新型太赫兹空芯波导研究
发布时间：2019-03-03 08:34
【摘要】：摘要：太赫兹辐射是波长介于毫米波与红外线之间,频率在0.1THz-10THz之间的电磁辐射。随着太赫兹辐射源,探测器和其他电子设备的发展,有效传输太赫兹波是一个成功的太赫兹系统的关键。目前所研究报导的用于太赫兹波传输的波导损耗一般都大于1dB/m,不适合用于长距离传输。因此研究一种低损耗,能远距离传输太赫兹波的波导是很有实际意义的。 本文主要介绍了太赫兹金属空芯波导以及介质/金属波导,详细分析了两种波导的传输损耗。系统地分析了对波导传输损耗造成影响的各方面因素。然后对波导结构和波导材料进行了改进,提出了聚四氟乙烯波导和石墨烯/聚四氟乙烯空芯波导结构,并用有限元方法系统的分析了波导的传输损耗。 首先,分析了金属空芯波导中THz波的传输机理,并且得出了各个模式的损耗随着参数变化的曲线图。能在太赫兹空芯波导传输的模式有很多,主要的低阶模有TE01模,TE11模,TM01模和TE21模。其中TE01模具有最低的传输损耗。 其次,介绍了有限元数值分析方法,介绍了Comsol模场仿真软件。使用Comsol软件对太赫兹空芯金属波导进行了仿真求解,得出波导中存在的主要模式种类,以及每种模式的场分布和传输损耗,并且与理论公式给出的损耗值进行比较, 随后研究了太赫兹介质/金属波导的结构,讨论了其主要模式的传输损耗。通过理论分析,讨论了介质层厚度、介质层种类、金属厚度、波导芯径、传输波长对传输损耗的影响为确定介质/金属空芯波导的最佳结构参数和最佳材料提供了依据。 论文的最后,提出了结构简单的聚四氟乙烯波导和石墨烯/聚四氟乙烯波导,并通过有限元方法系统的分析了两种波导中影响模式损耗的各因素。在内半径等于4mm,包层厚度等于0.5mm的聚四氟乙烯波导中,工作频率时0.5THz时,基模HE11模的损耗可以达到0.398dB/m。在内半径为4mm,包层厚度等于0.5mm的石墨烯/聚四氟乙烯波导中,偏置电压等于10V,工作频率等于0.5THz时,TE01模的损耗为0.58dB/m。HE11模的损耗可达到0.6215dB/m。
[Abstract]:Terahertz radiation is electromagnetic radiation with wavelength between millimeter wave and infrared ray and frequency between 0.1THz-10THz. With the development of terahertz radiation sources, detectors and other electronic devices, the efficient transmission of terahertz waves is the key to a successful terahertz system. The waveguide losses reported at present for terahertz wave transmission are generally more than 1 dB / m and are not suitable for long-distance transmission. Therefore, it is meaningful to study a waveguide with low loss and long-distance transmission of terahertz wave. In this paper, the terahertz metallic hollow waveguide and dielectric / metal waveguide are mainly introduced, and the transmission losses of the two waveguides are analyzed in detail. The factors that influence the transmission loss of waveguide are analyzed systematically. Then the waveguide structure and the waveguide material are improved, the PTFE waveguide and graphene / PTFE hollow waveguide structure are proposed, and the transmission loss of the waveguide is analyzed systematically by the finite element method. Firstly, the propagation mechanism of THz wave in metal hollow waveguide is analyzed, and the curves of the loss of each mode varying with the parameters are obtained. There are many modes that can transmit in terahertz hollow waveguide. The main low order modes are TE01 mode, TE11 mode, TM01 mode and TE21 mode. The TE01 mold has the lowest transmission loss. Secondly, the finite element numerical analysis method is introduced, and the simulation software of Comsol mode field is introduced. The terahertz hollow metal waveguide is simulated by using Comsol software. The main types of modes in the waveguide, the field distribution and transmission loss of each mode are obtained, and the results are compared with those given by the theoretical formula. Then the structure of terahertz dielectric / metal waveguide is studied and the transmission loss of the main modes is discussed. Through theoretical analysis, the effects of dielectric layer thickness, dielectric layer type, metal thickness, waveguide core diameter and transmission wavelength on transmission loss are discussed, which provide the basis for determining the optimum structural parameters and materials of dielectric / metal hollow waveguide. Finally, a simple PTFE waveguide and a graphene / PTFE waveguide are proposed, and the factors affecting the mode loss in the two waveguides are systematically analyzed by the finite element method (FEM). In polytetrafluoroethylene waveguides with inner radius of 4 mm and cladding thickness of 0.5mm, the loss of the fundamental mode HE11 mode can reach 0.398dB 路m ~ (- 1) when the operating frequency of HE11 is equal to 0.398dB 路m ~ (- 1). In graphene / PTFE waveguide with inner radius of 4 mm and cladding thickness of 0.5mm, the bias voltage is equal to 10 V and the operating frequency is equal to 0.5THz. When the loss of TE01 mode is equal to 0.58dB/m.HE11 mode, the loss of TE01 mode can reach 0.6215 dB 路m ~ (- 1).
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN814
本文编号：2433547
[Abstract]:Terahertz radiation is electromagnetic radiation with wavelength between millimeter wave and infrared ray and frequency between 0.1THz-10THz. With the development of terahertz radiation sources, detectors and other electronic devices, the efficient transmission of terahertz waves is the key to a successful terahertz system. The waveguide losses reported at present for terahertz wave transmission are generally more than 1 dB / m and are not suitable for long-distance transmission. Therefore, it is meaningful to study a waveguide with low loss and long-distance transmission of terahertz wave. In this paper, the terahertz metallic hollow waveguide and dielectric / metal waveguide are mainly introduced, and the transmission losses of the two waveguides are analyzed in detail. The factors that influence the transmission loss of waveguide are analyzed systematically. Then the waveguide structure and the waveguide material are improved, the PTFE waveguide and graphene / PTFE hollow waveguide structure are proposed, and the transmission loss of the waveguide is analyzed systematically by the finite element method. Firstly, the propagation mechanism of THz wave in metal hollow waveguide is analyzed, and the curves of the loss of each mode varying with the parameters are obtained. There are many modes that can transmit in terahertz hollow waveguide. The main low order modes are TE01 mode, TE11 mode, TM01 mode and TE21 mode. The TE01 mold has the lowest transmission loss. Secondly, the finite element numerical analysis method is introduced, and the simulation software of Comsol mode field is introduced. The terahertz hollow metal waveguide is simulated by using Comsol software. The main types of modes in the waveguide, the field distribution and transmission loss of each mode are obtained, and the results are compared with those given by the theoretical formula. Then the structure of terahertz dielectric / metal waveguide is studied and the transmission loss of the main modes is discussed. Through theoretical analysis, the effects of dielectric layer thickness, dielectric layer type, metal thickness, waveguide core diameter and transmission wavelength on transmission loss are discussed, which provide the basis for determining the optimum structural parameters and materials of dielectric / metal hollow waveguide. Finally, a simple PTFE waveguide and a graphene / PTFE waveguide are proposed, and the factors affecting the mode loss in the two waveguides are systematically analyzed by the finite element method (FEM). In polytetrafluoroethylene waveguides with inner radius of 4 mm and cladding thickness of 0.5mm, the loss of the fundamental mode HE11 mode can reach 0.398dB 路m ~ (- 1) when the operating frequency of HE11 is equal to 0.398dB 路m ~ (- 1). In graphene / PTFE waveguide with inner radius of 4 mm and cladding thickness of 0.5mm, the bias voltage is equal to 10 V and the operating frequency is equal to 0.5THz. When the loss of TE01 mode is equal to 0.58dB/m.HE11 mode, the loss of TE01 mode can reach 0.6215 dB 路m ~ (- 1).
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN814
【引证文献】
相关期刊论文 前1条
1 周婷;梁椿梅;黄蓉;周俊;;金属刻槽太赫兹波导传输特性分析[J];实验科学与技术;2017年02期
相关博士学位论文 前1条
1 于莹莹;太赫兹波导及特性研究[D];哈尔滨工程大学;2016年
相关硕士学位论文 前3条
1 王艳;时域积分方程法研究石墨烯太赫兹频段色散特性[D];南京邮电大学;2017年
2 徐兰兰;复合结构太赫兹窄带滤波器的研究[D];哈尔滨工程大学;2017年
3 徐丹;THz波导单模透射机理研究[D];哈尔滨工程大学;2016年
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