High Quality Content by WIKIPEDIA articles! In geometry, coaxial means that two or more forms share a common axis; it is the three-dimensional linear analogue of concentric. Coaxial cable, as a common example, has a wire conductor in the centre (D) a circumferential outer conductor (B) and an insulating medium called the dielectric (C) separating these two conductors. The outer conductor is usually sheathed in a protective PVC outer jacket (A). The dimension and material of the conductors and insulation determine the cables characteristic impedance and attenuation at various frequencies.

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