Differential signal transmission cable

A differential signal transmission cable comprising:

• an insulation layer extending in a longitudinal direction of the differential signal transmission cable;
• a pair of signal lines extending in the longitudinal direction and buried inside the insulation layer;
• an intermediate layer covering an outer circumferential surface of the insulation layer;
• and
• a shield covering an outer circumferential surface of the intermediate layer, wherein
• the shield includes an electroless plating layer covering the outer circumferential surface of the intermediate layer,
• the insulation layer includes polypropylene grains,
• the polypropylene grains have a crystal structure of monoclinic crystal, a crystal structure of hexagonal crystal, or a coexisting state of at least one of these crystal structuresi, and the polypropylene grains are oriented along two or less specific crystallographic axes, and
• in the insulation layer, a degree of crystalline orientation O110 calculated by an equation (2) is not greater than 0.65,
• O
• 110
• =
• I
• 110
• I
• 110
• +
• I
• 040
• (
• 2
• )
• where I110 denotes an integrated intensity of X-ray diffraction with an index 110, and I040 denotes an integrated intensity of X-ray diffraction with an index 040.

A differential signal transmission cable comprising:

• an insulation layer extending in a longitudinal direction of the differential signal transmission cable;
• a pair of signal lines extending in the longitudinal direction and buried inside the insulation layer;
• an intermediate layer covering an outer circumferential surface of the insulation layer;
• and
• a shield covering an outer circumferential surface of the intermediate layer, wherein
• the shield includes an electroless plating layer covering the outer circumferential surface of the intermediate layer,
• the insulation layer includes polypropylene grains, and
• the polypropylene grains have a crystallinity Xc of not less than 0.3, the crystallinity Xc being calculated by an equation (1),
• X
• c
• =
• I
• c
• I
• c
• +
• I
• a
• (
• 1
• )
• where Ic denotes an X-ray diffraction intensity of a crystal component, and Ia denotes an X-ray diffraction intensity of a non-crystal component.