非线性电路求解及电热耦合分析

发布时间：2018-02-15 18:54

本文关键词： 无源互调非线性电路时域有限差分法电热耦合分数阶微积分　出处：《西安电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着通信系统向着更大功率,更宽频带,更高灵敏度接收机的方向发展,无源互调逐渐成为不可忽视的重要问题。本文一方面以幂级数模型和等效电路模型为基础,通过时域有限差分法对金属-金属接触的无源互调问题做了研究;另一方面从电热耦合着手,研究了电热耦合对无源互调的影响。本文的主要工作如下:1.基于金属-金属非线性接触的两种模型——幂级数模型和接触等效电路模型,通过时域有限差分法来分析这两种模型的无源互调问题。用时域有限差分法先计算出通过金属-金属接触的非线性电流,再将计算得到非线性电流作为一个非线性源来计算远场的散射场,最后通过Friis传输方程计算得到由金属-金属接触产生的无源互调问题。通过实例仿真验证时域有限差分法应用于金属-金属非线性接触无源互调分析的正确性。2.微波负载作为常见的微波器件,用来改善电路的匹配性能,吸收微波能量。微波负载因消耗微波能量产生的焦耳热会影响微波负载的电阻率,出现非线性的电压-电流关系,从而导致无源互调的产生。而热场与电磁场耦合时导致时间尺度上的差异,是分析电热耦合无源互调的主要问题。为了分析微波负载的电热耦合无源互调问题,首先利用分数阶微分建立了微波负载分数阶热传导模型;再根据分数阶热传导模型建立了分数阶热传导的电路模型;最后结合热阻效应,推导出微波负载电热耦合引起的无源互调功率电平表达式。分析了材料的电阻温度系数、热阻、热容对无源互调的影响,为微波负载降低电热耦合引起的无源互调提供了参考。3.通过已经建立的模型,用MATLAB的GUI模块建立参数化图形界面,集成为一个可以计算接触非线性和电热耦合引起无源互调问题的软件,实现了模型的参数化及图形界面操作。
[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.

【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM132

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