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Radio frequency data communications device with adjustable receiver sensitivity and method

  • US 6,781,508 B2
  • Filed: 12/09/2002
  • Issued: 08/24/2004
  • Est. Priority Date: 07/30/1996
  • Status: Expired due to Fees
First Claim
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1. A method of manufacturing a radio frequency data communications device, for use with a remote interrogator unit, the method comprising:

  • providing an RFID integrated circuit, including a package housing transponder circuitry, and supporting the integrated circuit on a substrate, the integrated circuit being configured to transmit, in response to an interrogation signal from a remote interrogator, a responsive signal which includes identification information;

    securing an antenna on the substrate external of the transponder circuitry and electrically coupling the antenna to the integrated circuit, the antenna having a length, and a width transverse to the length;

    purposefully reducing the sensitivity of the transponder circuitry of the integrated circuit by trimming the antenna to reduce the width of at least a portion of a section at a location along the length of the antenna, while the antenna is on the substrate; and

    supporting a battery from the substrate and coupling the battery to the integrated circuit, wherein reducing the sensitivity of the transponder circuitry comprises setting a range of twenty feet for the transponder circuitry, increasing duration of an interval during which the transponder circuitry is not able to detect a wake-up signal and conserving battery power.

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