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Gas cylinder and RFID transponder assemblies and related methods having fixed transponder orientations

  • US 8,618,938 B2
  • Filed: 11/21/2011
  • Issued: 12/31/2013
  • Est. Priority Date: 11/21/2011
  • Status: Active Grant
First Claim
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1. An assembly for fixed orientation of an RFID (radio frequency identification) transponder with respect to a gas cylinder, comprising:

  • a gas cylinder configured to store a gas, the gas cylinder having a central opening on its top surface;

    a valve flange coupled within the central opening of the gas cylinder, the valve flange having a primary valve opening;

    a metal plate having a bottom surface coupled to the gas cylinder, the metal plate having a recess formed within the bottom surface and configured to house an RFID transponder and to fix an orientation of the RFID transponder with respect to the primary valve opening; and

    an RFID transponder located within the recess of the metal plate, the RFID transponder having an elongated ferrite core antenna including a wire wrapped around a ferrite core and further having a volume of about 100 cubic millimeters or less;

    wherein the RFID transponder is configured to communicate with an external reader using phase shift keying (PSK) modulation; and

    wherein the elongated ferrite core antenna of the RFID transponder within the recess has a fixed orientation such that a line passing through a center of the elongated ferrite core antenna is offset by 40 degrees or less from a line passing through a center axis of the valve flange and the RFID transponder.

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