Acta Metallurgica Sinica(English letters) ›› 2015, Vol. 22 ›› Issue (5): 49-55.doi: 10.1016/S1005-8885(15)60680-X

• Wireless • Previous Articles     Next Articles

Electromagnetic effects of nearby NaCl solution on RFID tags based on dynamic measurement system


  1. 1. Jiangsu Institute of Standardization, Nanjing 210029, China 2. School of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 21003, China
  • Received:2014-12-12 Revised:2015-03-24 Online:2015-10-30 Published:2015-10-30
  • Supported by:
    This work was supported by National Natural Science Foundation of China (61475071); Jiangsu Natural Science Foundation (BK20141032); the China Postdoctoral Science Foundation (2013M531363); the Postdoctoral Science Foundation of Jiangsu Province (1202020C); the Science and Technology Project of General Administration of Quality Supervision, Inspection and Quarantine of China (2013QK194); the Science and Technology Project of Quality and Technical Supervision of Jiangsu Province (KJ133818).

Abstract: We have studied the effects of nearby NaCl solution on the performance of ultra high frequency (UHF) radio frequency identification (RFID) tags, using simulations and measurements. The main reason for the decrease of read range in proximity to NaCl solution is the antenna gain penalty. The boundary conditions near the surface reduce antenna efficiency and antenna gain. With the conductivity of the NaCl solution increasing, the read range of the RFID system decreases. A theoretical formula is proposed for the read range to calculate the material losses of tag antenna. The formula establishes relationship between conductivity and read range of RFID system. The maximum read range is also calculated theoretically with simulation software. In addition, we develop an experimental measurement technique to certify the feasibility of the derived formula, which involves a dynamic measurement system. Consequently, the experimental results are found to be in good agreement with theoretical data.

Key words: radio frequency identification (RFID), read range, NaCl solution, gain penalty, conductivity

CLC Number: