RFID近场天线应用及设计方法研究

发布时间：2018-02-20 19:10

本文关键词： RFID系统近场天线微带天线谐振腔模型法优化设计方法　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：RFID(Radio Frequency Identification,射频识别)系统在交通、物流货运、工业生产、设备监控以及服务行业等诸多领域中已经得到了广泛的应用。RFID系统主要由标签(Tag)、应用系统(Application System)和读写器(Reader)三个部分组成。依据RFID系统中的标签在读写器天线的哪个辐射场区被激活,将RFID系统分为近场RFID系统和远场RFID系统。超高频近场RFID系统由于其具有ILT(Item Level Tagging,物品级标签识别)和更高的数据通信速率与存储量的特点受到了越来越多的关注,随之应用于的超高频近场RFID系统的读写器近场天线的设计方法研究也受到了越来越多的重视。由于天线辐射近场区的场分布没有形成规律的方向图,近场天线没有一个行之有效的设计理论支撑。因此,对超高频RFID近场天线的设计方法和测试方法的研究已经成为了一个十分重要的研究课题。本文对近场天线的应用及设计方法进行深入研究,结合天线近场耦合原理和微带天线谐振腔模型法,提出了一种近场天线的优化设计方法,还将天线应用到电信机柜管理系统中,利用HFSS对设计出的天线进行仿真,并加以测试验证。本文的主要工作体现在以下的四个方面:(1)依据微带天线谐振腔模型法,提出了以微带天线TM模在自由空间中辐射近场区的场强分布为参数的目标函数,优化出天线的几何参数;(2)利用HFSS对优化出的天线的几何形状进行建模仿真,得出天线在自由空间中以及在电信机柜环境下的回波损耗和辐射近场区的场强分布的仿真结果;(3)建立针对电信机柜环境下的近场天线的辐射近场区的场强分布的测量系统,并测试单根近场天线的辐射近场区的场强分布;(4)提出了对于覆盖整个电信机柜管理平面的天线系统的设计方案,利用时分系统连接8根近场天线与RFID系统读写器。制作出的天线经过测试,在电信机柜环境下的回波损耗在频带918MHz~926MHz中小于-10dB,并且谐振于922MHz。并且单根近场天线的近场场强能够覆盖电信机柜管理平面内的500mm×300mm的区域,并据此确定出覆盖整个电信机柜平面的天线系统的设计方案。最后本文对全文作了总结,并对今后仍可以深入研究的内容作了展望。
[Abstract]:RFID(Radio Frequency Identification (RFID) systems in transportation, logistics, freight, industrial production, RFID system has been widely used in many fields, such as equipment monitoring and service industry. RFID system is mainly composed of tag tag, application system and reader. According to the tag in RFID system, which is in the reader antenna? Three radiation fields have been activated, The RFID system is divided into near-field RFID system and far-field RFID system. UHF near-field RFID system has attracted more and more attention because of its characteristics of ILT(Item Level tagging (object-level label recognition) and higher data communication rate and storage capacity. More and more attention has been paid to the design method of reader near field antenna in UHF near field RFID system. Because the field distribution of antenna radiation near field does not form a regular pattern, The near-field antenna is not supported by an effective design theory. The research on the design and test methods of UHF RFID near-field antenna has become a very important research topic. In this paper, the application and design method of near-field antenna are deeply studied. Combined with the principle of near-field coupling of antenna and the resonator model method of microstrip antenna, an optimal design method of near-field antenna is proposed. The antenna is also applied to the management system of telecommunication cabinet, and the designed antenna is simulated by HFSS. The main work of this paper is as follows: 1) according to the resonant cavity model method of microstrip antenna, the objective function is proposed, which takes the field intensity distribution of TM mode of microstrip antenna in the radiation near field region in free space as the parameter. The geometric parameters of the optimized antenna are simulated by HFSS, and the geometric shape of the optimized antenna is modeled and simulated. The simulation results of echo loss and field intensity distribution in the near field region of antenna in the free space and in the environment of telecommunication cabinet are obtained. The measurement system for the field intensity distribution in the near field area of the near field antenna in the environment of telecommunication cabinet is established. The field intensity distribution in the radiation near-field region of a single near-field antenna is tested. A design scheme for the antenna system covering the whole management plane of the telecommunication cabinet is proposed. Using the time division system to connect 8 near-field antennas to the RFID system reader. The echo loss in the environment of telecommunication cabinet is less than -10 dB in the frequency band 918 MHz ~ 926 MHz, and the resonance is 922 MHz. The near-field intensity of a single near-field antenna can cover the 500mm 脳 300mm area in the management plane of the telecommunication cabinet. Based on this, the design scheme of antenna system covering the whole plane of telecommunication cabinet is determined. Finally, this paper summarizes the full text and looks forward to the contents that can be further studied in the future.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN822;TP391.44

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