计算机工程

• 开发研究与工程应用 • 上一篇    

高频RFID重叠标签载波变频读写器设计

(复旦大学信息科学与工程学院,上海 200433)   

  1. (复旦大学信息科学与工程学院,上海 200433)
  • 收稿日期:2012-11-13 出版日期:2014-02-15 发布日期:2014-02-13
  • 作者简介:徐计荣(1988-),男,硕士研究生,主研方向:物联网基础架构,射频识别技术;钱松荣,教授

Variable Frequency Carrier Reader Design for High Frequency RFID Stacked Tags

(School of Information Science and Engineering, Fudan University, Shanghai 200433, China)   

  1. (School of Information Science and Engineering, Fudan University, Shanghai 200433, China)
  • Received:2012-11-13 Online:2014-02-15 Published:2014-02-13

摘要: 在高频射频识别技术的实际应用中,当多张标签紧密重叠在一起时,重叠标签的谐振频率会产生偏移,造成标签无法获取足够能量,导致标签无法读写。针对该问题,从理论角度建立并分析重叠标签的电磁场耦合模型,从本质上分析无法读写的原因,提出一种新的读写器设计方案,采用载波变频的方式匹配重叠标签偏移的谐振频率,并通过实验验证其可行性。实验结果表明,在相同功率及读写距离的情况下,与标准读写器相比,该设计方案能明显提高重叠标签的读写成功率。

关键词: 高频射频识别, 重叠标签, 谐振频率偏移, 载波变频, 读写器设计

Abstract: In practice of High Frequency(HF) Radio Frequency Identification(RFID) implementation, it is very hard to read multiple tags which are closely stacked because of insufficient energy scavenging caused by resonance frequency shifting. In order to solve this stacked tags problem, theoretical analysis of the stacked-multi-tags model is conducted and a novel variable frequency carrier method is proposed to match the shifted stacked tags’ resonance frequency. Experimental results show significant performance improvement compared with standard HF RFID reader in the condition of same radio frequency power and reading distance.

Key words: High Frequency(HF) Radio Frequency Identification(RFID), stacked tag, resonance frequency shifting, carrier frequency, reader design

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