基于光透明薄膜的天线研究

发布时间：2018-11-16 20:30

【摘要】：随着无线通信技术的发展,要求天线的性能更加的优异,同时天线的设计难度也不断加大。光透明薄膜由于同时具有导电特性和光透明特性的独特优势,因此可以利用它设计光透明天线,这种光透明天线可以为无线通信中的很多天线难题提供有效的解决方案,例如终端天线、车载天线和星载天线等应用当中。本文首先介绍了光透明薄膜天线的研究意义和研究现状,说明了光透明天线应用的优势和亟待解决的难题。接着总结了光透明薄膜材料的基本性质和用途。光透明薄膜的电导率相比金属的更小,因此光透明薄膜天线的辐射效率很低,此外光透明薄膜材料对温度非常敏感,难于对其进行热焊接。针对这一问题,本文研究了透明单极子天线和透明微带天线提高效率的方法,提出了利用高导电率的金属覆盖透明单极子天线电流密度大的区域来提高其增益,以及利用网格状金属结构贴片替代透明薄膜材料贴片来提高微带天线效率的方法,并通过软件仿真验证了方法的可行性。随后研究了光透明天线的馈电方法。本文还设计了两款利用铟锡氧化物(Indium Tin Oxide, ITO)导电薄膜制作的光透明微带天线,并将其应用在射频识别系统(Radio Frequency Identification, RFID)当中,作为读写器天线使用。首先设计了线极化光透明天线,随后通过改进天线结构实现了圆极化天线特性。通过电磁仿真软件CST对两款天线进行了设计和仿真,并制作了天线实物,测试结果和仿真结果匹配良好,各项测试指标表明两款天线均可以应用在超高频段的RFID系统当中。随后对天线中的关键结构进行了参数扫描分析,并总结了光透明微带天线设计的方法。这部分工作的创新点在于,提出了利用ITO导电薄膜设计光透明微带天线,并将其应用在RFID智能试衣间系统当中,弥补了光透明微带天线领域研究的不足。
[Abstract]:With the development of wireless communication technology, antenna performance is required to be more excellent, at the same time, the design of antenna is becoming more and more difficult. Optical transparent film has the unique advantages of both conductive and transparent characteristics, so it can be used to design optical transparent antenna, which can provide an effective solution for many antenna problems in wireless communication. For example, terminal antenna, vehicle antenna and spaceborne antenna and other applications. In this paper, the research significance and current situation of optical transparent thin film antenna are introduced, and the advantages of optical transparent antenna application and the problems to be solved are explained. Then the basic properties and applications of transparent thin films are summarized. The conductivity of transparent thin film is smaller than that of metal, so the radiation efficiency of transparent film antenna is very low. In addition, the material of transparent film is very sensitive to temperature, so it is difficult to heat weld it. In order to solve this problem, the method of improving the efficiency of transparent monopole antenna and transparent microstrip antenna is studied in this paper, and the gain of transparent monopole antenna is improved by using metal with high conductivity to cover the area with high current density of transparent monopole antenna. The method of improving the efficiency of microstrip antenna by replacing transparent thin film patch with grid metal structure patch is also presented, and the feasibility of the method is verified by software simulation. Then the feeding method of optical transparent antenna is studied. In this paper, we also design two transparent microstrip antennas made from indium tin oxide (Indium Tin Oxide, ITO) conductive thin films, and apply them to the (Radio Frequency Identification, RFID) of radio frequency identification system, which can be used as reader antenna. Firstly, the linear polarized transparent antenna is designed, and then the circular polarization antenna is realized by improving the antenna structure. Two antennas are designed and simulated by electromagnetic simulation software CST, and the antenna object is made. The test results match well with the simulation results. The test results show that the two antennas can be used in the UHF RFID system. Then the key structure of the antenna is analyzed and the design method of the transparent microstrip antenna is summarized. The innovation of this work lies in the design of transparent microstrip antenna using ITO conductive film and its application in RFID intelligent fitting room system, which makes up for the lack of research in the field of optical transparent microstrip antenna.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN820

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