High speed data transmission cable and method of forming same

A high speed data transmission cable comprising:

• a pair of primary cables positioned adjacent to each other along their lengths;
• each primary cable including a pair of generally parallel conductors which are coupled together by an insulation structure;
• the insulation structure having a cross-section including circular end portions wherein each end portion is defined by a center point and a radius dimension, the conductors positioned proximate the center points of the circular end portions;
• the circular end portions being coupled together by a center portion, the center portion having cross-sectional height dimension reflective of the radius dimension of the end portions such that the insulation structure cross-section has generally flat top and bottom surfaces;
• a shield layer surrounding each primary cable along its length to isolate the primary cables from each other;
• the primary cables and corresponding shield layers being twisted together around a center axis located between the primary cables and forming a double helical structure;
• thereby providing improved transmission characteristics in the high speed data transmission cable.