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Radio frequency access control system and method

  • US 8,989,657 B2
  • Filed: 03/08/2012
  • Issued: 03/24/2015
  • Est. Priority Date: 03/08/2011
  • Status: Expired due to Fees
First Claim
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1. An access control system comprising:

  • at least one receiver-responder comprisinga receiver-responder magnetic flux antenna,a plurality of RF tone detectors electrically coupled with the receiver-responder magnetic flux antenna,a microcontroller electrically coupled with the plurality of RF tone detectors,a responder RF burst generator electrically coupled with the microcontroller and the receiver-responder magnetic flux antenna; and

    a transmitter initiator comprisinga transmitter-initiator magnetic flux antenna constructed and arranged to direct a magnetic field in a particular angular direction across an open-air gap, wherein the transmitter-initiator magnetic flux antenna and the receiver-responder magnetic flux antenna define the open-air gap therebetween, and wherein the transmitter-initiator magnetic flux antenna comprisesa paramagnetic housing,electromagnetic windings disposed within the paramagnetic housing, andat least one ferromagnetic element disposed within the open-air gap, wherein the paramagnetic housing and the ferromagnetic element are constructed and arranged to direct the magnetic field in the particular angular direction across the open-air gap, anda plurality of RF tone detectors electromagnetically coupled with the transmitter-initiator magnetic flux antenna,a transmitter-initiator microcontroller electromagnetically coupled with the plurality of RF tone detectors, the transmitter-initiator microcontroller demodulating communication from the receiver responder and controlling communication to the receiver responder, anda plurality of RF burst generators electrically coupled with the transmitter-initiator microcontroller and with the transmitter-initiator magnetic flux antenna;

    wherein the system wirelessly communicates between the transmitter initiator and the at least one receiver responder disposed in the specific angular region via near-field magnetic induction across the open-air gap; and

    wherein the microcontroller of the receiver responder demodulates communication from the transmitter initiator and controls communication to the transmitter initiator.

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