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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 897041, 8 pages
Research Article

Power Transmission of UHF Passive Embedded RFID in Tires

1Institute of Intelligent Information, Guizhou Normal University, Guiyang 550001, China
2Department of Guizhou Education, Center for RFID and WSN Engineering, Guiyang 550001, China
3Institute of New Technology, Guizhou Academy of Sciences, Guiyang 550001, China

Received 5 August 2013; Revised 28 December 2013; Accepted 30 December 2013; Published 17 February 2014

Academic Editor: Yuan Yao

Copyright © 2014 Shengbo Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


UHF passive RFID tags embedded in tires have a deep impact on tire life cycle management and tire monitoring. In this work, we present the power transmission of UHF passive embedded RFID in tires. In UHF passive embedded RFID systems in tires, the bidirectional radio link between reader and tags goes through air and tires. The total path loss contains reflection loss at tire-air boundaries and attenuation loss in the tires. The power transmission is based on the permittivity of tires and tire-air boundary conditions. We give an OCP method for measuring the permittivity of tires. By analyzing the radio link for UHF passive RFID, we establish a model of wave propagation of UHF embedded RFID in tires and make numerical analyses. Numerical analyses show that the error of the OCP methods for measuring the permittivity of tires is small, the parallel polarization and normal incidence of wave are chosen for improving the performance of the UHF embedded RFID in tires, and distance is chosen to keep power transmission function from locating valley.