Self-interference cancelation in frequency-domain chipless RFID readers

Mohammadali Forouzandeh, Nemai Karmakar

Research output: Contribution to journalArticleResearchpeer-review

42 Citations (Scopus)


Frequency-domain chipless RFID readers hold tremendous promise as a low-cost solution for mass production of this technology. However, the strong self-jamming signal leakage, from the transmitter to the receiver, significantly degrades the sensitivity of the reader. As a result, the maximum reading range of the system is diminished. To address this issue, we studied the sources of interference signals in the system and proposed a method to significantly reduce them. An ultrawideband compensator, over the wide frequency range of 4.3 to 7.3 GHz, was designed and implemented. This method realized an interference isolation better than 40, 55, and 55 dB in single-Antenna, dual-polarized antenna, and two-Antenna readers, respectively. A noticeable 25-dB excessive isolation to that of the conventional architecture which should help to bring this technology closer to commercial adoption.

Original languageEnglish
Article number8624369
Pages (from-to)1994-2009
Number of pages16
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
Publication statusPublished - 1 May 2019


  • Chipless radio frequency identification (RFID)
  • RFID reader
  • self-interference compensation

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