Proximity Effects of Metallic Environments on High Frequency RFID Reader Antenna: Study and Applications
Proximity Effects of Metallic Environments on High Frequency RFID Reader Antenna: Study and Applications
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DOI：
10.1109/tap.2007.908575
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发表时间：
2007-11
影响因子：
5.7
通讯作者：
X. Qing;Zhi Ning Chen
中科院分区：
文献类型：
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作者：
X. Qing;Zhi Ning Chen
研究了金属环境对13.56 MHz高频射频识别(RFID)阅读器天线性能的影响。实验研究了典型高频RFID读写器环天线在不同金属板结构附近的谐振频率、场强和场分布。研究表明，金属板的存在使天线的谐振频率升高，场强减弱。邻近效应强烈地依赖于金属板的大小、板与天线之间的距离以及板的方向。这种影响极大地降低了射频识别系统的读出范围，制约了高频射频识别系统的共存。缓解影响的一个解决方案是根据研究获得的信息，在接近金属物体的地方重新调整或共同设计阅读器天线。作为例子，环状天线与金属板共同设计以构成金属背板环状天线，并针对RFID智能货架系统进行了优化以抑制干扰，提高检测精度。
We study the proximity effects of metallic environments on the performance of high frequency (HF) radio frequency identification (RFID) reader antenna operating at 13.56 MHz. The performance of a typical HF RFID reader loop antenna in the proximity of various metal plate configurations is experimentally investigated in terms of resonant frequency, field intensity, and field distribution. The study shows that the presence of the metal plates shifts up the resonant frequency of the antenna and weakens its field intensity. The proximity effects are strongly dependent on the size of the metal plate, distance between the plate and the antenna as well as the orientation of the plate. Such effects greatly degrade the reading range and restrict the co-existence of HF RFID systems. A solution to alleviate the effects is to re-tune or co-design the reader antenna in proximity with the metallic objects based on the information from the study. As an example, a loop antenna is co-designed with a metal plate to configure a metal-backed loop antenna, and optimized for an RFID smart shelf system to restrain the interference and enhance the detection accuracy.