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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (6): 327053-327053.doi: 10.7527/S1000-6893.2022.27053

• Electronics and Electrical Engineering and Control • Previous Articles     Next Articles

Coupling mechanism between bulk current injection probe and airborne shielded cable

Hongxu ZHAO, Haiyang SHEN, Ye CHEN, Xudong SHI()   

  1. College of Electronic Information and Automation,Civil Aviation University of China,Tianjin 300300,China
  • Received:2022-02-18 Revised:2022-04-06 Accepted:2022-07-13 Online:2023-03-25 Published:2022-07-21
  • Contact: Xudong SHI E-mail:xdshi@cauc.edu.cn
  • Supported by:
    National Natural Science Foundation of China(51377161);Aeronautical Science Foundation of China(20182667010)

Abstract:

The Bulk Current Injection (BCI) method is the standard test method for conducted immunity test of airborne equipment. Exploring the coupling mechanism between the BCI injection probe and the interconnecting cable of airborne equipment is very important to further expand the conducted immunity test capability. However, there is barely comprehensive analytical model to describe the coupling mechanism between the injection probe and the shielded cable. Firstly, a lumped parameter model is established according to the structural characteristics of the injection probe, and the relative permeability and parasitic parameters such as inductance and capacitance are obtained by measuring the reflection coefficient with open-circuit termination. The equivalent circuit of the injection probe is constructed according to Thevenin's theorem. Then, according to the spatial structure relationship between the injection probe and the shielded cable, the coupling and uncoupling sections are defined, and the respective chain-parameter equations are established and cascaded to gain the overall chain-parameter equation. Finally, the coupling analytical model of the BCI injection probe and the shielded cable is formed based on the termination equations. At the same time, the scattering parameters of the multi-port network formed by the injection probe and the shielded cable are tested based on the experimental platform. The accuracy of the analytical model is verified by comparing the terminal coupling voltage of the shielded cable. The results show that the error between the model and the experimental results is less than 3 dB from low frequency to resonance point, and the model can effectively describe the coupling mechanism between the injection probe and the shielded cable.

Key words: Bulk Current Injection (BCI), shielded cable, lumped parameter, chain-parameter, transmission line theory

CLC Number: