發(fā)布時(shí)間：2018-11-04 10:00

【摘要】：近年來,隨著通信行業(yè)的蓬勃發(fā)展,用戶數(shù)量急劇增加,通信鏈路的大規(guī)模建設(shè),使無源器件的使用十分普遍;與此同時(shí),由無源器件非線性而產(chǎn)生的無源互調(diào)(Passive Intermodulation,PIM)干擾也日益嚴(yán)重。無源互調(diào)產(chǎn)物一旦落入接收機(jī)的頻帶內(nèi),將嚴(yán)重影響系統(tǒng)的通信質(zhì)量,因此,如何降低無源互調(diào)干擾的問題越來越受到通信行業(yè)的關(guān)注,要降低通信系統(tǒng)中的無源互調(diào)干擾,對(duì)無源互調(diào)產(chǎn)生機(jī)理的研究非常必要,所以,對(duì)無源互調(diào)的研究具有一定的理論意義和實(shí)際意義。本文以矩形波導(dǎo)連接器為基礎(chǔ),對(duì)無源互調(diào)的產(chǎn)生機(jī)理進(jìn)行分析并建立無源器件兩級(jí)級(jí)聯(lián)模型。無源互調(diào)的產(chǎn)生機(jī)理主要有:材料非線性和接觸非線性,波導(dǎo)結(jié)處的接觸非線性是無源互調(diào)產(chǎn)生的常見原因之一,主要的非線性機(jī)理為接觸機(jī)理和半導(dǎo)體機(jī)理。接觸機(jī)理認(rèn)為,看似緊密接觸的兩個(gè)波導(dǎo)法蘭,從微觀上看,實(shí)際接觸只發(fā)生在粗糙平面的少數(shù)微凸體上,流過波導(dǎo)結(jié)的電流向接觸微凸體聚集時(shí)因?yàn)橥蝗皇湛s而產(chǎn)生非線性,導(dǎo)致無源互調(diào)的產(chǎn)生。半導(dǎo)體機(jī)理主要來源于波導(dǎo)結(jié)處的金屬-絕緣層-金屬(Metal-Insulator-Metal,MIM)結(jié)構(gòu),因?yàn)榭諝庋趸�、沾污等原因在法蘭表面形成一層納米級(jí)的絕緣層,形成MIM結(jié)構(gòu)。本文著重研究了半導(dǎo)體機(jī)理中的量子隧道效應(yīng)和熱電子發(fā)射效應(yīng),分析了兩個(gè)效應(yīng)中互調(diào)干擾的主要影響因素,及無源互調(diào)電流密度隨各因素的變化趨勢(shì);討論了在相同條件下,起主導(dǎo)作用的產(chǎn)生機(jī)理,對(duì)降低無源器件的互調(diào)干擾具有指導(dǎo)性意義。無源器件的大量使用,使一條通信鏈路中不止存在一個(gè)無源器件,針對(duì)目前無源器件級(jí)聯(lián)的普遍現(xiàn)象,本文將無源器件簡(jiǎn)化為波導(dǎo)結(jié),建立了兩級(jí)級(jí)聯(lián)模型。分析輸入載波信號(hào)連續(xù)經(jīng)過兩個(gè)波導(dǎo)結(jié)后,無源互調(diào)功率的變化,考慮到用于連接兩個(gè)波導(dǎo)結(jié)的傳輸線對(duì)輸入載波信號(hào)的相位有影響,研究了無源互調(diào)功率隨傳輸線相位長(zhǎng)度的變化規(guī)律,輸入載波信號(hào)的相位差與傳輸線相位長(zhǎng)度的關(guān)系,從而可以有效的避開無源互調(diào)功率累加最大值,達(dá)到降低無源互調(diào)干擾的目的。
[Abstract]:In recent years, with the rapid development of the communication industry, the number of users has increased dramatically, and the large-scale construction of communication links has made the use of passive devices very common. At the same time, passive Intermodulation (Passive Intermodulation,PIM) interference caused by the nonlinearity of passive devices is becoming more and more serious. Once the passive Intermodulation product falls into the frequency band of the receiver, it will seriously affect the communication quality of the system. Therefore, the problem of how to reduce the passive Intermodulation interference is paid more and more attention by the communication industry, and the passive Intermodulation interference in the communication system should be reduced. It is necessary to study the mechanism of passive Intermodulation, so the study of passive Intermodulation is of theoretical and practical significance. Based on the rectangular waveguide connector, the generation mechanism of passive Intermodulation is analyzed and a two-stage cascade model of passive devices is established. The generation mechanism of passive intermodulation mainly includes material nonlinearity and contact nonlinearity. Contact nonlinearity at waveguide junction is one of the common reasons of passive intermodulation. The main nonlinear mechanism is contact mechanism and semiconductor mechanism. According to the contact mechanism, the two waveguide flanges which appear to be in close contact with each other, from the microscopic point of view, only occur on a few microprotrusions in rough planes. When the current flowing through the waveguide junction accumulates to the contact protrusions, it is nonlinear because of the sudden contraction of the contact flanges. Resulting in passive Intermodulation. The semiconductor mechanism mainly comes from the metal-insulator-metal (Metal-Insulator-Metal,MIM) structure at the junction of the waveguide. Because of air oxidation and contamination, a layer of nanoscale insulating layer is formed on the flange surface to form a MIM structure. In this paper, the quantum tunneling effect and the hot electron emission effect in semiconductor mechanism are studied. The main influencing factors of the intermodulation interference in the two effects and the variation trend of passive Intermodulation current density with each factor are analyzed. Under the same conditions, the dominant mechanism is discussed, which is of guiding significance to reduce the intermodulation interference of passive devices. With the extensive use of passive devices, there is more than one passive device in a communication link. In view of the common phenomenon of cascading passive devices at present, the passive device is simplified as a waveguide junction and a two-stage cascade model is established. After the input carrier signal passes through two waveguide junctions continuously, the change of passive intermodulation power is analyzed, considering that the transmission line used to connect the two waveguide junctions has an effect on the phase of the input carrier signal. The relationship between the phase difference of the input carrier signal and the phase length of the transmission line is studied in order to avoid the accumulative maximum of the passive intermodulation power effectively. The aim of reducing passive Intermodulation interference is achieved.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN814

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