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Received: 2008-06-28

Revision Accepted: 2008-09-08

Crosschecked: 2009-06-10

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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.8 P.1217-1222


Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces

Author(s):  Ling-fei MO, Hong-jian ZHANG, Hong-liang ZHOU

Affiliation(s):  State Key Lab of Industrial Control Technology, Department of Control, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   lfmo@iipc.zju.edu.cn

Key Words:  Radio frequency identification (RFID), Tag, Metallic surface, Finite element method (FEM), Method of moment (MoM)

Ling-fei MO, Hong-jian ZHANG, Hong-liang ZHOU. Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces[J]. Journal of Zhejiang University Science A, 2009, 10(8): 1217-1222.

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%DOI 10.1631/jzus.A0820495

T1 - Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces
A1 - Ling-fei MO
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A1 - Hong-liang ZHOU
J0 - Journal of Zhejiang University Science A
VL - 10
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0820495

It is a challenge for passive RFID tags to be mounted on the surface of metal because the parameters of tag antennas, such as the impedance matching, the radiation efficiency and the radiation pattern, are seriously affected by the metallic surface. This paper presents the characteristics of the dipole-like antennas of ultra high frequency (UHF) radio frequency identification (RFID) tags that are placed close to metallic surfaces. The finite element method (FEM) and method of moment (MoM) were used to simulate the changes of the antenna parameters near the metallic surface. Two typical dipole-like antennas close to the metallic surface, a closed loop antenna and a loaded meander antenna, were modeled, and the performance was evaluated. Experiment was carried out and the results were in good agreement with the simulation, showing that a distance of 0.05λ~0.1λ (λ is the free space wavelength) from the metallic surface could make the dipole-like UHF RFID tag performance be acceptable.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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