Abstract：This paper discusses the ferrite core attaching effect on pulse interference (GJB151A—1997 CS115/CS116 test wave) coupled in coaxial cable. A measuring system is set up according to practical situations, and the equivalent circuit of cable with ferrite core is analyzed, and the validation test is performed in time domain. The results show that ferrite core is good for suppressing pulse interference, and in high frequency its effect depends on the core positions on cable.
[1] GJB152A—1997, 中华人民共和国国家军用标准: 军用设备和分系统电磁发射和敏感度测量[S]. [2] Jitoh Y, Fujii K, Matsumoto Y, et al. Insertion loss measurement of a ferrite clamp used in the CISPR 22 radiated emission measurements[C]. IEEE Interna- tional Symp. on Electromagnetic Compatibility, Minneapolis, 2002: 6-11. [3] Lijun J, Yicheng Z, Xianggong Z, et al. Characteristic parameter analysis on the suppression VFTO in GIS by ferrite[C]. IEEE International Symp. on Electrical Insulating Materials, Kitakyshu, 2005: 825-828. [4] Urabe J, Fujii K, Matsumoto Y, et al. A study of EMI suppression characteristics of ferrite cores[C]. IEEE 17th International Symp. on EMC, Zurich, 2006: 622-625. [5] GJB151A—1997, 中华人民共和国国家军用标准:军用设备和分系统电磁发射和敏感度要求[S]. [6] Cerri G, Deleo R. ESD coupling to coaxial shielded cables[C]. 11th International Symp on EMC, Zurich, 1995: 629-634. [7] Fujiwara O, Ichkawa T, Kawada H. Effect of ferrite core attachment to coaxial cable on differential mode noise caused by braided shield current[C]. International Symp on EMC, Beijing, 1997: 523-526. [8] Samir A Z, Fujiwara O. Calculation of load effect produced by ferrite core attached to wire above a ground plane[C]. Asia Pacific Microwave Conference, 1999: 182-185. [9] Vance E F. Shielding effectiveness of braided-wire shields[J]. IEEE Transactions on Electromagnetic Compatibility, 1975: 71-77.
2009, Vol. 24 
