Case 14851

FM TABS: Frequency Modifying RFID Tag Antenna Based Sensing


Radio Frequency Identification Device (RFID), sensor, tag antenna


Cold supply chain operations


Almost a third of perishables become damaged or destroyed during cold supply chain operations. This can be reduced by using better temperature sensors to monitor ambient temperature conditions.


This invention describes a sensor design that uses a shape memory polymer and a metal plate to convert temperature violations into a change of tag antenna properties. This single-use device is secure for audit trails as it cannot be reset once the temperature threshold is violated. The invention also describes a design and design methodology for an UHF RFID tag antenna that shifts its optimum operating frequency between 902 and 928 MHz band when a temperature threshold is exceeded.

  • Standardized communication protocols
  • Low cost tags
  • Adoption by major US retail companies as a track and trace solution

  • Professor Sanjay E. Sarma (Department of Mechanical Engineering, MIT)
  • Rahul Bhattacharyya (Department of Mechanical Engineering, MIT)
  • Christian Floerkemeier
  • Daniel Deavours

Intellectual Property:

US Provisional Patent 61/545925 filed 10/11/2011


Last revised: January 11, 2012

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