本文關(guān)鍵詞： 無源互調(diào) 非線性電路 時(shí)域有限差分法 電熱耦合 分?jǐn)?shù)階微積分　出處：《西安電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著通信系統(tǒng)向著更大功率,更寬頻帶,更高靈敏度接收機(jī)的方向發(fā)展,無源互調(diào)逐漸成為不可忽視的重要問題。本文一方面以冪級(jí)數(shù)模型和等效電路模型為基礎(chǔ),通過時(shí)域有限差分法對金屬-金屬接觸的無源互調(diào)問題做了研究;另一方面從電熱耦合著手,研究了電熱耦合對無源互調(diào)的影響。本文的主要工作如下:1.基于金屬-金屬非線性接觸的兩種模型——冪級(jí)數(shù)模型和接觸等效電路模型,通過時(shí)域有限差分法來分析這兩種模型的無源互調(diào)問題。用時(shí)域有限差分法先計(jì)算出通過金屬-金屬接觸的非線性電流,再將計(jì)算得到非線性電流作為一個(gè)非線性源來計(jì)算遠(yuǎn)場的散射場,最后通過Friis傳輸方程計(jì)算得到由金屬-金屬接觸產(chǎn)生的無源互調(diào)問題。通過實(shí)例仿真驗(yàn)證時(shí)域有限差分法應(yīng)用于金屬-金屬非線性接觸無源互調(diào)分析的正確性。2.微波負(fù)載作為常見的微波器件,用來改善電路的匹配性能,吸收微波能量。微波負(fù)載因消耗微波能量產(chǎn)生的焦耳熱會(huì)影響微波負(fù)載的電阻率,出現(xiàn)非線性的電壓-電流關(guān)系,從而導(dǎo)致無源互調(diào)的產(chǎn)生。而熱場與電磁場耦合時(shí)導(dǎo)致時(shí)間尺度上的差異,是分析電熱耦合無源互調(diào)的主要問題。為了分析微波負(fù)載的電熱耦合無源互調(diào)問題,首先利用分?jǐn)?shù)階微分建立了微波負(fù)載分?jǐn)?shù)階熱傳導(dǎo)模型;再根據(jù)分?jǐn)?shù)階熱傳導(dǎo)模型建立了分?jǐn)?shù)階熱傳導(dǎo)的電路模型;最后結(jié)合熱阻效應(yīng),推導(dǎo)出微波負(fù)載電熱耦合引起的無源互調(diào)功率電平表達(dá)式。分析了材料的電阻溫度系數(shù)、熱阻、熱容對無源互調(diào)的影響,為微波負(fù)載降低電熱耦合引起的無源互調(diào)提供了參考。3.通過已經(jīng)建立的模型,用MATLAB的GUI模塊建立參數(shù)化圖形界面,集成為一個(gè)可以計(jì)算接觸非線性和電熱耦合引起無源互調(diào)問題的軟件,實(shí)現(xiàn)了模型的參數(shù)化及圖形界面操作。
[Abstract]:With the development of communication system towards greater power, wider frequency band, high sensitivity receiver direction, passive intermodulation has gradually become an important issue can not be ignored. This article is based on the power series model and equivalent circuit model of the metal metal contact through the finite difference time domain method to do the research of passive intermodulation on the other hand; starting from the coupling effect of electric heating, electrothermal coupling of passive intermodulation. The main work of this paper are as follows: 1.. Based on two kinds of power series model and contact model of equivalent circuit model of metal nonlinear contact, the finite difference time domain method for the analysis of passive intermodulation in these two models. To calculate the nonlinear current through the metal metal contact with finite difference time domain method, and then calculate the nonlinear current as a nonlinear source to calculate the scattered field in the far field, and finally through the Fr The calculated passive intermodulation generated by metal to metal contact problems. To correct the transmission equation of IIS.2. microwave metal metal contact nonlinear analysis of passive intermodulation load as microwave devices common simulation examples verify the time-domain finite difference method, used to improve the matching performance of the circuit, the absorption of microwave energy. The microwave load due to Joule heat consumption the microwave energy generated will affect the resistivity of microwave load, nonlinear current voltage relationship, resulting in passive intermodulation. While the thermal field coupling and electromagnetic field resulted in different time scales, is the analysis of the main problems of electric coupling. For the problem of passive intermodulation intermodulation analysis of microwave passive electro thermal load, using the first fraction a microwave load differential fractional heat conduction model; then the fractional heat conduction of electricity is established based on the fractional heat conduction model The road model; finally, the thermal resistance effect, deduces the microwave load caused by the thermal coupling of passive intermodulation power level expression. Analysis of the temperature coefficient of resistance material, thermal resistance, heat capacity of passive intermodulation, microwave passive electric load decrease coupling caused by intermodulation references.3. has been established through the establishment of model, parametric graph interface with GUI MATLAB module, integrated into one can calculate the nonlinear contact and electric coupling problem caused by passive intermodulation software, realize the model parameterization and the graphical interface.

【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM132

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 Jiang Jie;Li Tuanjie;Ma Xiaofei;Wang Pei;;A nonlinear equivalent circuit method for analysis of passive intermodulation of mesh reflectors[J];Chinese Journal of Aeronautics;2014年04期

2 吳欣欣;;同軸電纜中三階互調(diào)的產(chǎn)生及其測量[J];有線電視技術(shù);2009年08期

3 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

4 鳳衛(wèi)鋒;通信系統(tǒng)中無源互調(diào)失真的測量[J];航空計(jì)測技術(shù);2003年03期

5 張世全,葛德彪,傅德民;冪級(jí)數(shù)法對無源交調(diào)幅度和功率的預(yù)測[J];西安電子科技大學(xué)學(xué)報(bào);2002年03期

6 張世全,傅德民,葛德彪;無源互調(diào)干擾對通信系統(tǒng)抗噪性能的影響[J];電波科學(xué)學(xué)報(bào);2002年02期

，

本文編號(hào)：1513647