Improving backscatter radio tag efficiency

Aggelos Bletsas, Antonis G. Dimitriou, John N. Sahalos

Research output: Contribution to journalArticlepeer-review


This paper studies tag properties for optimized tag-to-reader backscatter communication. The latter is exploited in RF identification (RFID) systems and utilizes binary reflection coefficient change of the tag antenna-load circuit. It is shown that amplitude maximization of complex reflection coefficient difference between the two states is not sufficient for optimized tag-to-reader backscatter communication, contrary to what is commonly believed in the field. We provide a general tag load selection methodology that applies to any tag antenna, including minimum scattering antennas as a special case. The method is based on tag antenna structural mode closed-form calculation (given three values of tag radar cross section), employs simple antenna/communication theory, and applies to both passive, as well as semipassive RFID tags.

Original languageEnglish
Article number5458048
Pages (from-to)1502-1509
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
Publication statusPublished - Jun 2010


  • Minimum scattering
  • Receiver sensitivity
  • RF identification (RFID)
  • Structural mode


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