回旋器件前级固态功率放大器的研究

发布时间：2018-06-05 18:06

本文选题：固态功率放大器 + 径向波导　；参考：《电子科技大学》2015年硕士论文

【摘要】：回旋行波管是一种新型毫米波和亚毫米波段高功率回旋器件。它具有高功率和高效率的特点,同时又具有比较宽的带宽。但要达到比较高的输出功率,需要有一定功率的输入信号予以驱动。体积小、电压低、一致性好、工作稳定的固态功率放大器作为驱动回旋行波管的前级放大电路被提了出来,并在实践中得到了广泛的应用,大大促进了毫米波段回旋行波管功率源系统的研制与开发。本文从固态功率源与功率合成的基础理论出发,设计了一款8mm频段固态20W脉冲功率放大器,其具有体积小、噪声低、稳定性好的特点。同时为了与回旋行波管配合使用,本文还设计了与固态功率放大器配套的铁氧体隔离器和增益均衡器。针对固态功率放大器的各个功能部件,本文内容主要包括以下几个方面的内容:1.梳理了毫米波固态功率放大器的分类和特性,并对功率合成网络的相关理论进行了推导,为下面的设计提供理论支撑。2.针对低噪声和小体积的要求,完成芯片和电路的选型,使单路放大器模块达到2W的连续波功率输出。同时设计了矩形波导——微带转换结构,方便模块之间的组装。3.为了使最终的功率放大器达到目标输出功率,需要使用功率合成结构。在不同结构之间比较后,最终选取了径向波导结构作为合成网络原型,利用同轴波导到矩形波导的变换结构,设计了性能比较好的渐变波导型8路和径向波导腔型12路功率合成结构,并针对8路合成结构进行了加工测试。4.在放大器的电源模块中加入了脉冲调制电路,以达到使放大器可以脉冲工作的目的,并将电路在Pspice中进行了进一步仿真。之后还设计了两路电源电路为功率放大器供电。5.分析了铁氧体隔离器的工作原理。利用铁氧体的法拉第旋磁效应,设计了一款8mm波段铁氧体环行器,并以此环行器为基础,设计了环行式铁氧体隔离器,以加大放大链路之间以及固态功率放大器输出端口与回旋行波管输入端口之间的隔离度。6.分析了常用的增益均衡器的工作原理。利用加载有切比雪夫吸波材料的矩形谐振腔组成的陷波单元,针对回旋行波管的增益特性,设计了一款8mm波段的腔体增益均衡器,保证了回旋行波管高效稳定工作。
[Abstract]:Gyrotron TWT is a new type of millimeter wave and sub-millimeter band high power gyrotron. It has the characteristics of high power, high efficiency and wide bandwidth. However, in order to achieve higher output power, a certain power input signal is needed to drive. The solid-state power amplifier, which is small in size, low in voltage, good in consistency and stable in operation, has been proposed as the front amplifier circuit for driving gyrotron, and has been widely used in practice. It greatly promotes the research and development of the millimeter band gyrotron TWT power source system. Based on the basic theory of solid-state power source and power combination, a solid-state 20W pulse power amplifier in 8mm band is designed in this paper. It has the advantages of small volume, low noise and good stability. At the same time, a ferrite isolator and gain equalizer, which are matched with solid-state power amplifier, are designed for use with gyrotron. For each functional component of the solid state power amplifier, this paper mainly includes the following aspects: 1. The classification and characteristics of millimeter-wave solid-state power amplifier are reviewed, and the related theory of power synthesis network is deduced, which provides theoretical support for the following design. 2. According to the requirement of low noise and small volume, the chip and circuit are selected to make the single amplifier module achieve 2W continuous wave power output. At the same time, the rectangular waveguide-microstrip conversion structure is designed to facilitate the assembly of modules. 3. In order to achieve the target output power of the final power amplifier, a power synthesis structure is needed. After comparing the different structures, the radial waveguide structure is selected as the prototype of the synthesis network, and the conversion structure from coaxial waveguide to rectangular waveguide is used. The 8-channel and 12-channel power synthesis structures with better performance are designed, and the fabrication test of 8-channel composite structure is carried out. The pulse modulation circuit is added to the power supply module of the amplifier, so that the amplifier can work pulse, and the circuit is further simulated in PSpice. After that, two power supply circuits are designed to power the power amplifier. The working principle of ferrite isolator is analyzed. Based on the Faraday magnetic effect of ferrite, a ferrite circulator in 8mm band is designed. To increase isolation between amplifying links and between solid state power amplifier output ports and cyclotron input ports. The working principle of common gain equalizer is analyzed. A cavity gain equalizer in 8mm band is designed by using a notch unit with a rectangular resonator loaded with Chebyshev absorbing material and aiming at the gain characteristics of a gyrotron traveling wave tube (TWT), which ensures the gyrotron to work efficiently and stably.
【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】：TN124;TN722.75

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