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Radio frequency data communications device with adjustable receiver sensitivity and method

  • US 6,509,837 B1
  • Filed: 09/21/2001
  • Issued: 01/21/2003
  • Est. Priority Date: 07/30/1996
  • Status: Expired due to Term
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 first transponder circuitry on a sheet substrate;

    first printing a first microstrip antenna on the sheet substrate, external of the first transponder circuitry, and electrically coupling the first microstrip antenna to the first transponder circuitry;

    providing a first battery on the sheet substrate and electrically coupling the first battery to the first transponder circuitry; and

    laser trimming the first microstrip antenna by a first amount, to effect a first sensitivity; and

    providing second transponder circuitry on a second sheet substrate;

    second printing a second microstrip antenna on the second sheet substrate, external of the second transponder circuitry, and electrically coupling the second microstrip antenna to the second transponder circuitry;

    providing a second battery on the second sheet substrate and electrically coupling the second battery to the second transponder circuitry; and

    laser trimming the second microstrip antenna by an amount different from the first amount to effect a second sensitivity different from the first sensitivity.

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