标签密集环境下天线互偶效应研究

佐磊; 何怡刚; 李兵; 朱彦卿; 方葛丰

doi:10.7498/aps.62.044102

摘要

基于射频识别技术原理及Friis传输方程, 导出了无源超高频射频识别系统链路模型, 结合二端口网络分析方法, 导出了标签密集环境下的标签天线互阻抗计算表达式.利用单阅读器单标签时的标签阻抗匹配条件, 基于功率传输系数及调制因子, 分析了互偶效应对系统链路的影响.在开阔室内环境中, 测试了双标签及标签单、双平面布置情形下的阅读器天线最小发射功率及系统识别率.测试结果表明, 双标签及双平面情形下, 阅读器天线最小发射功率变化率分别为(-7%, 11.6%)及(-10%, 12.5%).

关键词:

Abstract

The close displacement of ultra high frequency radio-frequency identification (UHF RFID) tags can be considered as an electromagnetically interconnected system which causes the mutual coupling effect among antennas of tags, thereby resulting in change in impedance matching condition. Based on the principles of RFID technology and Friis propagation equation, a link budget model of UHF RFID is provided which consists of one reader and one tag. Expressions of mutual impedance in dense environments are derived by using a two-port network. Utilizing the parameters of power transmission coefficient and modulation factor, the variation of system performance is discussed in theory and tested by three experiments which are conducted in open indoor environment. The measurement results show that the change rate of minimum power transmitted by the reader antenna is in a range from -7% to 11.6% for two-tag scene and from -10% to 12.5% for two-plane arrangement.

Keywords:

作者及机构信息

1.
湖南大学电气与信息工程学院, 长沙 410082;

2.
合肥工业大学电气与自动化工程学院, 合肥 230009;

3.
电子测试技术国防科技重点实验室, 青岛 266555

基金项目: 国家杰出青年基金(批准号:50925727)、国家自然科学基金(批准号:60876022)、国家自然科学基金青年科学基金(批准号:51107034)、国防预研重大项目(批准号:C1120110004)、湖南省科技计划(批准号:2011J4,2011JK2023)、湖南省自然科学基金(批准号:12JJA004)和湖南省教育厅科学研究项目(批准号:11C0479)资助的课题.

Authors and contacts

1.
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;

2.
School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China;

3.
The 41st Research Institute of China Electronics Technology Group Corporation, Qingdao 266555, China

Funds: Project supported by the National Natural Science Foundation for Distinguished Young Scholars of China (Grant No. 50925727), the National Natural Science Foundation of China (Grant No. 60876022), the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 51107034), the National Defense Advanced Research Project of China (Grant No. C1120110004), the Natural Science Foundation of Hunan Province, China (Grant No. 12JJA004), and the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 11C0479).

参考文献

[1]	Marrocco G 2011 Proc. IEEE Trans. Antennas Propag. 59 1019
[2]	Nikitin P V, Rao K V S 2006 Proc. IEEE Trans. Antennas Propag. 48 212
[3]	Tang Z J, He Y G 2009 Acta Phys. Sin. 58 5126 (in Chinese) [唐志军, 何怡刚 2009 58 5126]
[4]	Hou Z G, He Y G, Li B, She K, Zhu Y Q 2010 Acta Phys. Sin. 59 5606 (in Chinese) [侯周国, 何怡刚, 李兵, 佘开, 朱彦卿 2010 59 5606]
[5]	Li B, He Y G, Hou Z G, She K, Zuo L 2011 Acta Phys. Sin. 60 084202 (in Chinese) [李兵, 何怡刚, 侯周国, 佘开, 佐磊 2011 60 084202]
[6]	Baker H, LaGrone A H 1962 IEEE IRE Trans. Antennas Propag. 10 172
[7]	Alexopoulos N G, Rana I E 1981 Proc. IEEE Trans. Antennas Propag. 29 106
[8]	Weigand S M, Dobkin D M 2006 Proc. IEEE Trans. Antennas Propag. Society Int. Symp. Albuquerque, USA July 9-14, 2006 p1027
[9]	Nikitin P V, Rao K V S 2009 IEEE Trans. Ind. Electron. 56 2374
[10]	Dobkin D M 2007 The RF in RFID: Passive UHF RFID in Practice (Burlington: Elsevier) p305
[11]	Balanis C A 2005 Antenna Theory, Analysis and Design (3rd Ed.) (Hoboken: Wiley) p468
[12]	Lu F, Chen X S, Ye T T 2009 2009 IEEE International Conference on RFID, Orlando, USA, April 27-28, 2009 p330

施引文献

[1]	Marrocco G 2011 Proc. IEEE Trans. Antennas Propag. 59 1019
[2]	Nikitin P V, Rao K V S 2006 Proc. IEEE Trans. Antennas Propag. 48 212
[3]	Tang Z J, He Y G 2009 Acta Phys. Sin. 58 5126 (in Chinese) [唐志军, 何怡刚 2009 58 5126]
[4]	Hou Z G, He Y G, Li B, She K, Zhu Y Q 2010 Acta Phys. Sin. 59 5606 (in Chinese) [侯周国, 何怡刚, 李兵, 佘开, 朱彦卿 2010 59 5606]
[5]	Li B, He Y G, Hou Z G, She K, Zuo L 2011 Acta Phys. Sin. 60 084202 (in Chinese) [李兵, 何怡刚, 侯周国, 佘开, 佐磊 2011 60 084202]
[6]	Baker H, LaGrone A H 1962 IEEE IRE Trans. Antennas Propag. 10 172
[7]	Alexopoulos N G, Rana I E 1981 Proc. IEEE Trans. Antennas Propag. 29 106
[8]	Weigand S M, Dobkin D M 2006 Proc. IEEE Trans. Antennas Propag. Society Int. Symp. Albuquerque, USA July 9-14, 2006 p1027
[9]	Nikitin P V, Rao K V S 2009 IEEE Trans. Ind. Electron. 56 2374
[10]	Dobkin D M 2007 The RF in RFID: Passive UHF RFID in Practice (Burlington: Elsevier) p305
[11]	Balanis C A 2005 Antenna Theory, Analysis and Design (3rd Ed.) (Hoboken: Wiley) p468
[12]	Lu F, Chen X S, Ye T T 2009 2009 IEEE International Conference on RFID, Orlando, USA, April 27-28, 2009 p330

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