A chipless RFID sensor system for cyber centric monitoring applications

Sudhir Shrestha, Mercyma Balachandran, Mangilal Agarwal, Vir V. Phoha, Kody Varahramyan

Research output: Contribution to journalArticlepeer-review

128 Scopus citations


A chipless RF identifiction (RFID) sensor system platform consisting of passive chipless RFID sensor tags and specialized reader has been developed for cyber centric monitoring applications. The sensor tags are fabricated on a flexible substrate, and the tag identification (ID) generation circuit consists of microstrip transmission lines. Two tag configurations are presented. The first configuration (conf-I) consists of an antenna and an integrated sensor. The second configuration (conf-II) consists of an antenna, ID generation circuit, and a sensor. The specialized reader system, consisting of an analog reader section and an on-board computer system, communicates with the sensor tags using load modulated backscattered communication techniques, at 915-MHz carrier signal. The reader, receiving the ID code generated by a tag, constructs it into a standardized RFID data frame, suitable for cyberspace information exchange. The developed system has been tested for wireless monitoring of ethylene gas. Using a conf-I tag, demodulated voltage change of 3.05 mV is observed at the reader, when the ethylene gas concentration changes from 0 to 100 ppm. The presented conf-II tag prototype allows generation of eight different ID codes and an average of 26.51°/pF phase change in the backscattered signal, when the load capacitance (sensor) of the tag changes between 1-5 pF.

Original languageEnglish (US)
Article number4806180
Pages (from-to)1303-1309
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
StatePublished - May 2009
Externally publishedYes


  • Chipless RF identification (RFID) sensor system
  • Cyber centric monitoring
  • Passive tags
  • RFID reader
  • Transmission line identification (ID) generation

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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