Change of read range for UHF passive RFID tags in close proximity
Change of read range for UHF passive RFID tags in close proximity
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更改近距离 UHF 无源 RFID 标签的读取范围
DOI：
10.1109/rfid.2009.4911202
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Kazunari Kodama
中科院分区：
文献类型：
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作者：
Yuto Tanaka;Y. Umeda;O. Takyu;M. Nakayama;Kazunari Kodama
在本文中，我们讨论了当一个标签靠近另一个标签时，UHF 无源 RFID 标签和阅读器之间的读取范围的变化。读取范围由前向链路和反向链路的强度决定，前向链路和反向链路的强度分别由标签和阅读器处的接收功率表示。标签的接近引起标签的天线之间的电磁干扰，并导致标签的天线和IC之间的阻抗匹配条件发生变化。阻抗匹配条件的这种变化会降低读取范围。因此，我们通过实验测量标签和读写器接收功率的变化，以确定是哪个环节限制了读取范围，限制了IC阻抗的存在范围。此外，还提出了一种在标签靠近时扩展读取范围的技术。
In this paper, we discuss change of read range between a UHF passive RFID tag and reader when a tag is close to another tag. The read range is determined by the strength of forward link and reverse link, which are represented by received power at a tag and reader, respectively. Approaching of tags causes electromagnetic interference between antennas of tags and results in change in impedance matching condition between an antenna and IC of a tag. This change in impedance matching condition decreases in read range. Therefore, we measure the change in received power of a tag and reader experimentally so as to identify which link limits read range and to restrict the existence range of IC impedance. In addition, a technique for extending read range when tags are close is proposed.