×

Chemical and biological sensors, systems and methods based on radio frequency identification

  • US 8,318,099 B2
  • Filed: 10/26/2005
  • Issued: 11/27/2012
  • Est. Priority Date: 10/26/2005
  • Status: Active Grant
First Claim
Patent Images

1. A detection system utilizing at least one radiofrequency identification (RFID) tag, comprising:

  • an RFID tag comprising;

    a substrate;

    an antenna is disposed on said substrate;

    a sensor material disposed adjacent to at least a portion of the antenna and the sensor material being selected to be sensitive to one of chemical or biological environment; and

    a reader for receiving and processing signals from said RFID tag, wherein said reader is configured to measure a signal in the form of a complex impedance from said RFID tag wherein said signal comprises a plurality of frequency shifts and changes in magnitude of the and imaginary parts of the complex impedance to provide position independent responses from said RFID tag;

    wherein said frequency shifts comprise a frequency shift of the maximum of the imaginary part of the complex impedance (F1 shift), a frequency shift of the minimum of the imaginary part of the complex impedance (F2 shift), a frequency shift of the maximum part of the complex impedance (Fp), and changes in magnitude of the real part of the complex impedance (Zp); and

    ,wherein said complex impedance related to a nature and a concentration of analyte species is derived from multivariate analysis.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×