Models and measurement methods

for shielded cables and cylindrical shields

Computational models for coaxial cables and couplings of interest in electromagnetic compatibility, based on the idea of transfer impedance and transfer admittance, are well known. We have introduced some new concepts and results concerning such models applicable to coaxial cables and multiconductor shielded cables.

We are presenting our first two papers on these questions, which appeared in 1993 in the *IEEE Transactions on EMC*.

[B20] F. Broydé, E. Clavelier, "Comparison of Coupling Mechanisms on Multiconductor Cables", *IEEE Transactions on EMC*, Vol. 35, No. 4, November 1993, pp. 409-416.

[B21] F. Broydé, E. Clavelier, D. Givord, P. Vallet, "Discussion of the Relevance of Transfer Admittance and Some Through Elastance Measurements Results", *IEEE Transactions on EMC*, Vol. 35, No. 4, November 1993, pp. 417-422.

The first paper [B20] studies the couplings between external electric and magnetic fields, and multiconductor cables, and introduces the idea of considering 5 couplings for each conductor. This is therefore a much more detailed analysis than the one based on considering the cable as characterized by a single transfer impedance.

The second paper [B21] investigates electrical couplings on a coaxial cable, related measurement errors, and shows experimental results. Up to then, there was no experimental result published on this question.

Measurements of the parameters that we had defined then became necessary. Some measurement techniques and results are presented in the following paper.

[B31] F. Broydé, E. Clavelier, "Definition, Relevance and Measurements of the Parallel and Axial Transfer Impedances", *proceedings of the 1995 IEEE International Symposium on EMC*, Atlanta, August 1995, pp. 490-495.

We then started the creation of a theory allowing to rigorously demonstrate these results and to generalize them to the most general cylindrical structures. The basis of this theory, which requires more involved mathematics, is introduced in the following articles.

[B47] F. Broydé, E. Clavelier, "The Basis of a Theory for the Shielding by Cylindrical Generalized Screens", *IEEE Transactions on EMC*, Vol. 42, No. 4, November 2000, pp. 414-426.

[B53] F. Broydé, E. Clavelier, "Characterization of a Cylindrical Screen for External Excitations and Application to Shielded Cables", *IEEE Transactions on EMC*, Vol. 44, No. 4, November 2002, pp. 580-588.

A thorough presentation of the theory and of the experimental results can be found in the following thesis:

[B57] F. Broydé, *Analyse des propriétés électromagnétiques des écrans cylindriques, et application à la caractérisation de l'efficacité de blindage des câbles*, Ph.D. thesis presented at the Université des Sciences et Technologies de Lille, France, on June 16, 2004.

## Back to the home page |
## Back to the Club Excem |

URL : http://www.eurexcem.com/cluba/cablin-a.htm | © Excem 2000, 2009 |

Last update: June 12, 2009 | reply to: webmaster@eurexcem.com |