Patent 7928320 was granted and assigned to Nexans on April, 2011 by the United States Patent and Trademark Office.
A helically-wound electric cable having at least two groups wound together so as to form a group helix. Each group has at least two twisted-together conductor wires, wherein the pitch of the group helix varying along the helically-wound electric cable in accordance with a sinusoidal function between two limit values having the same sign, characterized in that said sinusoidal function has a determined modulation period (MP) in order to avoid return loss peak (RLp) in the operating frequency range (Fmin-Fmax) of said helically-wound electric cable.