Demonstration of improved passive UHF RFID coverage using optically-fed distributed multi-antenna system

Sithamparanathan Sabesan, Michael Crisp, Richard V. Penty, Ian H. White

Research output: Chapter in Book/Report/Conference proceedingConference contribution

19 Citations (Scopus)

Abstract

Optically-fed distributed antenna system (DAS) technology is combined with passive ultra high frequency (UHF) radio frequency identification (RFID). It is shown that RFID signals can be carried on directly modulated radio over fiber links without impacting their performance. It is also shown that a multi-antenna DAS can greatly reduce the number of nulls experienced by RFID in a complex radio environment, increasing the likelihood of successful tag detection. Consequently, optimization of the DAS reduces nulls further. We demonstrate RFID tag reading using a three antenna DAS system over a 20mx6m area, limited by building constraints, where 100% of the test points can be successfully read. The detected signal strength from the tag is also observed to increase by an average of approximately lOdB compared with a conventional switched multi-antenna RFID system. This improvement is achieved at +31dBm equivalent isotropically radiated power (EIRP) from all three antenna units (AUs).

Original languageEnglish
Title of host publication2009 IEEE International Conference on RFID, RFID 2009
Place of PublicationU. S. A.
PublisherIEEE
Pages217-224
Number of pages8
ISBN (Print)9781424433377
DOIs
Publication statusPublished - 25 Sep 2009
Event2009 IEEE International Conference on RFID, RFID 2009 - Orlando, FL, USA United States
Duration: 27 Apr 200928 Apr 2009

Conference

Conference2009 IEEE International Conference on RFID, RFID 2009
CountryUSA United States
CityOrlando, FL
Period27/04/0928/04/09

Keywords

  • Coverage
  • Distributed antenna system (DAS)
  • Nulls
  • Passive ultra high frequency (UHF) radio frequency identification (RFID)
  • Radio over fiber

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering

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