面向卫星通信的内导体非接触同轴接头设计方法

Design method of coaxial connector with noncontact inner conductors for satellite communication

摘要:

针对无源互调(PIM)严重影响卫星通信系统性能和稳定性问题，提出了一种利用内导体非接触式结构实现低PIM的同轴接头设计方法。设计并实现了2款分别工作在S波段和C波段的内导体非接触式同轴接头：S波段的内导体非接触式同轴接头在2.1~2.7 GHz下实测|S₁₁|<-30 dB，通带内插入损耗小于0.3 dB；C波段的内导体非接触式同轴接头在3.5~4.2 GHz下实测|S₁₁|<-30 dB，通带内插入损耗小于0.2 dB。该改进型同轴接头设计方法为卫星通信系统的微波连接器的设计提供了重要的参考价值和新的研究思路。

Abstract:

A design method of low Passive Intermodulation(PIM) coaxial connectors using noncontact inner conductors is proposed in this paper. Coaxial connectors are widely used in satellite communication systems, and their PIMs seriously affect the communication performance. Two coaxial connectors with noncontact inner conductors in S-band and C-band are designed and implemented, respectively. The measured |S₁₁| of the proposed coaxial connectors is less than -30 dB from 2.1 GHz to 2.7 GHz in S band, and the insertion loss is better than 0.3 dB. The measured |S₁₁| of the C band connector is less than -30 dB from 3.5 GHz to 4.2 GHz, and the insertion loss is better than 0.2 dB. The proposed coaxial connector design method with noncontact inner conductors may lower the PIM of a coaxial connector and has bright future applications in satellite communication systems.