Passive Intermodulation of Metal Point Contact Structure Based on Electrothermal Coupling Effect

doi:10.7652/xjtuxb201809010

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Passive Intermodulation of Metal Point Contact Structure Based on Electrothermal Coupling Effect

更新时间：2025-05-01

- Passive Intermodulation of Metal Point Contact Structure Based on Electrothermal Coupling Effect
- Vol. 52, Issue 9, Pages: 76-81+117(2018)
- 作者机构：
  
  1. 西安交通大学电子与信息工程学院,西安,710049
  2. 西安空间无线电技术研究所,西安,710100
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201809010
  CLC： TN911.7
- Online First：10 September 2018，
  
  Published：2018
- 稿件说明：
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Passive Intermodulation of Metal Point Contact Structure Based on Electrothermal Coupling Effect[J]. 2018, 52(9): 76-81+117.
DOI：

Passive Intermodulation of Metal Point Contact Structure Based on Electrothermal Coupling Effect[J]. 2018, 52(9): 76-81+117. DOI： 10.7652/xjtuxb201809010.

摘要

针对现有无源互调(PIM)模型不能准确解释互调机理并描述测试规律的问题

提出了一种基于电热耦合效应的PIM产生机理和模型

并利用金属单点接触结构进行了实验验证。首先

提出了一种基于缝隙波导近场耦合的PIM测试方法

该方法使待测结构与测试工装分离

克服了传统PIM实验研究针对整体微波部件进行测试分析的限制

能够实现单个点接触结构的PIM效应研究; 然后

对铝接触在不同状态下的表面成分和电接触特性进行研究

结果表明

金属表面存在的氧化层和沾污物是引起其接触结PIM产生与劣化的根本原因

微波辐照时电热耦合效应影响接触结的阻抗; 最后

通过实验获取了铝、紫铜和黄铜等材料组成的单点接触结构的PIM。实验和理论结果表明

相对于传统的数学经验模型或多项式数学拟合

结合电热耦合的接触非线性模型从物理底层出发

对PIM的产生根源和机理给出了明确解释

能够更加准确地计算和预测PIM。

Abstract

A passive intermodulation(PIM)model based on electrothermal coupling effect is proposed to address the problem that current PIM model cannot explain the PIM mechanism and describe the experimental rules accurately. This model is further verified experimentally by using a metal point contact structure. First

a near-field coupling PIM measurement method based on waveguide slot is established

which makes the device under test(DUT)separate with the test equipment. This method overcomes the restriction in traditional PIM experimental research for measuring the whole microwave components

and realizes the research on the PIM effect of metal point contact structure. Then

the surface composition and the electrical contact characteristics of an aluminum metal point contact structure are investigated by EDX and I-V characteristics test

respectively. The results show that the oxidation and contamination existing on the metal surface dominates the PIM generation and degradation of metal contact. Moreover

the electrothermal coupling effect in microwave stimulating is proved to have significant impact on the contact impedance. Finally

a PIM model based on electrothermal coupling effect is proposed and verified by the experimental tests on metal point contact structures made of aluminum

brass and copper. Theoretical and experimental results show that

compared with the traditional empirical model or polynomial model

the proposed nonlinear contact model based on electrothermal coupling effect can improve the PIM calculation and prediction dramatically by giving a clear explanation of PIM's origin and mechanism.

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references

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