Evaluation of shielding materials for low frequency RFID systems

International Symposium on Electromagnetic Compatibility - EMC EUROPE Pub Date : 2012-12-31 DOI:10.1109/EMCEUROPE.2012.6396817

S. Wielandt, D. Mercy, N. Stevens, L. De Strycker, Jean-Pierre Goemaere

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引用次数: 8

Abstract

When RFID reader antennas are placed in a parallel line configuration, proper shielding is indispensable to prevent the readout of tags in a different line. However, placing electrically conductive or magnetically permeable shielding materials in the vicinity of a loop antenna influences the magnetic field strength and self inductance of the antenna, thus affecting the readout range. This paper evaluates the effects of different shieldings on the magnetic field strength, the readout range of an RFID tag and the self inductance of the antenna. The considered shieldings consist of copper or a combination of copper with a layer of highly or lowly permeable ferrite on top. First, the influences of these materials are compared to a free space setup in FEM simulations. These results are subsequently verified in an experimental setup. The configuration with a copper plate covered with a highly permeable ferrite layer increases the magnetic field strength, readout range and self inductance of the antenna, in contrast to the other configurations. Due to the efficient shielding, erroneous readout events of tags in a parallel line are suppressed.

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低频射频识别系统屏蔽材料的评价

当RFID阅读器天线放置在平行线配置时，适当的屏蔽是必不可少的，以防止在不同的线路上读取标签。然而，在环形天线附近放置导电或透磁屏蔽材料会影响天线的磁场强度和自感，从而影响读出范围。本文评估了不同屏蔽方式对射频识别标签的磁场强度、读取范围和天线自感的影响。所考虑的屏蔽由铜或铜的组合组成，顶部有一层高或低渗透性铁氧体。首先，将这些材料的影响与有限元模拟中的自由空间设置进行了比较。这些结果随后在实验装置中得到验证。与其他配置相比，铜板上覆盖高渗透性铁氧体层的配置增加了天线的磁场强度、读出范围和自感。由于有效的屏蔽，平行线上标签的错误读取事件被抑制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Symposium on Electromagnetic Compatibility - EMC EUROPE

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