本文關(guān)鍵詞： 微波通信 高功率 無源互調(diào) 非線性失真 測試技術(shù)　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近幾年，隨著高功率、大容量、高靈敏度通信系統(tǒng)的發(fā)展和應(yīng)用，無源互調(diào)（Passive Intermodulation，簡稱PIM）問題作為一個(gè)技術(shù)難點(diǎn)而越來越得到人們的重視。無源互調(diào)本身是由無源器件的弱非線性特性引起的，，例如非線性電路特性和非線性電磁特性。在小信號(hào)條件下，無源非線性失真是可以忽略的。但是，在高功率條件下，原本可以忽略的無源弱非線性失真變得異常突出。通常，有源器件非線性產(chǎn)生的失真信號(hào)可以通過濾波技術(shù)消除在允許的范圍內(nèi)。然而，無源互調(diào)失真產(chǎn)物緊鄰工作頻率的特點(diǎn)使其可以落入工作頻帶內(nèi)。這成為了消除技術(shù)的難點(diǎn)所在。此外，無源互調(diào)往往還會(huì)出現(xiàn)在濾波器后面，因而是難以消除的。嚴(yán)重的失真不僅會(huì)降低接收機(jī)靈敏度、影響正常通信質(zhì)量，還會(huì)使整個(gè)系統(tǒng)惡化，甚至發(fā)生故障。無源互調(diào)產(chǎn)生的機(jī)理是錯(cuò)綜復(fù)雜的，往往是多種物理過程綜合作用的結(jié)果，因而人們往往憑經(jīng)驗(yàn)和行為模型來描述其背后的原因。 本文首先從無源非線性機(jī)理出發(fā)，闡述引起無源非線性的主要物理原因，數(shù)學(xué)模型以及分析方法。其次，以電熱效應(yīng)為背景，研究了印刷電路板上微帶線無源互調(diào)產(chǎn)生的機(jī)理。從物理機(jī)理和現(xiàn)象學(xué)兩個(gè)角度，分別利用兩種方程對(duì)微帶線無源互調(diào)產(chǎn)生、分布以及特點(diǎn)規(guī)律進(jìn)行研究。最后，利用現(xiàn)有儀器搭建了無源互調(diào)測試系統(tǒng)。當(dāng)輸入信號(hào)的功率為27dBm時(shí)，我們觀察到了比較明顯的三階互調(diào)信號(hào)。制作了多阻抗共面微帶板，對(duì)多個(gè)微帶板進(jìn)行了測試，重點(diǎn)研究了不同阻抗匹配情況、微帶線線長度與三階互調(diào)信號(hào)產(chǎn)生的關(guān)系，并基于電壓駐波原理，提出了一種短路線測量方法。實(shí)驗(yàn)測試證明，短路駐波能將電壓波腹點(diǎn)處的互調(diào)信號(hào)放大17dB以上。這將大大提高系統(tǒng)的測量動(dòng)態(tài)范圍，實(shí)現(xiàn)在相對(duì)較小的輸入功率下測試到相同大小的互調(diào)信號(hào)，大幅度降低互調(diào)測試對(duì)于輸入功率的要求。
[Abstract]:In recent years, with the development and application of high power, large capacity and high sensitivity communication systems, passive Intermodulation has been adjusted passively. As a technical difficulty, the problem of PIMs has been paid more and more attention. Passive Intermodulation is caused by the weak nonlinearity of passive devices. For example, nonlinear circuit characteristics and nonlinear electromagnetic characteristics. In small signal conditions, passive nonlinear distortion can be ignored. However, under high power conditions. The passive weak nonlinear distortion which can be neglected has become very prominent. Usually, the distortion signal generated by the nonlinear of active devices can be eliminated within the allowable range by filtering technique. The passive Intermodulation distortion products can fall into the working frequency band, which is the difficulty of the elimination technology. In addition, passive Intermodulation often appears behind the filter. Therefore, it is difficult to eliminate. Serious distortion will not only reduce the receiver sensitivity, affect the normal communication quality, but also make the whole system deteriorate or even fail. The mechanism of passive Intermodulation is complicated. It is often the result of a variety of physical processes, so people often use experience and behavior model to describe the reasons behind it. In this paper, the main physical reasons, mathematical models and analysis methods of the passive nonlinear are first expounded from the passive nonlinear mechanism. Secondly, the electrothermal effect is taken as the background. In this paper, the mechanism of passive intermodulation of microstrip lines on printed circuit board is studied. From the point of view of physical mechanism and phenomenology, two kinds of equations are used to produce passive intermodulation of microstrip lines. Finally, the passive intermodulation test system is built using the existing instruments. When the power of the input signal is 27dBm. We have observed the obvious third order intermodulation signal. We have made multi-impedance coplanar microstrip plate and tested several microstrip plates with emphasis on different impedance matching. The relationship between the length of the microstrip line and the generation of the third order intermodulation signal, and based on the principle of voltage standing wave, a short line measurement method is proposed. The short circuit standing wave can amplify the intermodulation signal at the voltage wave belly point by more than 17dB. This will greatly improve the dynamic range of the system and realize the measurement of the same size intermodulation signal at relatively small input power. The requirement of input power for Intermodulation testing is greatly reduced.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN972

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張世全,葛德彪;基于傅立葉級(jí)數(shù)法的互調(diào)產(chǎn)物一般特性分析[J];電波科學(xué)學(xué)報(bào);2005年02期

2 杜鄧寶;陽輝;宋健;;無源互調(diào)失真的數(shù)字化測量[J];電子測量與儀器學(xué)報(bào);2009年S1期

3 張文強(qiáng);年夫順;;無源互調(diào)測試系統(tǒng)的組建與分析[J];國外電子測量技術(shù);2012年05期

4 張輝;;波導(dǎo)法蘭連接的無源互調(diào)分析與測量[J];電子設(shè)計(jì)工程;2012年18期

5 萬運(yùn)強(qiáng);王成華;龔琳;尤文玨;;組合式無源互調(diào)自動(dòng)測試系統(tǒng)的設(shè)計(jì)[J];電子測量技術(shù);2012年11期

6 殷海成;;射頻電纜組件三階互調(diào)的研究與分析[J];光纖與電纜及其應(yīng)用技術(shù);2013年05期

7 李明德;無源交調(diào)干擾(PIMI)的產(chǎn)生與預(yù)防——射頻連接器低PIM設(shè)計(jì)[J];機(jī)電元件;2005年02期

8 鐘鷹;于飛;孫勤奮;;C波段衛(wèi)星天線無源互調(diào)的性能驗(yàn)證[J];空間電子技術(shù);2007年02期

9 王聰敏;王光明;張博;;基于冪級(jí)數(shù)法分析和計(jì)算MIM引起的無源互調(diào)功率電平[J];空軍工程大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年01期

10 張世全,葛德彪;通信系統(tǒng)無源非線性引起的互調(diào)干擾[J];陜西師范大學(xué)學(xué)報(bào)(自然科學(xué)版);2004年01期

本文編號(hào)：1447881