【摘要】：摘要：太赫茲輻射是波長介于毫米波與紅外線之間,頻率在0.1THz-10THz之間的電磁輻射。隨著太赫茲輻射源,探測器和其他電子設備的發(fā)展,有效傳輸太赫茲波是一個成功的太赫茲系統(tǒng)的關鍵。目前所研究報導的用于太赫茲波傳輸?shù)牟▽p耗一般都大于1dB/m,不適合用于長距離傳輸。因此研究一種低損耗,能遠距離傳輸太赫茲波的波導是很有實際意義的。 本文主要介紹了太赫茲金屬空芯波導以及介質/金屬波導,詳細分析了兩種波導的傳輸損耗。系統(tǒng)地分析了對波導傳輸損耗造成影響的各方面因素。然后對波導結構和波導材料進行了改進,提出了聚四氟乙烯波導和石墨烯/聚四氟乙烯空芯波導結構,并用有限元方法系統(tǒng)的分析了波導的傳輸損耗。 首先,分析了金屬空芯波導中THz波的傳輸機理,并且得出了各個模式的損耗隨著參數(shù)變化的曲線圖。能在太赫茲空芯波導傳輸?shù)哪Ｊ接泻芏?主要的低階模有TE01模,TE11模,TM01模和TE21模。其中TE01模具有最低的傳輸損耗。 其次,介紹了有限元數(shù)值分析方法,介紹了Comsol模場仿真軟件。使用Comsol軟件對太赫茲空芯金屬波導進行了仿真求解,得出波導中存在的主要模式種類,以及每種模式的場分布和傳輸損耗,并且與理論公式給出的損耗值進行比較, 隨后研究了太赫茲介質/金屬波導的結構,討論了其主要模式的傳輸損耗。通過理論分析,討論了介質層厚度、介質層種類、金屬厚度、波導芯徑、傳輸波長對傳輸損耗的影響為確定介質/金屬空芯波導的最佳結構參數(shù)和最佳材料提供了依據。 論文的最后,提出了結構簡單的聚四氟乙烯波導和石墨烯/聚四氟乙烯波導,并通過有限元方法系統(tǒng)的分析了兩種波導中影響模式損耗的各因素。在內半徑等于4mm,包層厚度等于0.5mm的聚四氟乙烯波導中,工作頻率時0.5THz時,基模HE11模的損耗可以達到0.398dB/m。在內半徑為4mm,包層厚度等于0.5mm的石墨烯/聚四氟乙烯波導中,偏置電壓等于10V,工作頻率等于0.5THz時,TE01模的損耗為0.58dB/m。HE11模的損耗可達到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).
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN814

【引證文獻】

相關期刊論文 前1條

1 周婷;梁椿梅;黃蓉;周俊;;金屬刻槽太赫茲波導傳輸特性分析[J];實驗科學與技術;2017年02期

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2 徐蘭蘭;復合結構太赫茲窄帶濾波器的研究[D];哈爾濱工程大學;2017年

3 徐丹;THz波導單模透射機理研究[D];哈爾濱工程大學;2016年

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本文編號：2433547