Experimental Analysis and Modelling of Coaxial Transmission Lines with Soft Shield Defects

Hossein Manesh (1) , Abelin Kameni (1) , Florent Loete (1) , Jérôme Genoulaz (2) , Lionel Pichon (1) , Odile Picon (3)

1 GeePs - Laboratoire Génie électrique et électronique de Paris
2 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
3 ESYCOM - Electronique, Systèmes de communication et Microsystèmes

Significant research has focused on the diagnosis of “hard” faults (open and short circuits) in transmission lines, but there has been much less work on “soft” faults resulting from a very small change in line impedance. This research is based on one type of soft fault problems in electrical fault diagnosis; the impacts of partial degradation in the coaxial cable shielding or other shielded lines. At first, using classical transmission-line equations in the frequency domain, analytical expressions are derived to infer the impact of the very small discontinuities in transmission lines. Then, this paper illustrates the real experimental measurement cases of faulty shields on coaxial cable. The experimental studies of fault length effects are presented in frequency and time domain measurements by referring to a coaxial cable transmission line designed for high frequency signal transmission in aircraft radio communication systems. Finally, numerical simulation of the experimental case is presented and then validated against the measurement result by using a data processing technique based on time domain analysis.

Mots clés: modeling; Transmission lines; soft defects; reflectometry; Fault diagnosis; cable shielding; coaxial cables; frequency-domain reflectometry; soft faults; wire faults; aerospace wiring

Domaines: Electromagnétisme

Hossein Manesh, Abelin Kameni, Florent Loete, Jérôme Genoulaz, Lionel Pichon, et al.. Experimental Analysis and Modelling of Coaxial Transmission Lines with Soft Shield Defects. Joint IEEE International Symposium on Electromagnetic Compatibility and EMC Europe, Aug 2015, Dresden, Germany. ⟨10.1109/ISEMC.2015.7256406⟩. ⟨hal-01235557⟩