外文翻譯---微波低噪聲放大器分析

1、<p>　　Microwave low noise amplifier analysis</p><p>　　Microwave is the development of the wireless communication and development is not divided. 1901 years MaKeNi use 800 KHz medium-wave signals from Br

2、itain to the world of the north American Newfoundland first trans-atlantic radio communication test, a new era of human wireless communication. Wireless communication at the initial stage, people use long wave spread to

3、communication. The 1920 s people discovered the shortwave communication, until the 1960 s, the rise of satellite communications, it </p><p>　　In recent years, microwave communication systems have been huge d

4、evelopment, thus result in microwave rf circuit performance had very great progress. And all kinds of communication system is the most critical circuit is one of the amplifier. Due to the development of semiconductor tec

5、hnology in the development of the amplifier is very quickly. In recent years many use microwave appeared hybrid integrated technology and single piece of microwave integrated technology of the production process of </

6、p><p>　　At present the microwave broadband low noise amplifier development direction of basically has two, one is to develop all kinds of power semiconductor devices, in the new type of semiconductor materials

7、and active device based on a thorough investigation, mainly focus on the working frequency of active components, gain, and power density, output power capacity of the improved; On the other hand is all kinds of high effi

8、ciency, high power, microwave/millimeter wave broadband amplifier circuit of b</p><p>　　With the height of the development of computer technology, applied to the bo circuit design simulation software also em

9、erge in endlessly. From the simple calculating function to the circuit simulation development now until recently electromagnetic fields mix simulation function, simulation software design ability is also been gradually s

10、trengthened. Microwave circuit simulation software launch and perfect, in the design of the amplifier to reduce artificial of calculation and improve the design </p><p><b>　　翻譯 ：</b></p>&

11、lt;p>　　微波低噪聲放大器分析</p><p>　　微波的發(fā)展是與無線通信的發(fā)展是分不開的。1901年馬克尼使用800KHz中波信號進(jìn)行了從英國到北美紐芬蘭的世界上第一次橫跨大西洋的無線電波的通信試驗(yàn)，開創(chuàng)了人類無線通信的新紀(jì)元。無線通信初期，人們使用長波及中波來通信。20 世紀(jì)20年代初人們發(fā)現(xiàn)了短波通信，直到20世紀(jì)60年代衛(wèi)星通信的興起，它一直是國際遠(yuǎn)距離通信的主要手段，并且對目前的應(yīng)急和軍事通信

12、仍然很重要。用于空間傳輸?shù)碾姴ㄊ且环N電磁波其傳播的速度等于光速。無線電波可以按照頻率或波長來分類和命名我們把頻率高于300MHz的電磁波稱為微波。由于各波段的傳播特性各異，可以用于不同的通信系統(tǒng)。例如，中波主要沿地面?zhèn)鞑?，繞射能力強(qiáng)，適用于廣播和海上通信。而短波具有較強(qiáng)的電離層反射能力，適用于環(huán)球通信。超短波和微波的繞射能力較差，可作為視距或超視距中繼通信。微波通信是二十世紀(jì)50年代的產(chǎn)物。由于其通信的容量大而投資費(fèi)用?。s占電纜投資的

13、五分之一），建設(shè)速度快，抗災(zāi)能力強(qiáng)等優(yōu)點(diǎn)而取得迅速的發(fā)展。20世紀(jì)40年代到50年代產(chǎn)生了傳輸頻帶較寬，性能較穩(wěn)定的微波通信，成為長距離大容量地面干線無線傳輸?shù)闹饕侄?，模擬調(diào)頻傳輸容量高達(dá) 2700 路，</p><p>　　近年來，微波通信系統(tǒng)得到了極大的發(fā)展，進(jìn)而導(dǎo)致了微波射頻電路的性能有了非常大的進(jìn)步。而各種通信系統(tǒng)中最關(guān)鍵的電路之一就是放大器。由于半導(dǎo)體技術(shù)的發(fā)展導(dǎo)致放大器的發(fā)展極為迅速。近年來出現(xiàn)了多

14、種使用微波混合集成技術(shù)和單片微波集成技術(shù)工藝制作的性能優(yōu)越的放大器。</p><p>　　目前微波寬帶低噪聲放大器的發(fā)展方向主要有兩個，一個是發(fā)展各類功率半導(dǎo)體器件，在對新型的半導(dǎo)體材料及有源器件進(jìn)行深入研究的基礎(chǔ)上，主要側(cè)重于有源器件的工作頻率、增益、功率密度、輸出功率容量的提高；另一方面是各類高效率、高功率、微波/毫米波寬帶放大電路的基礎(chǔ)理論研究，著重研究高效率、高功率、超寬帶放大電路的拓?fù)浣Y(jié)構(gòu)，研究擴(kuò)展放大

15、電器帶寬、增益帶寬積、功率帶寬積以及增益、效率和輸出功率等的提高方法和途徑。</p><p>　　隨著計(jì)算機(jī)技術(shù)的高度發(fā)展，應(yīng)用于微博電路設(shè)計(jì)的仿真軟件也層出不窮。從最初簡單的計(jì)算功能發(fā)展到現(xiàn)在的電路仿真直至最近的電磁場混合仿真的功能，仿真軟件的設(shè)計(jì)能力也是得到逐步加強(qiáng)。微波電路仿真軟件的推出和完善，對于在放大器設(shè)計(jì)中減少人工計(jì)算量，提高設(shè)計(jì)精度，簡化設(shè)計(jì)過程，縮短產(chǎn)品的研制周期起到了非常完善的作用。有源仿真軟件