论文标题:偶极子天线在电子标签中的应用研究
The Study for the Dipole Antenna in Tag
论文作者
论文导师 刘公望,论文学位 硕士,论文专业 电路与系统
论文单位 大连海事大学,点击次数 1895,论文页数 71页File Size9277K
2007-02-01论文网 http://www.lw23.com/lunwen_22807/
RFID; Tag; Dipole Antenna; Circular Polarization
射频识别(Radio Frequency Identification，简称RFID)是一种非接触式的自动识别技术。射频识别系统主要由电子标签和阅读器组成。它通过射频信号自动识别目标对象并获取相关数据，识别工作无须人工干预，可工作于各种恶劣环境。 本文采用Ansoft HFSS电磁场仿真软件，对在远距离耦合的RFID应用系统中电子标签设计最常用的偶极子天线做了分析研究。所有的仿真分析基于902-928MHz的UHF频段，采用无源电子标签。 首先将电子标签设计中的偶极子天线分类为细对称振子天线、圆柱对称振子天线、折合偶极子天线、弯折偶极子天线、短路环和开路环偶极子天线，并分别对它们的电性能参数做了仿真分析，包括方向性函数、波瓣图、天线阻抗、天线增益、驻波比值、回波损耗等，得出了将偶极子天线弯折能够达到尺寸缩减、折合偶极子天线的阻抗易于调试、短路环和开路环偶极子的电小环形状对天线电性能的影响甚微等变化规律。 其次，以细对称振子天线为例，分析了线径的粗细、馈电点的位置、天线弯曲的角度对天线工作性能的影响。通过仿真结果表明，随着线径、馈电点位置、天线弯曲角度的变化，天线的电性能参数也遵循着一定的变化规律，这些变化规律为电子标签的设计提供了参考价值。 再次，随着RFID技术的不断发展，电子标签的应用环境越来越广泛。本文针对电子标签的应用环境——金属和手持，设计了两款金属电子标签和门票电子标签。其中，金属电子标签具有小尺寸、阻抗易匹配、副瓣少、方向性好、宽频带和高增益等特点；门票电子标签是利用手持的应用环境将线极化方式的电子标签集成为圆极化的极化方式，从而保证了标签工作性能的稳定性。
Radio frequency identification (RFID) is one kind of the non-contact type automatic identification technology. Radio frequency identification system mainly is composed of tag and interrogator. It automatic diagnosis goal object and gain correlated data through the radio-frequency signals, the identification work does not need the manual intervention, and may work in various adverse circumstance.This article uses Ansoft HFSS which is electromagnetic field simulation software to do the analysis research of dipole antenna. The dipole antenna is most commonly used in tag design of the long-distance coupling RFID application system. All simulation analysis based on the 902-928MHz UHF frequency band and uses the passive tag.Firstly, the dipole antenna in tag design is classified for the thin- symmetrical oscillator dipole antenna, the cylindrical symmetry oscillator antenna, the folded dipole antenna, the bend dipole antenna, the short circle and open circle dipole antenna, and has respectively made the simulation and analysis on their electronic performance parameter, including the directive function, lobe pattern, antenna impedance, antenna gain, standing wave ratio, return loss and so on. The results of the simulation are that the bend dipole antenna has been able to reduce the size, the folded dipole antenna impedance is easily to reach, the electricity circlet shape of the short circle and the open circle dipole antenna influence really micro to the antenna electricity performance and so on.Secondly, take the thin- symmetrical oscillator dipole antenna as the example, the article has analyzed the line diameter, the fed point position, the curving angle to the electronic performance of the antenna. The simulation result indicated that, along with the line diameter, the fed point position, the change of the antenna curving angle, the antenna electricity performance parameter is following certain regularities too. These
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