线性阵列分布RFID系统性能建模方法研究  

Research on RFID system performance modeling method under linear array distribution

作　　者：佐磊[1,2] 张一卓 孔维业 雷碧航 丁雨晴 Zuo Lei;Zhang Yizhuo;Kong Weiye;Lei Bihang;Ding Yuqing(School of Electrical Engineering and Automation,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]可再生能源接入电网技术国家地方联合工程实验室(合肥工业大学),合肥230009

出　　处：《电子测量与仪器学报》2025年第1期176-186,共11页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(61971175)项目资助。

摘　　要：标签间互耦效应对不同位置标签的作用效果不同,使得线性阵列分布RFID系统的整体性能随标签间距与数量的改变呈现非线性变化。鉴于此,基于RFID工作原理与电磁波传播理论,推导了多标签RFID系统中标签互阻抗及功率传输系数的表达式;利用功率传输系数,分析了标签线性等距分布情形下,互耦效应对不同位置标签及系统整体性能的影响,并建立了系统最小功率传输系数随标签间距与标签数量变化的数学模型;在开阔室内环境中,测试了标签间距和数量变化时的应答信号功率。理论分析与实验结果表明,线性等距分布时,标签的功率传输系数与间距呈非线性关系;互耦效应对标签的影响程度以工作波长为周期逐步减小,在间距为波长倍数时取得极大值;最小功率传输系数出现的位置随着间距的增大在中心与外侧之间以波长为周期波动;系统性能测试结果与所建立模型的变化规律保持一致。To address the problem that the mutual coupling effect between tags has different effects on tags at different positions,which makes the overall performance of the linear array distributed RFID system show nonlinear changes with the change of tag spacing and number.The method involves that based on the working principle of RFID and the theory of electromagnetic wave propagation,the expressions of the mutual impedance and power transmission coefficient of tags in the multi-tag RFID system are derived.Using power transmission coefficient,the influence of mutual coupling effect the tags at different positions and the overall performance of the system in the case of linear equidistant distribution of tags is analyzed.A mathematical model of the system's minimum power transmission coefficient changing with the tag spacing and the number of tags is established.In an open indoor environment,the response signal power is tested when the tag spacing and number change.Theoretical analysis and experimental results show that when the tags are linearly equidistantly distributed,the power transmission coefficient of the tags is nonlinearly related to the spacing.The influence of the mutual coupling effect on the tags no longer decreases monotonically with the increase of distance,but gradually decreases with the wavelength as the period,and reaches the maximum value when the spacing is a multiple of the wavelength.The location of the system's minimum power transmission coefficient fluctuates between the center and the outside with a wavelength as the spacing increases.The test results of system performance are consistent with the change pattern of the established model.

关 键 词：射频识别 互耦效应 互阻抗 多标签RFID系统 线性阵列分布 

分 类 号：TN821.4[电子电信—信息与通信工程]