A coaxial cable may include an inner conductor, an outer conductor and a dielectric material layer therebetween. The inner conductor may include a tubular bimetaliic layer and may have a pair of opposing longitudinal edge portions at a longitudinal seam. The tubular bimetallic layer may include an inner metal layer and an outer metal layer bonded thereto and coextensive therewith. In addition, the opposing longitudinal edge portions may be angled inwardly to define a pair of adjacent inwardly extending tabs.