發(fā)布時(shí)間：2018-06-17 15:06

  本文選題：TE_(12)高階�；匦胁ü� + TE_(12)輸入耦合器��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：回旋行波管作為電真空器件家族中重要一員,具有高功率寬頻帶的特點(diǎn),在毫米波雷達(dá)、毫米波通訊、電子戰(zhàn)等方面具有廣泛的應(yīng)用前景。然而回旋行波管工作在W或更高頻段時(shí),若工作模式仍然采用TE11或TE01等低階模式,高頻尺寸會變小。這樣帶來的問題是管子功率容量受限,易發(fā)生電子截獲,加工困難等。采用高階模式作為回旋行波管的工作模式可以有效的解決這一問題。因而研究高階�；匦胁ü芫哂兄匾囊饬x。圍繞高階�；匦胁ü艿难芯�,本論文主要做了以下兩個(gè)方面的研究工作:一是對以TE12模式作為工作模式的回旋行波管的高頻互作用結(jié)構(gòu)以及輸入輸出系統(tǒng)進(jìn)行了研究;二是圍繞回旋行波管中常用到的低/高階模式激勵器進(jìn)行了研究。主要研究內(nèi)容及結(jié)果如下:第二章對以TE12模式作為工作模式的回旋行波管的高頻結(jié)構(gòu)進(jìn)行了設(shè)計(jì)研究。首先基于小信號理論計(jì)算了工作模式TE12以及與TE12模式色散曲線幾乎重合的TE41模式的起振電流。研究計(jì)算表明當(dāng)磁場取為切點(diǎn)磁場的0.988倍時(shí),TE12、TE41模式的起振電流達(dá)到10A以上,因而工作電流為10A時(shí),可以保證這兩個(gè)模式不發(fā)生絕對不穩(wěn)定性�；谛⌒盘柪碚撏瑫r(shí)也計(jì)算了與電子回旋模色散曲線交于kz負(fù)半軸的可能發(fā)生返波振蕩的模式的無損起振長度,以及各模式起振長度達(dá)到20cm時(shí)相應(yīng)所需要的損耗值。然后基于小信號理論計(jì)算的結(jié)果仿真分析了材料對各模式的損耗情況,并確定了一個(gè)可以穩(wěn)定工作的介質(zhì)分布加載高頻結(jié)構(gòu)。最后分析了光滑段長度、電壓、磁場等的改變對高頻輸出的影響。第三章對TE12模式回旋行波管的輸入輸出系統(tǒng)進(jìn)行了研究。設(shè)計(jì)了單Y分支Bragg反射器式輸入耦合器,針對同一單Y分支結(jié)構(gòu)設(shè)計(jì)了兩種Bragg反射器,解決了傳統(tǒng)截止波導(dǎo)在高頻段尺寸過小的問題,加工測試了一個(gè)帶矩形波紋波導(dǎo)Bragg反射器的輸入耦合器。為了進(jìn)一步提高輸入耦合器的轉(zhuǎn)換效率,提出了一種雙扭Y分支輸入耦合器結(jié)構(gòu),仿真結(jié)果顯示相較于單Y分支結(jié)構(gòu)TE12模式的轉(zhuǎn)化從-1dB左右提高到了-0.5dB左右。輸出窗的設(shè)計(jì)中間層為藍(lán)寶石,厚度1mm,匹配石英的厚度為0.42mm,仿真及理論計(jì)算顯示帶寬滿足設(shè)計(jì)要求,熱分析結(jié)果顯示窗片可以有效工作,最后加工測試了單層藍(lán)寶石窗片。第四章對回旋行波管中常用到的模式激勵器進(jìn)行了研究。首先提出了一種新型的可以激勵TE0n/TE2n/TE1n'模式的激勵器,設(shè)計(jì)思路為矩形TE10→矩形TEn'0→圓波導(dǎo)TE0n/TE2n/TE1n'。該模式激勵器可以激勵起低階/高階模式,結(jié)構(gòu)緊湊,加工簡便,模式純度高,工作帶寬較寬。在我們提出的結(jié)構(gòu)基礎(chǔ)上設(shè)計(jì)加工測試了一個(gè)低階的TE01模式激勵器、TE01/TE21模式激勵器(同一種拓?fù)浣Y(jié)構(gòu))、以及一個(gè)高階的TE13模式激勵器,并設(shè)計(jì)了一個(gè)高階的TE12模式激勵器以用于TE12模式高階�；匦胁ü苤�。最后還設(shè)計(jì)測試了一個(gè)高階模TE13模式輸入耦合器,相較于TE12模式輸入耦合器TE13模式輸入耦合器的競爭模式更加難以抑制。針對這個(gè)難點(diǎn)提出了波導(dǎo)壁側(cè)壁開槽的思想,破壞競爭模式的電場結(jié)構(gòu),抑制競爭模式的形成,并提高設(shè)計(jì)模式的轉(zhuǎn)化效率。研究采用高階模的回旋行波管可以避免采用低階模時(shí)在W頻段或更高頻段因尺寸過小帶來的功率容量受限、加工困難等問題。低階/高階模式激勵器的研究對于回旋行波管的冷測和熱測實(shí)驗(yàn)具有重要意義。
[Abstract]:Cyclotron traveling wave tube, as an important member of the electric vacuum device family, has the characteristics of high power and wide band. It has a wide application prospect in millimeter wave radar, millimeter wave communication and electronic warfare. However, when the gyrotron works in W or more high frequency section, if the working mode still uses the low order mode such as TE11 or TE01, the high frequency size will be smaller. The problem is that the power capacity of the tube is limited, the electronic interception is easy to happen and the processing is difficult. The high order mode as the working mode of the gyrotron can effectively solve this problem. Therefore, it is of great significance to study the high order mode gyrotron. The next two aspects of research work: first, the high frequency interaction structure of gyrotron with TE12 mode as the working mode and the input and output system are studied. Two is the study of the low / high order mode exciter commonly used in the gyrotron. The main research contents and results are as follows: the second chapter is based on the TE12 mode. The high frequency structure of the gyrotron for the working mode is designed and studied. First, based on the small signal theory, the working mode TE12 and the TE41 mode which almost coincide with the TE12 mode dispersion curve are calculated. The calculation shows that when the magnetic field is 0.988 times of the tangent magnetic field, the vibration current of the TE12 and TE41 mode reaches more than 10A. Therefore, when the working current is 10A, it can ensure that the two modes do not have absolute instability. Based on the small signal theory, the lossless vibration length of the mode of the possible back wave oscillation with the electron cyclotron mode dispersion curve to the KZ negative semi axis is also calculated, and the corresponding loss values of the modes when the mode length reaches 20cm are required. Then based on the results of the small signal theory, the loss of the material to each mode is simulated and analyzed, and a high frequency structure which can work steadily is determined. Finally, the influence of the length, voltage and magnetic field of the smooth section on the high frequency output is analyzed. The third chapter is on the input and output system of the TE12 mode gyrotron. A single Y branch Bragg reflector type input coupler is designed. Two kinds of Bragg reflectors are designed for the same single Y branch structure. The problem of the traditional cut-off waveguide is too small at high frequency, and a input coupler with rectangular corrugated waveguide Bragg reflector is processed and tested. In order to further improve the input coupler, the input coupler is further improved. A double twist Y branch input coupler structure is proposed. The simulation results show that the transformation of the TE12 mode of the single Y branch structure is increased from about -1dB to about -0.5dB. The design middle layer of the output window is sapphire, the thickness is 1mm, the thickness of the matched quartz is 0.42mm, and the simulation and theoretical calculation show that the bandwidth meets the design requirements. The thermal analysis results show that the windows can work effectively, and finally the single layer sapphire windows are processed and tested. The fourth chapter is a study of the mode exciter commonly used in the gyrotron. First, a new type of exciter which can stimulate the TE0n/TE2n/TE1n'mode is proposed. The design idea is rectangular TE10 to rectangle TEn'0 to circular waveguide TE0n/TE2n/ TE1n'. the mode exciter can stimulate low order / high order mode, compact structure, easy processing, high mode purity and wide bandwidth. On the basis of our proposed structure, a low order TE01 mode exciter, TE01/TE21 mode exciter (the same topology), and a high order TE13 mode exciter are designed and tested. A high order TE12 mode exciter is designed to be used in the TE12 mode high order mode gyrotron. Finally, a high order mode TE13 mode input coupler is designed and tested. Compared to the competition mode of the TE13 mode input coupler of the TE12 mode input coupler, the slotting of the side wall of the waveguide wall is put forward. The idea, which destroys the electric field structure of the competition mode, inhibits the formation of the competition mode and improves the conversion efficiency of the design mode. The study of the gyrotron using the high order mode can avoid the problem of the limited power capacity and processing difficulties in the W band or the more high frequency section when the low order mode is used. The research is of great significance for the cold test and thermal test of gyro TWT.
【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】：TN124

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 陳輝;王麗;羅勇;唐勇;;Q波段回旋行波管新型盒型輸出窗的設(shè)計(jì)[J];強(qiáng)激光與粒子束;2015年01期

2 劉濮鯤;杜朝海;;毫米波回旋行波放大器的發(fā)展評述[J];微波學(xué)報(bào);2013年Z1期

3 徐勇;羅勇;王建勛;鄢然;蒲友雷;王暉;王麗;李宏福;熊彩東;;Ka波段TE_(10)~□-TE_(01)~○寬帶模式變換器的設(shè)計(jì)[J];真空科學(xué)與技術(shù)學(xué)報(bào);2013年04期

4 徐勇;羅勇;李宏福;熊彩東;王建勛;;高功率回旋行波管新型寬帶輸出窗的設(shè)計(jì)[J];紅外與毫米波學(xué)報(bào);2013年02期

5 徐勇;熊彩東;羅勇;王建勛;鄢然;王暉;;高功率毫米波回旋行波管寬帶輸出窗設(shè)計(jì)[J];微波學(xué)報(bào);2011年04期

6 杜朝海;劉濮鯤;薛謙忠;;基于損耗介質(zhì)加載波導(dǎo)的回旋行波管放大器的互作用分析[J];物理學(xué)報(bào);2010年07期

7 王麗;鄢然;蒲友雷;羅勇;;高功率毫米波回旋器件的需求及發(fā)展[J];真空電子技術(shù);2010年02期

8 張新仁;劉濮鯤;徐壽喜;;3mm回旋行波管高頻窗的設(shè)計(jì)[J];微波學(xué)報(bào);2008年05期

9 鄢然;羅勇;李家胤;蒲友雷;王建勛;雷朝軍;劉迎輝;;Kα波段介質(zhì)加載回旋行波管小信號分析與設(shè)計(jì)[J];物理學(xué)報(bào);2008年01期

相關(guān)會議論文 前1條

1 鄢然;羅勇;雷朝軍;;介質(zhì)加載回旋行波管工作模式自激振蕩現(xiàn)象分析[A];第九屆真空技術(shù)應(yīng)用學(xué)術(shù)年會論文集[C];2006年

相關(guān)博士學(xué)位論文 前1條

1 鄢然;磁控注入電子槍低頻振蕩分析及Ka波段回旋行波管研究[D];電子科技大學(xué);2010年

相關(guān)碩士學(xué)位論文 前1條

1 徐勇;高功率回旋管輸出窗的研究[D];電子科技大學(xué);2006年

，

本文編號：2031463