金属波导连接的无源互调非线性物理机制和计算方法

叶鸣 1; 贺永宁 1; 2; 王新波 2; 崔万照 2

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金属波导连接的无源互调非线性物理机制和计算方法

更新时间：2025-07-09

- 金属波导连接的无源互调非线性物理机制和计算方法
- Nonlinear Physical Mechanism and Calculation Method of Passive Intermodulation at Metal Waveguide Connection
- 西安交通大学学报 2011年45卷第2期页码：82-86
- 作者机构：
  
  西安交通大学电子与信息工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2010-05-26. 作者简介: 叶鸣(1985-),男,博士生;贺永宁(联系人),女,博士,副教授. 基金项目: 总装备部国防科技重点实验室基金资助项目(9140C5304020804)
- DOI：
  中图分类号： TN015
- 网络首发：2011-02-10，
  
  纸质出版：2011
- 稿件说明：
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叶鸣 1, 贺永宁 1, 2, 等. 金属波导连接的无源互调非线性物理机制和计算方法[J]. 西安交通大学学报, 2011,45(2):82-86.

Nonlinear Physical Mechanism and Calculation Method of Passive Intermodulation at Metal Waveguide Connection[J]. 2011, 45(2): 82-86.
叶鸣 1, 贺永宁 1, 2, 等. 金属波导连接的无源互调非线性物理机制和计算方法[J]. 西安交通大学学报, 2011,45(2):82-86. DOI：

Nonlinear Physical Mechanism and Calculation Method of Passive Intermodulation at Metal Waveguide Connection[J]. 2011, 45(2): 82-86. DOI：

摘要

针对大功率条件下金属波导连接的无源互调(PIM)难以预测的问题

提出了一种金属波导结的PIM非线性物理机制和计算方法.考虑到波导表面的粗糙度和薄介质层

将波导连接视为MIM(Metal-Insulator-Metal)结构并确立其粗糙表面接触模型和等效电路模型

然后依据MIM结构的导电机理将量子隧穿电流和热发射电流视作引起PIM的非线性根源

最后运用傅里叶变换计算各阶PIM功率.相比传统的幂级数方法

该方法能快速计算各阶PIM且无需进行参数拟合.以双载波条件下工作于TE

模式的铝质矩形波导为例进行仿真实验

结果表明:波导间接触压力越大

各阶PIM越小; PIM阶数越高

载波功率之比对其影响越大; 新方法预测的5、7、9阶PIM功率相对于载波功率的增长率约为2

比传统幂级数展开法估计的结果更符合实际.

Abstract

A novel method considering nonlinear conduction mechanism is proposed to calculate the passive intermodulation(PIM)at waveguide connection and to deal with the prediction difficulty of PIM under high power condition. By taking the fact into account that the surface of the waveguide is always rough and that there is usually a dielectric thin film on it

the waveguide connection is regarded as a metal-insulator-metal structure

and the rough surface contact model and the equivalent circuit model are given. Then

the quantum tunneling current and the thermionic emission current are assumed to be the main nonlinear sources of PIM across the real waveguide connection

and the PIM power levels are obtained with the aid of the Fourier Transformation. Compared with the conventional power series me

thod

the proposed method can compute any order of PIM rapidly without parameter fitting. Simulations on rectangular aluminum waveguide operating at TE

mode are performed. The results show that the PIM power have a lower level under heavier contact pressure; higher order PIM power have more dependence on the power ratio of the input power; and the growth rates for 5-

9- order PIMs power are all about 2

which is more realistic than the theoretical results from the classic power series method.

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references

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