A Practical Guide to Optimal Impedance Matching for UHF RFID Chip

IF 2.3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE journal of radio frequency identification Pub Date : 2024-02-19 DOI:10.1109/JRFID.2024.3367452
Nicolas Barbot;Ionela Prodan;Pavel Nikitin
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Abstract

This paper shows that the classical conjugate impedance matching used in the UHF RFID is not optimal anymore with new chips that have high sensitivity. The optimal matching allowing to maximize the read range of an RFID system (reader and tag) is introduced. The principle relies on finding the optimal trade-off between the power received by the tag and the modulated power backscattered to the reader. This matching depends on both tag and reader parameters. The proposed method is optimal and can be applied to any tag (passive and semi-passive). Compared to classical conjugate impedance matching, we show that this new approach can increase the read range by 22% and 8% in two examples: for a semi-passive tag based on Monza X8-K Dura chip and a passive tag based on Monza R6-P chip, respectively. Finally, a practical guide is proposed for antenna designers to optimize the matching in practical applications.
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超高频 RFID 芯片最佳阻抗匹配实用指南
本文表明,超高频射频识别(UHF RFID)中使用的经典共轭阻抗匹配对于具有高灵敏度的新型芯片来说已不再是最佳匹配。本文介绍了可最大化 RFID 系统(读取器和标签)读取范围的最佳匹配方法。其原理在于找到标签接收功率与读取器反向散射调制功率之间的最佳平衡点。这种匹配取决于标签和阅读器的参数。所提出的方法是最优的,可应用于任何标签(无源和半无源)。与传统的共轭阻抗匹配相比,我们在两个例子中展示了这种新方法能将读取范围分别提高 22% 和 8%:一个是基于 Monza X8-K Dura 芯片的半无源标签,另一个是基于 Monza R6-P 芯片的无源标签。最后,还为天线设计人员提出了在实际应用中优化匹配的实用指南。
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