【作者】 张超；

【导师】 鄢志丹；

【作者基本信息】 中国石油大学(华东) ， 控制科学与工程， 2019， 硕士

【摘要】 RFID技术作为一种发展比较成熟的无线通信方式,在各领域得到了广泛应用。随着计算机技术与通信技术的发展及其物联网技术的进一步普及,RFID标签的使用场景也逐渐呈现出多样性,对标签的尺寸与环境适应性提出了更高的要求。在一些特殊情况下,为了保证标签不被损坏,需要将标签嵌入金属槽中进行使用。然而,由于金属环境的影响,导致了标签性能严重恶化,标签的最大读取距离明显下降,甚至根本无法识别。针对上述情况,本文主要研究了小型嵌入金属式标签的天线设计方法,深入分析了标签天线性能在金属槽中的变化规律,并通过一系列的仿真分析与实验测试加以验证。论文的工作内容主要包括以下几个部分:1)根据Friis传输方程和雷达距离方程详细推导了标签最大读取距离的理论计算公式,并深入分析了抗金属性标签的工作原理与相关设计方法。基于电磁波传输理论与天线理论,借助电磁仿真软件对偶极子天线和微带天线进行了一系列地建模仿真与参数分析,重点研究了偶极子天线性能在金属表面的恶化原因以及金属边缘效应对微带天线性能的影响规律。2)详细分析了标签天线的小型化设计方法,建立了标签天线在金属槽中的仿真模型,着重研究了金属槽尺寸和封装材料对标签天线性能的影响规律,并对标签的天线结构进行了优化设计。最终采用曲流技术提出了一种基于平面倒F天线的小型化UHF RFID标签天线结构,其整体尺寸为25.8mm×19.8mm×2mm。3)将设计的标签天线加工成型,针对标签天线的输入阻抗与标签的最大读取距离进行了相关测试实验,实测结果与仿真结果基本一致,标签在金属槽中的实测最大读取距离可达126cm,验证了标签天线设计方法的可行性。进一步地,将该标签应用于油管标识中,定义了油管标识信息在标签中的存储编码格式,并基于C++程序设计语言与MFC微软基础类库设计了一款油管标签读写软件,实现了油管的有效标识与科学管理。更多还原

【Abstract】 As a maturely developed wireless communication method,RFID technology has been widely used in various fields.With the development of computer technology and communication technology and the further popularization of the Internet of Things technology,the use scenarios of RFID tags have gradually become more diverse,and higher requirements have been placed on the size and environmental adaptability of tags.In some special cases,to ensure that the tag is not damaged,the tag needs to be embedded in the metal groove for use.However,due to the influence of the metal environment,the performance of the tag is seriously deteriorated,and the maximum reading distance of the tags is significantly reduced or even not recognized at all.In view of the above situations,this paper mainly studies the antenna design method of small embedded metal tags,and deeply analyzes the change rule of tag antenna performance in metal slot,and verifies it through a series of simulation analysis and experimental tests.The work of the thesis mainly includes the following parts:1)According to the Friis transmission equation and the radar distance equation,the theoretical calculation formula of the maximum reading distance of the tag is deduced in detail,and the working principle and related design method of the metal-resistant lags are deeply analyzed.Based on the theory of electromagnetic wave transmission and antenna theory,a series of modeling simulations and parameter analyses of dipole antenna and microstrip antenna are carried out by the electromagnetic simulation software.The reasons for the deterioration of dipole antenna performance on the metal surface and the influence law of metal edge effect on microstrip antenna performance are studied.2)The miniaturized design method of the tag antenna is analyzed in detail,and the simulation model of the tag antenna in the metal slot is established.The influence of the metal slot size and packaging material on the performance of the tag antenna is studied,and the structure of the tag antenna is optimized.Finally,a miniaturized UHF RFID tag antenna structure based on the planar inverted-F antenna(PIFA)is proposed by the meandering technology,and its overall size is 25.8mm×19.8mm×2mm.3)The designed tag antenna is processed and formed,and the relevant test results are carried out for the input impedance of the tag antenna and the maximum reading distance of the tag.It can be found that the measured results are basically consistent with the simulation results,and the measured maximum reading distance of the tag in the metal slot can reach 126 cm,which verifies the feasibility of the tag antenna design method.Further,the tag is applied to the tubing identification,the storage coding format of the tubing identification information in the tag is defined,and a tubing tag reading and writing software is designed based on the C++programming language and the MFC microsoft foundation class library,realizing the effective identification and scientific management of the tubing.更多还原