Shielded cables with optimal braided shields [Geschirmte Kabel mit optimalen Geflechtschirmen]

Technical Report · Thu Jan 24 04:00:00 EST 1991

DOI:https://doi.org/10.2172/7796432· OSTI ID:7796432

Homann, Erich ^[1]

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1. Rheinische Draht- und Kabelwerke, Koeln-Riehl (Germany)

Extensive tests were done in order to determine what factors govern the design of braids with good shielding effectiveness. The results are purely empirical and relate to the geometrical relationships between the braid parameters. The influence of various parameters on the shape of the transfer impedance versus frequency curve were investigated step by step. It was found that the optical coverage had been overestimated in the past. Good shielding effectiveness results not from high optical coverage as such, but from the proper type of coverage, which is a function of the braid angle and the element width. These dependences were measured for the ordinary range of braid angles (20-40°). They apply to all plaiting machines and all gages of braid wire. The design rules are largely the same for bright, tinned, silver-plated and even lacquered copper wires. A new type of braid, which has marked advantages over the conventional design, was proposed. With the "mixed-element'' technique, an optimal braid design can be specified on any plaiting machine, for any possible cable diameter, and for any desired angle. This is not possible for the conventional type of braid.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Rheinische Draht- und Kabelwerke, Koeln-Riehl (Germany)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7796432
• Report Number(s): ALS/TR--91-002; ON: DE91011303
• Country of Publication: United States
• Language: English

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