit comprisinga nonlinear inductor having a core made of amorphous magnetic material;

  • anda capacitance connected in series with the inductor to define a resonant circuit that detects electromagnetic radiation at a first predetermined frequency and responds to said detection by transmitting electromagnetic radiation at a second frequency that is a sub-harmonic of the first frequency.

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