發(fā)布時間：2018-04-30 23:38

  本文選題：太赫茲 + 返波管��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：太赫茲(Teraherz)輻射指的是頻率在0.1~10THz范圍內(nèi)的電磁波輻射,其波長的范圍是3um~3mm,從頻譜上看,太赫茲輻射波在毫米波和紅外線,大于無線電波頻率,小于光波的頻率。作為一種新興的前沿科學(xué),太赫茲技術(shù)已經(jīng)應(yīng)用在安全檢查、環(huán)境監(jiān)測、航空航天、太赫茲通信、無損檢測、材料科學(xué)和醫(yī)學(xué)成像等許多領(lǐng)域,受到世界各國科學(xué)家的廣泛重視。作為利用太赫茲技術(shù)的先決條件,就是能穩(wěn)定和有效的產(chǎn)生太赫茲信號,這個條件是限制太赫茲器件發(fā)展的關(guān)鍵因素。目前,返波管,也被稱為返波振蕩器,被認(rèn)為是產(chǎn)生太赫茲波最有前景的真空器件,具有可以小型化、寬電子調(diào)諧、造價低的特點(diǎn)。而慢波結(jié)構(gòu)是返波振蕩器中最核心的部分,它的主要功能是交換電子束中電子和電磁場中的能量,是影響返波管性能好壞和各項(xiàng)參數(shù)的重要部分。因此,一種合適的互作用慢波結(jié)構(gòu)對于返波管的高頻振蕩系統(tǒng)來說至關(guān)重要。本文主要設(shè)計了一種擁有新型金屬繞線慢波結(jié)構(gòu)的返波振蕩器,使其工作在0.3THz頻段,使其在整體上具有結(jié)構(gòu)新穎、低造價、容易組裝的特點(diǎn),在性能上具有高輸出功率、高耦合阻抗、低工作電壓和低工作電流密度等特點(diǎn)。本文也詳細(xì)介紹了該結(jié)構(gòu)的設(shè)計過程。為了體現(xiàn)該繞線返波管良好的性能,本文中還設(shè)計了返波管的輸出和匹配結(jié)構(gòu),之后利用3-D電磁仿真模擬軟件CST(Computer Simulation Technology)對整體結(jié)構(gòu)進(jìn)行仿真,并通過優(yōu)化得到了最優(yōu)的冷腔和熱腔的測試參數(shù)。在冷腔仿真方面,得到了色散曲線、耦合阻抗、電場大小和分布、S參數(shù)等參數(shù),在熱腔方面,得到了輸出功率、能量變化過程等參數(shù)。另外,該返波管還可以適用于不同的電子發(fā)射方式,例如傳統(tǒng)的熱陰極電子槍和贗火花放電產(chǎn)生電子的方式,分析了不同的電流密度對輸出功率的影響。最后,當(dāng)工作電壓為1.2kV,工作電流密度是94A/cm2,電流幅值大小為50mA的電條件時,這種擁有新型的繞線慢波結(jié)構(gòu)的返波管可以得到輸出功率大于154mW,工作頻率在335GHz,電子調(diào)諧帶寬超過24GHz的結(jié)果。該研究成果對于太赫茲源器件結(jié)構(gòu)種類的擴(kuò)展具有潛在的應(yīng)用價值。
[Abstract]:Teraherz radiation refers to the electromagnetic wave radiation with a frequency in the range of 0.1~10THz, the wavelength of which is 3 mm or 3 mm. From the spectrum, the terahertz radiation is larger than the frequency of radio wave and less than the frequency of light wave in millimeter wave and infrared ray. As a new frontier science, terahertz technology has been used in many fields, such as safety inspection, environmental monitoring, aerospace, terahertz communication, nondestructive testing, material science and medical imaging, etc. Scientists from all over the world attach great importance to it. As a prerequisite for the use of terahertz technology, it is necessary to produce terahertz signals stably and efficiently. This condition is a key factor limiting the development of terahertz devices. At present, the backwave tube, also known as the backwave oscillator, is considered to be the most promising vacuum device for the generation of terahertz wave. It has the characteristics of miniaturization, wide electron tuning and low cost. The slow wave structure is the core part of the backwave oscillator. Its main function is to exchange the energy in the electron beam and the electromagnetic field. It is an important part that affects the performance and the parameters of the backwave oscillator. Therefore, a suitable interaction slow wave structure is very important for the high frequency oscillation system of the backwave tube. In this paper, a kind of backwave oscillator with a new metal winding slow wave structure is designed to work in the 0.3THz band, which has the characteristics of novel structure, low cost, easy assembly, and high output power in performance. High coupling impedance, low working voltage and low working current density. This paper also introduces the design process of the structure in detail. In order to show the good performance, the output and matching structure of the backward-wave tube is designed, and then the whole structure is simulated by 3-D electromagnetic simulation software CST(Computer Simulation Technology. The optimum parameters of cold cavity and hot cavity are obtained by optimization. In cold cavity simulation, the parameters such as dispersion curve, coupling impedance, electric field size and distribution S parameters are obtained. In thermal cavity, the parameters such as output power and energy change process are obtained. In addition, it can be applied to different electron emission modes, such as the traditional hot cathode electron gun and pseudo-spark discharge, and the influence of different current density on the output power is analyzed. Finally, when the working voltage is 1.2 kV, the working current density is 94 A / cm ~ 2 and the current amplitude is 50mA, The output power is greater than 154mW, the operating frequency is 335GHz, and the electronic tuning bandwidth is higher than 24GHz. The research results have potential application value for the extension of terahertz source devices.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN752;TN125

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 殷勇;;360 GHz返波管的研究[J];真空電子技術(shù);2010年05期

2 任麗娜,曲延濱;毫米波與紅外技術(shù)在軍事領(lǐng)域中的應(yīng)用[J];紅外技術(shù);2004年03期

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本文編號：1826768