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类型 基础研究 预答辩日期 2017-09-17
开始(开题)日期 2011-04-01 论文结束日期 2017-06-15
地点 东南大学四牌楼校区李文正楼6楼会议室 论文选题来源 973、863项目     论文字数 7 (万字)
题目 基于新型人工电磁表面的电磁波辐射研究
主题词 新型人工电磁材料,新型人工电磁表面,漏波,贝塞尔波束,全息
摘要 新型人工电磁材料自上世纪末至今已有 20 多年的发展历史。近年来,作为新型人工电磁材料的二维情形,新型人工电磁表面具有剖面低、损耗低、成本低、设计简单、加工方便等特点而受到广泛关注。本论文将表面阻抗的概念应用到基于亚波长金属刻槽结构的人工表面等离激元上,对几个典型的辐射特性进行了深入研究和实验验证。主要内容和贡献概括如下: - 基于新型人工电磁表面和全息原理的微波段贝塞尔波束。研究利用基于全息原理的 metasurface 设计微波段后向辐射周期漏波天线,使它在远场形成锥形波束,而对应的近场为贝塞尔波束。从仿真和实验两方面验证了贝塞尔波束的特征,并观察到微波段贝塞尔波束的漏波频扫特性。这种可以动态控制波束长度的贝塞尔波束可望在近场探测、无线能量传输和医学成像等方面获得应用。 - 全息新型人工电磁表面的二维漏波机理分析与波束赋形设计。直接从漏波机理分析了某个方位角的表面波如何产生另外一个方向的方位角漏波辐射,并与之前的全息分析方法作了等价对比,发现漏波机理分析方法更清楚地解释了其方位角和俯仰角的漏波频变性质。进一步研究了基于新型人工电磁表面的波束赋形设计方法和种类,包括多波束、椭圆锥波束、伪椭圆锥波束、组合波束、以及倾斜圆锥波束等。 - 基于一维亚波长金属刻槽结构的表面阻抗周期调制漏波辐射方法及实验验证。利用人工表面等离激元属于横磁波的性质,首次将人工电磁表面中的表面阻抗概念应用到支持人工表面等离极化激元模式的一维亚波长金属刻槽结构,并计算了结构单元对应的表面阻抗。对表面阻抗进行周期调制,利用中心波导耦合缝隙馈电,实现了定向宽边辐射。 - 基于二维亚波长金属刻槽圆盘结构的表面阻抗周期调制漏波辐射方法。利用人工表面等离极化激元色散曲线对亚波长金属刻槽结构的厚度不敏感性,将一维结构的表面阻抗直接推广到二维圆盘结构,分别设计并验证了基于后向漏波的远场圆锥波束和近场贝塞尔波束现象。根据二维全息新型人工电磁表面上的表面波传播方向对极化的影响,提出了基于亚波长金属刻槽结构的离散化螺旋天线设计新方案。
英文题目 Study of Electromagnetic Wave Radiation Based on Metasurface
英文主题词 Metamaterial, Metasurface, Leaky-waves, Bessel beams, Holography
英文摘要 Metamaterial has been developed for more than twenty years since last century. Metasurface is regarded as a two-dimensional case of metamaterial, it has received widespread attention with advantages of low profile, less loss, low cost, flexible to design and easy to fabricate. In this paper, the concept of surface impedance is applied to the spoof SPP supported by subwavelength corrugated metal structure, and several typical characteristics of radiation are studied and experimentally verified. The main contents and contributions are summarized as follows: - Generation of spatial Bessel beams using holographic metasurface. Backward periodic leaky waves supported by holographic metasurface was designed in the microwave frequency regime, so that it forms a conical beam in the far field and a corresponding Bessel beam in the near field. The characteristics of the Bessel beam are verified both from simulation and experiment, and the sweeping frequency characteristics of the Bessel beam are observed. The dynamic focal-depth control of Bessel beam is expected to be used in the near field detection, wireless energy transmission, and medical imaging. - Mechanism analysis and beam shaping design of two-dimensional leaky-waves based on holographic metasurface. How surface wave in a pointed azimuth angle generate leaky-wave radiations in other azimuth angled directions is analyzed directly from the leakage wave mechanism, so as to have an equivalent comparison with the previous holographic analysis method. It is found that the leakage wave mechanism analysis method explains more clearly about how azimuth angle and polar angle changes by sweeping frequency. The types of beam shaping design are studied based on holographic metasurface, including multiple-beams, elliptical cone beams, pseudo-elliptical cone beams, combined beams, and inclined cone beams. - Leaky-wave radiations by modulating surface impedance on one-dimensional subwavelength corrugated metal structures. The concept of surface impedance is applied to the one-dimensional subwavelength metal grooving structure supporting spoof SPP, since spoof SPP is a kind of transverse magnetic surface wave. The corresponding surface impedance of unit cell is calculated. By modulating the surface impedance periodically, and utilizing a central waveguide coupling with a slit to fed the structure, a directional broadside radiation is achieved. - Leaky-wave radiations by modulating surface impedance on two-dimensional subwavelength corrugated metal disc structure. The surface impedance of the one-dimensional structure is applied to the two-dimensional disc structure, since the dispersion curves of the sub-wavelength metal grooved structure insensitive to its thickness. The far-field conical Beams and near-field Bessel beams are both designed and verified based on backward leaky-waves. According to the influence of the polarization of surface waves, a new scheme of discrete spiral antenna based on subwavelength corrugated metal structure is proposed.
学术讨论
主办单位时间地点报告人报告主题
东南大学 2010.05 吴健雄纪念馆 Prof. W. C. Chew CEM, Wave Physics, and Quantum Mechanics
东南大学 2013.06 李文正楼北614 蔡本庚 Holography Leaky-Wave Antenna
东南大学 2013.10 李文正楼北614 蔡本庚 Holographic Metasurface/SPP and Leaky-wave Antenna
东南大学 2013.12 李文正楼北614 蔡本庚 Reveiw Some Works on Metasurface and Spoof SPP
东南大学 2014.04 李文正楼北614 蔡本庚 Metasurface, A Brief Review
东南大学 2015.07 李文正楼北614 蔡本庚 Leaky-waves, A Brief Review
东南大学 2014.08 李文正楼北614 Prof. Douglas H. Weiner Metasurface and MTM-Enabled EM/Optical Devices
东南大学 2014.12 李文正楼北614 Prof. Cheng-Wei Qiu Some Recent Developments in Engineering Light-matter Interaction
     
学术会议
会议名称时间地点本人报告本人报告题目
2013年国际电子科学与技术博士生论坛 2013.08 北京理工大学 Beam Shaping of Monopole on Metasurface by Holography
Metamaterials 2014 2014.08 丹麦,哥本哈根 1-D Holographic Leaky-wave Antenna Using Subwavelength Grooved Metal Structure
     
代表作
论文名称
Generation of spatial Bessel beams using holographic metasurface
Leaky-Wave Radiations by Modulating Surface Impedance on Subwavelength Corrugated Metal Structures
Beam shaping of monopole on metasurface by holography
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
冯一军 正高 教授 博导 南京大学
金飚兵 正高 教授 博导 南京大学
赵永久 正高 教授 博导 南京航空航天大学
车文荃 正高 教授 博导 南京理工大学
程强 正高 教授 博导 东南大学
蒋卫祥 正高 教授 博导 东南大学
马慧锋 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
汤文轩 副高 副教授 东南大学