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IR Frequency Region: Fingerprint Region01:03

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Mixed orthogonal frequency coded SAW RFID tags.

Mark W Gallagher1, Donald C Malocha

  • 1Electrical Engineering and Computer Science Department, University of Central Florida, Orlando, FL, USA. mgallagher@knights.ucf.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 12, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces mixed orthogonal frequency coded (MOFC) surface acoustic wave (SAW) RFID tags. These advanced RFID sensors offer shorter response times and maintain code diversity for multi-sensor applications.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Surface Acoustic Wave (SAW) radio-frequency identification (RFID) tags are explored as passive multi-sensor platforms due to their robustness.
  • Existing Orthogonal Frequency Coded (OFC) SAW RFID tags face challenges with intersymbol interference and device length.
  • Research seeks improved SAW RFID embodiments for increased code capacity and reliability in harsh conditions.

Purpose of the Study:

  • To present a novel multi-track SAW configuration for shortening SAW response length.
  • To preserve code diversity and bandwidth in SAW RFID devices.
  • To introduce Mixed Orthogonal Frequency Coded (MOFC) SAW devices.

Main Methods:

  • Theoretical development of multi-track SAW configurations.
  • Fabrication of MOFC SAW sensors on YZ-LiNbO3 with 7% fractional bandwidth.
  • Experimental validation using a 915-MHz wireless correlator receiver system.

Main Results:

  • MOFC SAW devices demonstrate shorter response lengths while maintaining code diversity and bandwidth.
  • Experimental results show MOFC sensors provide good contrast to traditional OFC designs.
  • Simultaneous operation of eight wireless temperature sensors (four OFC, four MOFC) was achieved.

Conclusions:

  • The proposed multi-track SAW configuration effectively reduces response length in OFC RFID tags.
  • MOFC SAW devices offer a promising advancement for multi-sensor RFID platforms.
  • These devices show potential for simultaneous operation in complex wireless systems.