本文選題：水負(fù)載 + 匹配��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：隨著大功率微波在國內(nèi)外得到越來越多的關(guān)注和發(fā)展,大功率微波的測(cè)量也成為科研工作者所重點(diǎn)研究的對(duì)象。對(duì)于大功率微波,不可能使用常規(guī)的儀器進(jìn)行測(cè)量,通常利用微波功率計(jì)進(jìn)行測(cè)量。其中運(yùn)用較多的就是水負(fù)載大功率計(jì)。水負(fù)載大功率計(jì)不僅功率容量大而且其工作頻帶范圍較寬,再加上其體積小、結(jié)構(gòu)簡(jiǎn)單,通常放置于雷達(dá)發(fā)射機(jī)中的終端。同時(shí)它作為系統(tǒng)匹配負(fù)載來使用,是微波系統(tǒng)中的關(guān)鍵器件。目前國內(nèi)外對(duì)于寬頻帶大功率計(jì)的研究甚少,難以滿足微波系統(tǒng)發(fā)展的需求;窄帶大功率計(jì)在工作的頻率低的情況下,尺寸方面不太理想。針對(duì)這些情況,本文對(duì)兩種波導(dǎo)結(jié)構(gòu)水負(fù)載大功率計(jì)進(jìn)行了研制。主要工作內(nèi)容如下:首先,設(shè)計(jì)出一種超寬帶波導(dǎo)結(jié)構(gòu)水負(fù)載大功率計(jì),其頻率范圍為6.5GHz~18GHz,最大吸收功率為2KW,水負(fù)載波導(dǎo)部分外殼采用硬鋁,水室部分外殼采用不銹鋼,波導(dǎo)口斜切角度為3.2°,微波輻射口的介質(zhì)片的材料選取為介電常數(shù)9.3的高密度氧化鋁陶瓷基片(Al2O3),水的密封圈采用的是耐熱200度并且無毒防水好的丁腈橡膠O型圈;其次,設(shè)計(jì)出一種窄帶波導(dǎo)結(jié)構(gòu)水負(fù)載大功率計(jì),其頻率范圍為2.35GHz~2.55GHz,最大吸收功率為5KW,水負(fù)載外殼波導(dǎo)部分外殼采用硬鋁,水室部分采用不銹鋼,波導(dǎo)口斜切角度為10.5°,微波輻射口的介質(zhì)片的材料是介電常數(shù)為9.3的高密度氧化鋁陶瓷基片(Al2O3),水的密封圈采用的是丁腈橡膠O型圈;最后,對(duì)超寬帶波導(dǎo)結(jié)構(gòu)水負(fù)載在不同水溫下進(jìn)行測(cè)試,并提出兩種功率測(cè)試方案。其研制的主要技術(shù)難點(diǎn)有以下幾個(gè)方面:功率容量比較大、反射要盡可能的小(即駐波比盡可能的低)、仿真計(jì)算難度比較大且耗時(shí)較多、密封性能要好和工藝要求比較高等等。通過科研攻關(guān),已成功研制出超寬帶波導(dǎo)結(jié)構(gòu)水負(fù)載大功率計(jì),帶內(nèi)電壓駐波比小于1.2,最大功率容量達(dá)到2kW。同是窄帶波導(dǎo)結(jié)構(gòu)水負(fù)載大功率計(jì)也通過仿真得到了很好的優(yōu)化結(jié)果,帶內(nèi)電壓注波比小于1.06,遠(yuǎn)遠(yuǎn)小于指標(biāo)規(guī)定的1.15,正在進(jìn)行后期的加工和裝配工作。
[Abstract]:With the increasing attention and development of high-power microwave at home and abroad, the measurement of high-power microwave has become the focus of research. For high power microwave, it is not possible to use conventional instruments to measure, usually by microwave power meter. Among them, water load high power meter is used more. The water-loaded high-power meter is not only of large power capacity but also has a wide range of operating frequency band. In addition, it is small in size and simple in structure, so it is usually placed in the terminal of radar transmitter. At the same time, it is used as system matching load, and it is the key device in microwave system. At present, there is little research on broadband high-power meter at home and abroad, which is difficult to meet the needs of microwave system development, and narrow band high-power meter is not ideal in size when the frequency is low. In order to solve these problems, two kinds of water-loaded high power meters with waveguide structure are developed in this paper. The main work is as follows: firstly, a kind of ultra-wideband waveguide structure water-loaded high-power meter is designed, the frequency range is 6.5 GHz ~ (18 GHz), the maximum absorption power is 2 KW, the water-loaded waveguide shell is made of hard aluminum, and the water chamber part shell is stainless steel. The bevel angle of waveguide mouth is 3.2 擄, the material of microwave radiator dielectric slice is high density alumina ceramic substrate Al _ 2O _ 3 with dielectric constant 9.3, the sealing ring of water is heat-resistant 200 degrees and non-toxic waterproof nitrile rubber O ring; secondly, A water loaded high power meter with narrow band waveguide structure is designed. Its frequency range is 2.35 GHz ~ (2. 55 GHz) and the maximum absorption power is 5 KW. The shell of the water-loaded shell is made of hard aluminum, and the part of the water chamber is stainless steel. The angle of oblique cut of waveguide mouth is 10.5 擄, the material of dielectric slice of microwave radiator is high density alumina ceramic substrate Al _ 2O _ 3 with dielectric constant 9.3, the sealing ring of water is butadiene acrylonitrile rubber O-ring. The water load of UWB waveguide structure is measured at different water temperature, and two kinds of power measurement schemes are proposed. The main technical difficulties of its development are as follows: the power capacity is large, the reflection should be as small as possible (that is, the standing wave ratio is as low as possible, the simulation calculation is difficult and time-consuming, the sealing performance is good and the process requirement is high, etc.) Through scientific research, a water-loaded high-power meter with ultra-wideband waveguide structure has been successfully developed. The in-band voltage standing wave ratio is less than 1.2, and the maximum power capacity is 2 kW. The water load high power meter with narrow band waveguide structure is also optimized by simulation. The in-band voltage beam-wave ratio is less than 1.06, which is far less than 1.15 specified by the index, so it is being processed and assembled in the later stage.
【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】：2014
【分類號(hào)】：TM933.3

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