超高频射频识别近场系统互耦效应中频率偏移研究

何怡刚; 佘培亮; 佐磊; 张超群

doi:10.11999/JEIT180375

超高频射频识别近场系统互耦效应中频率偏移研究

doi: 10.11999/JEIT180375

合肥工业大学电气与自动化工程学院合肥 230000

基金项目: 国家自然科学基金(51577046, 51637004)，国家重点研发计划(2016YFF0102200)

详细信息

作者简介:
何怡刚：男，1966年生，教授，博士生导师，研究方向为射频识别技术、高速低压低耗集成电路、物联网技术、混合信号电路与系统测试与诊断等

佘培亮：男，1993年生，硕士生，研究方向为射频识别技术和标签集成电路设计与测试等

佐磊：男，1982年生，副教授，硕士生导师，研究方向为射频识别技术、物联网技术、信号处理及智能电网等

张超群：女，1994年生，硕士生，研究方向为射频识别技术和物联网技术等

通讯作者:
何怡刚　18655136887@163.com

中图分类号: TN801; TP391.45
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出版历程
- 收稿日期: 2018-04-24
- 修回日期: 2018-09-10
- 网络出版日期: 2018-09-21
- 刊出日期: 2019-03-01

Study on Frequency Shift in Mutual Coupling Effect of Ultra-high-frequency Radio Frequency IDentification Near-field System

School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230000, China

Funds: The National Natural Science Foundation of China (51577046, 51637004), The National Key Research and Development Plan (2016YFF0102200)

摘要

摘要:
在超高频射频识别(UHF RFID)系统近场(NF)密集标签应用中，由于微带标签天线的结构特点，传统线圈间互阻抗表达式在预估系统频率偏移等互耦效应问题方面误差较大，精确性不够。首先，基于变压器模型，从无线电能传输的角度推导了近场密集标签间的互阻抗表达式。然后，结合近场电感耦合型标签，通过建立电磁仿真模型间接获取有关电气参数值。最后，验证推导公式并从影响双标签间互阻抗的环境因素角度去研究UHF RFID近场频率偏移问题。测试结果表明，当标签间距小于30 mm时，推导的互阻抗表达式应用于频率偏移计算误差范围为1.6～7.3 MHz。研究结果为基于标签间互阻抗预估UHF RFID近场标签间的互耦效应问题提供了参考依据。
- 超高频近场 /
- 互耦效应 /
- 频率偏移 /
- 变压器模型 /
- 互阻抗
Abstract:
In Near-Field (NF) applications of Ultra-High-Frequency Radio Frequency IDentification (UHF RFID) systems, due to the structural characteristics of the microstrip tag, the traditional inter-coil mutual impedance expression has a large error in the estimation of the mutual coupling effect such as the frequency shift of the prediction system, and the accuracy is not enough. Firstly, based on the transformer model, the mutual impedance expressions of the NF dense tags are derived from the perspective of radio energy transmission. Then, the electrical parameter values are obtained indirectly by establishing the electromagnetic simulation model combining with the NF inductance coupling tag. Finally, the derivation formula is verified and UHF RFID NF frequency shift is studied from the perspective of environmental factors that affect the mutual impedance between the two tags. The test results show that the derived mutual impedance expression is applied to the frequency offset calculation with error range in 1.6～7.3 MHz when the tags’ spacing is less than 30 mm. The results provide a reference for studying the mutual coupling effect between UHF RFID NF tags based on the mutual impedance between tags.
- Near-Field of Ultra-High-Frequency(UHF NF) /
- Mutual coupling effect /
- Frequency shift /
- Transformer model /
- Mutual impedance

HTML全文

图 1 UHF RFID近场磁场耦合电路模型

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图 2 双标签互耦等效二端口网络

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图 3 双标签电感耦合等效电路

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图 4 标签

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图 5 标签J41的回波损耗性能

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图 6 HFSS下的双标签互耦仿真模型图

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图 8 双标签布放不同时耦合系数与距离的关系

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图 7 标签间插入损耗曲线图(垂直叠放)

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图 9 不同距离下的标签间互阻抗仿真值

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图 10 标签间的互阻抗虚部理论值与仿真值对比

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图 11 标签1受到互耦时的工作频率偏移

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图 12 实验布置示意图

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图 13 $ Δf$ 随d₁₂及$\theta$的变化图

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图 14 $ Δf$ 随标签间相对位置的变化

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图 15 $ Δf$ 随 ${\cal E}_ {\rm{r}}$的变化($\theta={0^ \circ }$)

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表 1 标签模型参数(mm)

参数名称 $h$ ${r_0}$ ${r_1}$ ${r_2}$ ${a_1}$ ${a_2}$ $l$

数值 0.05 8.00 5.90 5.20 $2\sqrt 2 $ $2\sqrt 2 - 1.4$0 4.20

下载: 导出CSV

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