毫米波带状注扩展互作用器件高频系统研究

发布时间：2018-09-06 15:13

【摘要】：小型化的大功率、高效率毫米波器件,在国防装备中能够满足机载、星载的需求,其功率量级是其他器件不可替代的。带状束扩展互作用振荡管(sheet beam extended interaction oscillator,SBEIO)的大功率、高效率、小型化、高可靠性使之在星载、机载毫米波器件方面有着优良的表现。本文针对受均匀高频场调制的电子注,在腔体主要互作用区域经过换能后,注波同步条件被破坏,影响注波互作用效率的问题进行研究。在Ka波段设计一种高效率的9个互作用间隙的梯形高频结构。对这种Ka波段高频结构进行冷场仿真、粒子模拟仿真和冷腔测试。均匀高频场调制下,在34 kV,3.5A电子注尺寸8 mm×0.6 mm的直流输入下,SBEIO的输出功率为21.6 kW,效率18.1%。本文提出了一种逐渐增强的纵向电场分布来提升注波互作用效率,功率从均匀场仿真的21.6 kW增加到28.1 kW,电子效率从18.1%上升到23.6%。采用相位重匹配技术对该结构进一步优化,使互作用效率得到进一步提升功率从28.5 kW增加到36 kW,电子效率从23.6%上升到30%。对优化过程中出现的模式竞争问题进行处理,优化谐振腔结构,将竞争模式π/8模引出谐振腔,成功抑制了模式竞争。根据实际需求和加工水准,对所设计的Ka波段SBEIO的高频结构进行加工,并采用矢量网络分析仪进行冷腔测试,仿真和冷测取得较好的一致性,为进一步的热测实验奠定基础。探究更高频段、更多互作用间隙、更高横纵比的带状电子束高频结构。具体在W波段设计了一种15个互作用间隙,带状束横纵比15:1的梯形高频结构,直流电子注电压为44.4 kV,电流2 A,电子注尺寸为6 mm×0.4 mm下可得到功率6.7 kW,效率7.5%。对W波段的设计的高频结构进行加工,对加工模型使用矢量网络分析仪进行冷测和整管热测,电子流通率高达99.5%,最终,在输出48kV,1.8A时,95.09 GHz的电磁波输出功率可以达到2.1 kW。本文探究了提高梯形高频结构的互作用效率的方法,是大功率、小型化的毫米波源实现的至关重要的一步,可以为星载、机载应用场合提供可靠的大功率毫米波辐射源。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN103

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