金属介质对超高频RFID被动标签读取效能的 影响及可用于金属表面标签的设计

 金属介质对射频信号的干扰一直以来影响着射频识别技术（RFID）的有效应用。为了研究导致干扰发生的机理以及解决办法，以超高频段RFID系统为对象，依据电磁场相关理论，进行了一系列实验。通过对实验所得数据的分析，验证了金属介质对RFID被动标签读取率的影响，并进一步发现标签和金属介质表面间隔距离与读取率之间的变化关系。另外，发现了附加金属层产生的同相位电场对标签读取性能的放大作用。最后，根据实验研究结果，提出一种可用于金属表面的RFID被动标签的设计方案，该设计方案不但可以有效消除金属干扰的负面影响，还可在原有读取性能的基础上进一步提高读取率，同时兼顾使用方便性和制造成本两方面。

Research on impact of metal media on RFID passive tag and design method of metal-surface-usable RFID tag

Disturbance of metal media on radio frequency signal is always influencing the effective application of RFID.To explore the principle of triggering this disturbance and the methods to solve this problem,by taking UHF RFID system as a target,according to relevant theory of electromagnetic field,a series of experiments are designed.Through analysis of data gained from experiments,impact of metal media on RFID passive tag readability is verified.Furthermore,relationship between distance from tag to metal media surface and readability is discovered.Moreover,the magnifying effect of an extra metal layer to readability is found too.Finally,according to the results of experiments,a design plan which can be used on RFID passive tag on metal surface is proposed.This plan can not only eliminate negative effect of metal disturbance,but enhance readability,which considers the convenience for use and manufacture cost as well.