Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces
Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces
复制标题
靠近金属表面的偶极子超高频 RFID 标签分析
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Hongliang Zhou
中科院分区：
文献类型：
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作者：
Lingfei Mo;Hongjian Zhang;Hongliang Zhou
由于金属表面对标签天线的阻抗匹配、辐射效率和辐射方向图等参数的影响很大，因此将无源RFID标签安装在金属表面是一个挑战。介绍了贴近金属表面的超高频射频识别(RFID)标签类偶极子天线的特性。利用有限元和矩量法对金属表面附近天线参数的变化进行了数值模拟。对两种典型的贴近金属表面的类偶极子天线--闭环天线和加载弯曲天线--进行了建模，并对其性能进行了评估。实验结果与仿真结果吻合较好，表明与金属表面的距离为0.0 5λ∼0.1λ(λ(自由空间波长)时，类偶极子超高频电子标签的性能是可以接受的。
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.