Patent · US Active

Detecting RFID tag and inhibiting skimming

US9000892B2 · kind B2 · utility

10Cited by
5References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 31, 2011
Grant dateApr 7, 2015
Priority date
Expiry dateOct 20, 2033

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04K2203/20
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

A method of detecting an RFID tag includes transmitting a bait RFID read signal at a bait power level and a simulated response signal at a simulated-response power level. A selected reader frequency is monitored for a selected detection time. A skimmer is determined to be present if a skimmer RFID read signal is detected during that time. If a skimmer is not determined to be present, multiple read signals are transmitted sequentially, each signal at a respective read power level. At least one of the read power levels is lower than the bait power level, at least one of the read power levels is lower than the simulated-response power level, and at least two of the read power levels are different from each other. A selected response frequency for a tag is monitored for a response from an RFID tag.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.