毫米波扩展互作用器件慢波谐振系统的研究

发布时间：2018-01-21 04:48

本文关键词： 毫米波 EID 慢波谐振系统色散曲线工作模式　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：毫米波是频率范围为30GHz~300GHz范围内的电磁波,介于微波、红外、光波之间。因此兼有这几个特点:第一,波束窄。第二,极宽的带宽。第三,毫米波器件的尺寸较微波器件而言要小很多。第四,相比激光来说,它的传播特性受气候的影响小,接近全天候特性。扩展互作用器件(EID,Extended Interaction Devices)是在二十世纪六十年代发展起来的,互作用机理介于行波管和速调管之间的毫米波真空电子器件,主要有扩展互作用速调管(EIK,Extended Interaction Klystron)和扩展互作用振荡器(EIO,Extended Interaction Oscillator)。与行波管和速调管相比,扩展互作用器件采用的慢波谐振系统兼顾了两者的优点,既可以获得高增益和效率,又可以获得足够大的带宽。EID在毫米波、亚毫米波频段有非常大的发展的潜力,该器件具有结构紧凑、重量轻、体积小、大带宽、工作电压低、输出功率高等特点。目前国际上一些国家在卫星通讯、深空拓扑成像、气候的观测等一些项目上越来越多地采用了EID。本文主要对毫米波段0.14THz带状注扩展互作用器件慢波谐振系统进行了初步研究。本文采用高频电磁模拟软件CST(Computer Simulation Technology)和CHIPIC软件分别对其进行了冷腔仿真和热腔仿真,分析了慢波谐振系统的各结构参数对其影响,得到一组较优的结构参数值来构建模型。然后基于前面构建的模型,针对该慢波谐振系统进行了色散曲线的仿真计算。在色散曲线与PIC仿真的基础上,对模式竞争进行了分析,选取了?模为工作模式,并给予了论证。最后PIC仿真结果表明在较低工作电压18.2kV,工作电流0.5A的条件下,该谐振系统的注波互作用效率可达到22%,工作模式为?模,输出平均功率可达1.98kW,工作频率为149.4GHz。并且在相同的结构参数以及相同电子注横截面积与密度的条件下,对带状束EIO与柱形束EIO进行了比较,最终模拟输出结果表明带状注EIO比柱状注EIO有更高的输出功率和注波互作用效率。这是因为带状注横截面上的纵向电场更加均匀,导致电子受到的密度调制更加均匀、群居效果更好;另外,带状注的耦合阻抗更大。
[Abstract]:Millimeter wave is an electromagnetic wave in the frequency range of 30 GHz or 300 GHz, which is between microwave, infrared and light waves. Therefore, it has the following characteristics: first, narrow beam and second. Wide bandwidth. Third, millimeter-wave devices are much smaller in size than microwave devices. 4th, its propagation characteristics are less affected by climate than lasers. The extended Interaction devices were developed in 1960s. The interaction mechanism is between the traveling wave tube and the klystron millimeter wave vacuum electronic device, mainly has the extended interaction klystron EIK. Extended Interaction Klystron) and extended interaction oscillator EIO. Compared with travelling-wave tube and klystron, the slow wave resonance system used in the extended interaction device takes into account the advantages of Extended Interaction oscillator and klystron. Both high gain and efficiency can be obtained, and the bandwidth. EID in millimeter wave, sub-millimeter wave band has a great potential for development, the device has a compact structure, light weight, small volume. Large bandwidth, low operating voltage, high output power and other characteristics. At present, some countries in the world in satellite communications, deep space topology imaging. EIDs have been used more and more in some projects such as climate observation. The slow wave resonance system of 0.14 THz band beam spread interaction device in millimeter band is studied in this paper. Magnetic simulation software CST(. The cold cavity simulation and the thermal cavity simulation are carried out by Computer Simulation Technology and CHIPIC software respectively. The influence of structural parameters on the slow wave resonance system is analyzed, and a set of optimal structural parameters are obtained to build the model. Then, the model is constructed based on the previous model. The dispersion curve of the slow wave resonance system is simulated. On the basis of the dispersion curve and PIC simulation, the mode competition is analyzed. Finally, the PIC simulation results show that the working voltage is 18.2kV and the working current is 0.5A. The beam-wave interaction efficiency of the resonant system can reach 22. Mode, the average output power can reach 1.98 kW, the working frequency is 149.4 GHz, and under the same structural parameters and the same electron beam cross sectional area and density. The EIO of banded bundles and EIO of columnar bundles were compared. The simulation results show that EIO has higher output power and beam-wave interaction efficiency than cylindrical EIO, which is because the longitudinal electric field is more uniform on the strip beam cross section. As a result, the density modulation of electrons is more uniform and the group effect is better. In addition, the coupling impedance of the band beam is larger.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN015

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