标签分布疏密状态变化情形下超高频天线设计方法研究  

Research on the Design Method of UHF Antenna under the Condition of Changing Tag Distribution Density

作　　者：佐磊[1,2] 曹雪兵 朱良帅 丁雨晴 孙梦婷 ZUO Lei;CAO Xuebing;ZHU Liangshuai;DING Yuqing;SUN Mengting(Institute of Electrical and Automation Engineering,Hefei University of Technology,Hefei 230009,China;National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]合肥工业大学可再生能源接入电网技术国家地方联合工程实验室,合肥230009

出　　处：《电子与信息学报》2023年第1期158-167,共10页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61971175,51777050)。

摘　　要：针对标签分布疏密程度的变化会导致其天线与负载的阻抗匹配关系改变进而影响系统性能的问题。该文结合电磁波传播理论和射频识别(RFID)工作原理,导出了标签分别处于稀疏和密集分布状态下的RFID系统通信链路模型;结合变压器模型和二端口网络分析方法,推导了标签密集分布状态时标签天线的互阻抗表达式;利用功率传输系数和反向散射调制因子,分析了标签分布疏密程度对RFID系统性能的影响;基于加载条匹配原理,提出一种适用于分布疏密状态变化情形的标签天线优化设计方法。仿真实验和实际测量结果表明,标签密集分布时,改进标签的性能较原型标签提升16%;标签稀疏分布时,改进标签的性能达到原型标签的96%。In view of the problem that the change of the density of the label distribution will lead to the change of the impedance matching relationship between the antenna and the load, and then affect the system performance. Based on the theory of electromagnetic wave propagation and the working principle of Radio Frequency IDentification(RFID), the communication link models of RFID system with sparse and dense tags are derived. Based on the transformer model and the two-port network analysis method, the mutual impedance expression of the tag antenna in the dense distribution state is derived. Using power transmission coefficient and backscattering modulation factor, the influence of tag density on RFID system performance is analyzed.Based on the principle of loading bar matching, an optimal design method for label antenna is proposed.Simulation and actual measurement results show that the performance of the improved tag is 16% higher than that of the prototype tag when the tags are densely distributed. When the tags are sparsely distributed, the performance of the improved tags reaches 96% of that of the prototype tags.

关 键 词：天线 天线设计 射频识别 分布状态 耦合效应 

分 类 号：TN828[电子电信—信息与通信工程] TP391.45[自动化与计算机技术—计算机应用技术]