Balanced multi-trace transmission in a hard disk drive flexure

A flexure comprising:

• a base metal layer, the base metal layer having a plurality of windows serially arranged along a longitudinal axis of the flexure, each window between a first lateral side of the base metal layer and a second lateral side of the base metal layer, the windows defined by a first inner edge of the first lateral side and a second inner edge of the second lateral side;
• a dielectric material layer having a first side and a second side opposite the first side, the first side of the dielectric material layer disposed against the base metal layer;
• a plurality of coplanar traces extending along the second side of the dielectric material layer in an array, each trace of the plurality of traces overlapping the plurality of windows, the plurality of traces comprising a pair of outer traces respectively located on lateral ends of the array and at least one inner trace between the pair of outer traces, wherein all adjacent traces of the plurality of traces are spaced a first distance from each other, the pair of outer traces are respectively spaced a second distance from the first and second inner edges, and the first distance is greater than or equal to the second distance;
• wherein the array is configured such that, when the plurality of traces conduct current, adjacent traces of the plurality of traces capacitively couple to each other and the pair of outer traces capacitively couple to each other through the first and second lateral sides and the base metal layer;
• and
• wherein the plurality of traces are interleaved such that, when the plurality of traces conduct current, adjacent traces have opposite polarities and the plurality of traces have equal electromagnetic wave propagation rates.