中国空间科学技术

中国空间科学技术 ›› 2021, Vol. 41 ›› Issue (1): 100-105.doi: 10.16708/j.cnki.1000-758X.2021.0012

• 技术交流 • 上一篇    下一篇

大功率微波部件多载波无源互调分析与实验验证

魏焕，王新波，白鹤，崔万照   

  1. 中国空间技术研究院西安分院空间微波技术重点实验室，西安710100
  • 出版日期:2021-02-25 发布日期:2021-02-02

Analysis and experiment on multicarrier passive intermodulation in high power component

WEI Huan, WANG Xinbo, BAI He, CUI Wanzhao   

  • Published:2021-02-25 Online:2021-02-02

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摘要： 无源互调是通信系统不可避免的问题，随着卫星载荷技术向更高功率、宽频段、高灵敏度接收方向发展，无源互调对通信系统造成的影响更加严重。常用的双载波分析评价无源互调已经不能适用于现代复杂载荷通信系统，提出确定多载波无源互调分布类型分析与计算方法，采用非线性模型计算多载波无源互调功率电平。通过对TNC双阴连接器的分析计算可得到接收频带内产生3个互调频率点，对比非线性模型计算的互调功率电平与多载波实验测量的互调功率电平，3个互调频率点最大误差小于5dB。分析方法有助于大功率微波部件多载波无源互调分析，可为多载波无源互调测量提供参考和依据。

关键词: 大功率微波部件, 无源互调, 多载波, 分布类型, 非线性模型, 功率电平

Abstract: Passive intermodulation (PIM) is an inevitable problem in communication systems and is becoming much more serious with characteristics of higher power, wider bandwidth and higher receiving sensitivity of satellite payload. The common method of double carriers for analyzing PIM has been unfit for modern communication systems with complex payload. The proposed analysis and algorithm for multicarrier is an effective way to solve multicarrier passive intermodulation interference, using nonlinear modal of PIM to forecast power level. Analysis and calculation on TNC-KK connector show that three intermodulation frequencies were generated in the receiving frequency band. Comparing the intermodulation power level calculated by the nonlinear model with that measured by the multicarrier experiment, the max error among the three intermodulation frequencies was less than 5dB. The analysis method is beneficial for multicarrier passive intermodulation of high power microwave components and can provide reference for the measurement of multicarrier passive intermodulation.

Key words: high power component, passive intermodulation, multicarrier, distribution type,  , nonlinear model, power level