基于人工视觉技术的太赫兹天线设计与研究

发布时间：2018-01-15 09:53

本文关键词：基于人工视觉技术的太赫兹天线设计与研究　出处：《北京邮电大学》2014年硕士论文　论文类型：学位论文

【摘要】：在科学发展给人类带来极大便利的21世纪,视觉残疾患者和盲人由于视觉受损,不能通过视觉感知世界以充分享受美好的生活,视觉疾患给有关家庭带来的不只是生活的艰辛更是心灵的伤痛。把快速发展的先进太赫兹天线技术应用到人工视觉修复系统的研制上,为失明者重获视力带来新的希望,具有重大的社会价值和广阔的应用前景。为了更好地实现太赫兹天线技术与人工视觉系统结合,本文主要研究内容如下： 1.人工视觉修复系统的理论研究调研国内外人工视觉修复技术与应用,研究了人工视觉修复系统的组成结构、类型划分和关键技术,采用将THz天线技术应用于人工视觉系统视觉信号提取前端的方式提升了系统性能。 2.太赫兹天线理论研究通过基础天线理论的学习,了解到天线各项参数的实际意义。在太赫兹天线的设计过程中采用了反射面技术、频率选择表面(FSS)技术和阵列技术,提升了太赫兹天线的性能。 3.新型THz天线设计采用基于FDTD算法的电磁设计软件优化天线结构,设计出几款新型的太赫兹天线,可以满足人工视觉修复系统对于天线小型化、轻量化、高效率的要求。为实现对传统金属波导开槽天线的轻量化改进我们设计出介质集成波导开槽天线,中心工作频率位于88.4GHz,-10dB通带宽度为16.4GHz,最大定向性为13dBi。同时由于波导部分的介质对于电磁波传输损耗较小,天线的整体辐射效率比金属波导天线有所提升。利用贴片型频率选择阵列的带阻特性设计了频率选择表面结构反射面天线,在抛物面反射增强单侧辐射强度聚合波束的基础上有选择的透射电磁波,使得天线的辐射效率提升,天线的反射系数也得到一定程度改善。我们设计了中心工作频率为101GHz,-10dB通带宽度为6GHz,反射系数深达-50dB的太赫兹天线。利用靠近开口处短路板的设计思想我们设计了波导宽边馈电角锥喇叭天线,在增强天线的辐射效率的基础上缩减了天线的整体尺寸。其工作频率为88.5GHz,-10dB通带宽度为17.9GHz,相对带宽高达20.2%,最大定向性为16.5dBi。采用可与人体共生的生物陶瓷为基底,其上覆盖仿生钛合金蝶形结构,设计了可植入眼底陶瓷贴片蝴蝶形天线,工作于0.224THz,-10dB带宽为11.6GHz,最大定向性为11.8dBi。 4.加工测试两款天线基于以上几款天线的设计和国内加工及测试条件,利用微机械精密加工技术实现了波导开槽天线和波导宽边馈电角锥喇叭天线的制作,使用矢量网络分析仪测试了天线的反射系数,并与仿真测试结果做了横向比对,仿真和测试结果具有一定吻合度。本论文为把太赫兹天线技术结合至人工视觉修复系统提供了参考依据,对未来太赫兹天线技术的实际应用具有重要的指导意义。
[Abstract]:In the scientific development brings great convenience to the human visual disability in twenty-first Century, and the blind due to visual impairment, not through the visual perception of the world to fully enjoy the wonderfull life, visual disorders brought about family not only the hardships of life is the pain of the soul. The rapid development of advanced terahertz antenna technology is applied to the development of artificial vision repair system, for the blind regain sight brings new hope, has great social value and wide application prospect. In order to better achieve the THz antenna technology combined with artificial vision system, the main contents are as follows:
The theoretical study of 1. artificial vision repair system
This paper investigates the technology and application of artificial vision repair at home and abroad, studies the structure, type division and key technologies of the artificial vision repair system, and applies THz antenna technology to the front end of the vision signal extraction system of the artificial vision system, which improves the system performance.
2. terahertz antenna theory
Through the learning of basic antenna theory, we know the practical significance of antenna parameters. In the design process of terahertz antenna, reflector technology, frequency selective surface (FSS) technology and array technology are adopted to enhance the performance of terahertz antenna.
3. new THz antenna design
The electromagnetic design software based on the FDTD algorithm is used to optimize the antenna structure, and several new terahertz antennas are designed, which can meet the requirements of the miniaturization, lightening and high efficiency of the artificial vision repair system.
In order to realize the improvement of our design of substrate integrated waveguide slot antenna to the traditional lightweight metal waveguide slot antenna, the center frequency at 88.4GHz -10dB band width is 16.4GHz, the maximum is 13dBi. at the same time as the directional waveguide medium for electromagnetic wave transmission loss is small, the radiation efficiency of the antenna has improved than metal waveguide antenna.
Stopband frequency selection array using the patch type design of frequency selective surface antenna reflecting surface structure, enhance the radiation intensity of the unilateral polymerization beam selective transmission of electromagnetic wave in the parabolic reflector, the antenna radiation efficiency improvement, reflection coefficient of the antenna is also improved to a certain extent. We design the center frequency of 101GHz -10dB, pass band width is 6GHz, depth of -50dB THz antenna reflection coefficient.
The design thought of opening near the short circuit board we designed waveguide feed horn antenna, based on enhancing the radiation efficiency of the antenna on the reduction of the overall size of the antenna. Its working frequency is 88.5GHz, -10dB bandwidth is 17.9GHz, the relative bandwidth of up to 20.2%, the maximum directivity is 16.5dBi.
The bioceramic, which can coexist with human body, is covered with bionic titanium alloy butterfly structure. A butterfly shaped antenna with implanting ceramic patch is designed. It works at 0.224THz, -10dB bandwidth is 11.6GHz, and the maximum orientation is 11.8dBi..
4. processing test two antenna
The above several antenna design and domestic processing and testing based on the condition, makes the waveguide slot antenna and waveguide feed horn antenna with micro machining technology, the reflection coefficient of the antenna test using vector network analyzer, and the horizontal comparison and simulation test, simulation and test results has a certain degree of agreement.
This paper provides a reference for the combination of THz antenna technology and artificial vision repair system, and has important guiding significance for the future application of terahertz antenna technology.

【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R318

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