本文選題：固態(tài)功率放大器 + 徑向波導(dǎo)��； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：回旋行波管是一種新型毫米波和亞毫米波段高功率回旋器件。它具有高功率和高效率的特點(diǎn),同時(shí)又具有比較寬的帶寬。但要達(dá)到比較高的輸出功率,需要有一定功率的輸入信號(hào)予以驅(qū)動(dòng)。體積小、電壓低、一致性好、工作穩(wěn)定的固態(tài)功率放大器作為驅(qū)動(dòng)回旋行波管的前級(jí)放大電路被提了出來,并在實(shí)踐中得到了廣泛的應(yīng)用,大大促進(jìn)了毫米波段回旋行波管功率源系統(tǒng)的研制與開發(fā)。本文從固態(tài)功率源與功率合成的基礎(chǔ)理論出發(fā),設(shè)計(jì)了一款8mm頻段固態(tài)20W脈沖功率放大器,其具有體積小、噪聲低、穩(wěn)定性好的特點(diǎn)。同時(shí)為了與回旋行波管配合使用,本文還設(shè)計(jì)了與固態(tài)功率放大器配套的鐵氧體隔離器和增益均衡器。針對(duì)固態(tài)功率放大器的各個(gè)功能部件,本文內(nèi)容主要包括以下幾個(gè)方面的內(nèi)容:1.梳理了毫米波固態(tài)功率放大器的分類和特性,并對(duì)功率合成網(wǎng)絡(luò)的相關(guān)理論進(jìn)行了推導(dǎo),為下面的設(shè)計(jì)提供理論支撐。2.針對(duì)低噪聲和小體積的要求,完成芯片和電路的選型,使單路放大器模塊達(dá)到2W的連續(xù)波功率輸出。同時(shí)設(shè)計(jì)了矩形波導(dǎo)——微帶轉(zhuǎn)換結(jié)構(gòu),方便模塊之間的組裝。3.為了使最終的功率放大器達(dá)到目標(biāo)輸出功率,需要使用功率合成結(jié)構(gòu)。在不同結(jié)構(gòu)之間比較后,最終選取了徑向波導(dǎo)結(jié)構(gòu)作為合成網(wǎng)絡(luò)原型,利用同軸波導(dǎo)到矩形波導(dǎo)的變換結(jié)構(gòu),設(shè)計(jì)了性能比較好的漸變波導(dǎo)型8路和徑向波導(dǎo)腔型12路功率合成結(jié)構(gòu),并針對(duì)8路合成結(jié)構(gòu)進(jìn)行了加工測(cè)試。4.在放大器的電源模塊中加入了脈沖調(diào)制電路,以達(dá)到使放大器可以脈沖工作的目的,并將電路在Pspice中進(jìn)行了進(jìn)一步仿真。之后還設(shè)計(jì)了兩路電源電路為功率放大器供電。5.分析了鐵氧體隔離器的工作原理。利用鐵氧體的法拉第旋磁效應(yīng),設(shè)計(jì)了一款8mm波段鐵氧體環(huán)行器,并以此環(huán)行器為基礎(chǔ),設(shè)計(jì)了環(huán)行式鐵氧體隔離器,以加大放大鏈路之間以及固態(tài)功率放大器輸出端口與回旋行波管輸入端口之間的隔離度。6.分析了常用的增益均衡器的工作原理。利用加載有切比雪夫吸波材料的矩形諧振腔組成的陷波單元,針對(duì)回旋行波管的增益特性,設(shè)計(jì)了一款8mm波段的腔體增益均衡器,保證了回旋行波管高效穩(wěn)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.
【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】：2015
【分類號(hào)】：TN124;TN722.75

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