【正文】 standards, different working modes of a variety of systems coexist, to human life brought great convenience. It is hoped that not only a call can be made in a different place, but also the service of the non business service such as data and fax is required. These demand to promote the rapid development of mobile munication technology and the increasing frequency of munication, munication bandwidth increases, equipment use rapid renewal, the core ponent of the microwave power amplifier is also more and more high [12]. Broadband microwave power amplifier with low nonlinear distortion and good matching characteristics, bees a very important type of amplifiers in the modern wireless access technology and remote munication system. Over the past 10 years, phased array radar systems have developed rapidly in the field of military and civilian areas.. In recent years, phased array radar, especially active phased array radar, has been developed rapidly, and the main reason is that the radar performance is increasing.. Due to the microwave power amplifier in a radar system of heart function, and microwave power amplifier bee key ponents of the constraints of the system performance and the level of technology, the advantage of its performance will directly affect the quality of the whole system. 1 broadband microwave power amplifier matching circuit broadband microwave power amplifier input and output matching circuit for single stage power amplifier, mainly is the design of input matching circuit and an output matching circuit, and the design of multistage power amplifier need to design the stage matching circuit. In the power amplifier design, the input and output matching circuits are based on the specialSet the matching function and follow the different design principles. The input matching circuit is used to realize the matching between the amplifier input port and a signal source, it amplifier presents the plex impedance transform and signal source impedance conjugate matching, in order to obtain the maximum power gain matching. The input matching circuit mainly solves the problems such as stability, gain, gain flatness, input standing wave and so on.. The output matching circuit is used to plete the matching between the output port of the amplifier and the load, and the main function of the output matching circuit is to improve the output power, improve the output power, and suppress the harmonic of the output of the Bobbi. Thus, the gain and its flatness are mainly solved by the input, and the gain of the microwave transistor is pensated.. The input and output impedances of the microwave power amplifier are small, and only a few of the order of Ohm are. The input impedance is smaller and the imaginary part is changed with the frequency.. So the input impedance of microwave power amplifier is relatively large and the matching circuit is hard to design.. In the guarantee of the gain and its flatness, it is difficult to get smaller input in Bobbi, the broadband design is more prominent [3]. matching network main methods of the microwave power amplifier matching network are: lumped element method, distributed parameter method. Using distributed parameter method to achieve the impedance matching method mainly in the following three ways: (1) a quarter wavelength stepped impedance transformer。 third, microstrip low pass impedance filter impedance converter. 1/4 wavelength stepped impedance transformer usually requires impedance change ratio is less than 5, and the frequency range is not easy too wide, otherwise difficult to match. Taper microstrip line and microstrip low pass filter impedance converter two methods matching bandwidth is wide, small volume, especially microstrip lowpass filter impedance converter. It not only has the nature of the stepped impedance transformer, but also has the advantages of pact structure, large stop band attenuation to the dual role of filtering and impedance transformation. 附錄C : 由于無線通信的飛速發(fā)展,滿足不同需求的通信系統(tǒng)應(yīng)運而生，不同通信標(biāo)準(zhǔn)、不同工作模式的多種系統(tǒng)并存，給人類生活帶來極大的方便。這些需求促使移動通信技術(shù)高速發(fā)展,通信的頻率不斷提高, 通信的帶寬逐漸增加,使用的設(shè)備快速更新?lián)Q代，對于核心部件的微波功率放大器的要求也越來越高[12]。在過去的10 年里，相控陣?yán)走_系統(tǒng)在軍用和民用領(lǐng)域發(fā)展迅速。由于微波功率放大器在雷達系統(tǒng)中的心臟作用，因而微波功率放大器成為制約系統(tǒng)性能和技術(shù)水平的關(guān)鍵部件，其性能的優(yōu)勢將直接影響到整個系統(tǒng)的質(zhì)量。在功率放大器設(shè)計中，輸入和輸出匹配電路基于特定的匹配功能而遵循不同的設(shè)計原則。輸入匹配電路主要解決穩(wěn)定性、增益、增益平坦度、輸入駐波等問題。因此，增益及其平坦度的問題主要放在輸入端來解決，補償微波晶體管的自身增益滾降。其中輸入阻抗更小，而且虛部隨頻率變化較大。在保證增益及其平坦度的同時很難獲得較小的輸入駐波比，寬帶設(shè)計中此問題更加突出。利用分布參數(shù)法來實現(xiàn)阻抗匹配的方法主要有以下三種方法：①1/4 波長階梯阻抗變換器；②微帶漸變線阻抗變換器；③微帶低通阻抗濾波阻抗變換器。微帶漸變線和微帶低通濾波阻抗變換器兩種方法匹配帶寬比較寬，體積小，尤其是微帶低通濾波阻抗變換器，它不僅具有階梯阻抗變換器的性質(zhì)，而且結(jié)構(gòu)緊湊，阻帶衰減大，可起到濾波和阻抗變換雙重作