Flexible supporting cable for an electronic device and method of making same

A flexible supporting cable for an electronic device which comprises:

• stainless steel foil substrate;
• layer of polymer on selected portions of said substrate;
• circuit pads at selected locations on said layer of polymer, said circuit pads having a top side and bottom side and, wherein vias are provided in said steel foil substrate and layer of polymer beneath said pads so as to expose the bottom surfaces of said pads;
• circuit lines extending from the top side of said pads wherein a first window free from steel is provided beneath a portion of and including the extremities of said circuit lines;
• and
• wherein a second window, smaller than said first window, free from said steel and said layer of polymer is provided beneath a portion of said circuit lines and in the vicinity of the extremities of said circuit lines.