Phase matching is a term generally used to describe two or more cable assemblies with the same phase length. A more precise term is electrical length matching since phase measurements are from 0° to 360° of phase, with repeating cycles of 360° phase. The mechanical lengths of phase matched cable may not always be equal due to slight variations in the cable velocity of propagation. There are two distinctly different versions of phase matching: 1) Absolute phase matched cables are matched to a predetermined phase value, and 2) Relative phase matched cables are matched to each other. In either case, the tolerance of phase matching is frequency dependent although cable length and type may effect the matching capabilities.

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