用于太赫兹成像系统的透镜技术研究

发布时间：2018-06-24 16:45

本文选题：太赫兹 + 平面天线　；参考：《北京理工大学》2015年硕士论文

【摘要】：太赫兹成像技术在安检、医疗等领域具有广泛的应用前景，已成为当下的热点研究领域。本文主要研究用于太赫兹成像系统收发前端的集成透镜天线技术，即由片上天线和介质透镜组成的探测单元，，充分利用了单片集成系统成本低、尺寸小、重量轻、适应性强等优点。本文沿着单像素透镜天线向多像素透镜天线阵列扩展的研究思路，在多像素系统方面，扩展半球透镜和复眼微透镜是透镜天线阵列的两种主要探究方案。本文结合理论与电磁仿真对比了几种工作于340GHz频点的太赫兹片上天线，并选择对数周期天线作为辐射单元。对扩展半球透镜的原理进行了分析，给出了硅、石英和聚酯材料透镜的设计规律，结合对数周期天线给出了单像素透镜天线系统的仿真优化结果，并完成方向图测试，仿真和测试结果基本吻合。基于扩展半球透镜和复眼微透镜，仿真设计了2×2透镜天线阵列，仿真结果显示两种系统波束分离特性和增益均良好。对于扩展半球透镜天线阵列，在斯特列尔比不小于0.63以及现有加工条件下30mm直径硅透镜最大可容纳2×2天线阵列、30mm直径石英透镜最大可容纳4×4天线阵列。对于复眼微透镜天线阵列，加工是主要难点，晶体材料加工难度大、成本高，而非晶体材料（聚酯类）可利用3D打印技术实现，因此对于复眼微透镜方案利用非晶体材料是更合理的选择。对比两种方案，基于扩展半球透镜的方案加工相对容易且阵单元方向性更好，而基于复眼微透镜的方案加工相对困难但波束分离特性和可拓展性更具优势。
[Abstract]:Terahertz imaging technology has a wide application prospect in security, medical and other fields, and has become a hot research field. This paper mainly studies the integrated lens antenna technology used in the front end of THz imaging system, that is, the detection unit composed of on-chip antenna and dielectric lens, which makes full use of the monolithic integrated system with low cost, small size and light weight. Strong adaptability and other advantages. In this paper, the single pixel lens antenna is extended to the multi-pixel lens antenna array. In the multi-pixel system, the extended hemispherical lens and the compound eye microlens are the two main exploration schemes of the lens antenna array. Combined with theory and electromagnetic simulation, several terahertz antennas working at 340 GHz are compared in this paper, and logarithmic periodic antennas are chosen as radiation elements. The principle of extended hemispherical lens is analyzed, the design rules of silicon, quartz and polyester lens are given, the simulation optimization results of single pixel lens antenna system are given in combination with logarithmic periodic antenna, and the pattern test is completed. The simulation and test results are in good agreement with each other. Based on the extended hemispherical lens and the compound eye microlens, a 2 脳 2 lens antenna array is designed. The simulation results show that the beam separation characteristics and gain of the two systems are good. For the extended hemispherical lens array, the maximum capacity of the 30mm diameter silicon lens is 2 脳 2 antenna array, 30mm diameter quartz lens, 4 脳 4 antenna array under the Steller-ratio not less than 0.63 and the existing processing conditions. For the compound eye microlens antenna array, processing is the main difficulty, the processing of crystal material is difficult and the cost is high, while the non-crystalline material (polyester) can be realized by 3D printing technology. Therefore, it is more reasonable to use amorphous materials for compound eye microlens. Compared with the two schemes, the scheme based on extended hemispherical lens is relatively easy to process and the orientation of array elements is better, while the scheme based on compound eye microlens is relatively difficult to process, but the beam separation characteristics and expansibility are more advantageous.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN821.5

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