Coaxial cables are constructed by a central core of conducting material foamed with a layer of insulating material, surrounded by a further layer of external conducting material, covered with an outer sheath.
To cope with the demands of high-frequency signal transmission and to suppress signal waveform rounding, the size of the core conductor must be increased and the external dimensions of the surrounding insulation must also increase in turn.
As a result, the overall cable becomes thicker and is unable to address the need for greater compactness and high-density installation.
At Sumitomo Electric, we have solved this problem by developing insulating materials that are formed with large numbers of minute air bubbles in the material, so that the material has a smaller dielectric constant and the external diameter of the insulating layer can be made as small as possible.
This is referred as insulation foaming technology. To achieve a level of foaming that is close to the ideal of a barrier consisting solely of air, very high levels of expertise are required in production and installation technology and in the formulation of materials.
By combining excellent insulation properties with a minimized external diameter, and by using insulation materials formulation techniques, we have achieved high levels of strength performance.
