【摘要】：小型化的大功率、高效率毫米波器件,在國(guó)防裝備中能夠滿足機(jī)載、星載的需求,其功率量級(jí)是其他器件不可替代的。帶狀束擴(kuò)展互作用振蕩管(sheet beam extended interaction oscillator,SBEIO)的大功率、高效率、小型化、高可靠性使之在星載、機(jī)載毫米波器件方面有著優(yōu)良的表現(xiàn)。本文針對(duì)受均勻高頻場(chǎng)調(diào)制的電子注,在腔體主要互作用區(qū)域經(jīng)過換能后,注波同步條件被破壞,影響注波互作用效率的問題進(jìn)行研究。在Ka波段設(shè)計(jì)一種高效率的9個(gè)互作用間隙的梯形高頻結(jié)構(gòu)。對(duì)這種Ka波段高頻結(jié)構(gòu)進(jìn)行冷場(chǎng)仿真、粒子模擬仿真和冷腔測(cè)試。均勻高頻場(chǎng)調(diào)制下,在34 kV,3.5A電子注尺寸8 mm×0.6 mm的直流輸入下,SBEIO的輸出功率為21.6 kW,效率18.1%。本文提出了一種逐漸增強(qiáng)的縱向電場(chǎng)分布來提升注波互作用效率,功率從均勻場(chǎng)仿真的21.6 kW增加到28.1 kW,電子效率從18.1%上升到23.6%。采用相位重匹配技術(shù)對(duì)該結(jié)構(gòu)進(jìn)一步優(yōu)化,使互作用效率得到進(jìn)一步提升功率從28.5 kW增加到36 kW,電子效率從23.6%上升到30%。對(duì)優(yōu)化過程中出現(xiàn)的模式競(jìng)爭(zhēng)問題進(jìn)行處理,優(yōu)化諧振腔結(jié)構(gòu),將競(jìng)爭(zhēng)模式π/8模引出諧振腔,成功抑制了模式競(jìng)爭(zhēng)。根據(jù)實(shí)際需求和加工水準(zhǔn),對(duì)所設(shè)計(jì)的Ka波段SBEIO的高頻結(jié)構(gòu)進(jìn)行加工,并采用矢量網(wǎng)絡(luò)分析儀進(jìn)行冷腔測(cè)試,仿真和冷測(cè)取得較好的一致性,為進(jìn)一步的熱測(cè)實(shí)驗(yàn)奠定基礎(chǔ)。探究更高頻段、更多互作用間隙、更高橫縱比的帶狀電子束高頻結(jié)構(gòu)。具體在W波段設(shè)計(jì)了一種15個(gè)互作用間隙,帶狀束橫縱比15:1的梯形高頻結(jié)構(gòu),直流電子注電壓為44.4 kV,電流2 A,電子注尺寸為6 mm×0.4 mm下可得到功率6.7 kW,效率7.5%。對(duì)W波段的設(shè)計(jì)的高頻結(jié)構(gòu)進(jìn)行加工,對(duì)加工模型使用矢量網(wǎng)絡(luò)分析儀進(jìn)行冷測(cè)和整管熱測(cè),電子流通率高達(dá)99.5%,最終,在輸出48kV,1.8A時(shí),95.09 GHz的電磁波輸出功率可以達(dá)到2.1 kW。本文探究了提高梯形高頻結(jié)構(gòu)的互作用效率的方法,是大功率、小型化的毫米波源實(shí)現(xiàn)的至關(guān)重要的一步,可以為星載、機(jī)載應(yīng)用場(chǎng)合提供可靠的大功率毫米波輻射源。
[Abstract]:The miniaturized high power and high efficiency millimeter-wave devices can meet the requirements of airborne and spaceborne in national defense equipment, and their power level is irreplaceable for other devices. The high power, high efficiency, miniaturization and high reliability of the band-beam extended interacting oscillator (sheet beam extended interaction oscillator,SBEIO) make it have excellent performance in spaceborne and airborne millimeter-wave devices. In this paper, the beam synchronization condition is destroyed and the efficiency of beam-wave interaction is affected by the electron beam modulated by uniform high-frequency field after the energy transfer in the main interaction region of the cavity. A high efficiency trapezoidal high frequency structure with 9 interaction gaps is designed in Ka band. The cold field simulation, particle simulation and cold cavity test are carried out for this Ka band high frequency structure. Under uniform high frequency field modulation, the output power of SBEIO is 21.6 kW, efficiency 18.1 at the DC input of 34 kV,3.5A electron beam size of 8 mm 脳 0.6 mm. In this paper, an increasing longitudinal electric field distribution is proposed to improve the beam-wave interaction efficiency. The power increases from 21.6 kW to 28.1 kW, electron efficiency from 18.1% to 23.6% in uniform field simulation. The phase rematch technique is used to further optimize the structure and further increase the interaction efficiency from 28.5 kW to 36 kW, from 23.6% to 30%. This paper deals with the problem of mode competition in the optimization process, optimizes the structure of the resonator and leads out the 蟺 / 8 mode of the competition mode to the resonator, which successfully inhibits the mode competition. According to the actual demand and processing level, the high frequency structure of the designed Ka band SBEIO is processed, and the cold cavity is tested by vector network analyzer. The simulation and the cold measurement obtain good consistency, which lays a foundation for further thermal measurement experiments. Explore the high frequency band electron beam structure with higher frequency band, more interaction gap and higher aspect ratio. A high frequency trapezoidal structure with a band beam transverse to longitudinal ratio of 15:1 is designed in W band. The DC electron beam voltage is 44.4 kV, current 2 A, and the electron beam size is 6 mm 脳 0.4 mm. The power 6.7 kW, efficiency is obtained. The high frequency structure designed in W band was machined, and the processing model was measured by vector network analyzer. The electron flow rate was up to 99.5. Finally, the output power of electromagnetic wave of 95.09 GHz could reach 2.1 kW. when the output was 48kV / 1.8A. In this paper, the method of improving the interaction efficiency of trapezoidal high frequency structure is explored. It is a very important step in the realization of high power and miniaturized millimeter wave source. It can provide reliable high power millimeter wave radiation source for spaceborne and airborne applications.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN103

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