Connector arrangements for shielded electrical cables
Various high speed shielded cables are used in combination with a connector assembly. The connector assembly includes a plurality of electrical terminations in electrical contact with the conductor sets of the cable at a first end of the cable, the electrical terminations configured to make electrical contact with corresponding mating electrical terminations of a mating connector and at least one housing configured to retain the plurality of electrical terminations in a planar, spaced apart configuration.
1. A shielded electrical cable, comprising:
a plurality of differential pairs extending along a length of the cable and being arranged generally in a plane along a width of the cable, each differential pair including two jointly insulated conductors and being substantially surrounded by a shield;
first and second non-conductive polymeric layers disposed on opposite sides of the cable, the first and second layers including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second layers in combination substantially surround the plurality of differential pairs, and the pinched portions of the first and second layers in combination form pinched portions of the cable on each side of the plurality of differential pairs; and
an adhesive layer bonding the first non-conductive polymeric layer to the second non-conductive polymeric layer in the pinched portions of the cable;
wherein:
the first and second non-conductive polymeric layers are spaced apart within 0.05 mm of each other in each pinched portion along the length of the cable;
a maximum separation between the cover portions of the first and second non-conductive polymeric layers is D;
a minimum separation between the pinched portions of the first and second non-conductive polymeric layers is d 1 , d 1 /D being less than 0.25;
a minimum separation between the cover portions of the first and second non-conductive polymeric layers in a region between the conductors of each differential pair is d 2 , d 2 /D being greater than 0.33.
2. A shielded electrical ribbon cable, comprising:
a plurality of differential pairs extending lengthwise along the cable and being arranged generally in a plane along a width of the cable, each differential pair including two jointly insulated conductors and being substantially surrounded by a shield, the plurality of differential pairs including a first differential pair adjacent a second differential pair; and
a first and second non-conductive polymeric layers disposed on opposite sides of the cable, the first and second layers including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second layers in combination substantially surround the plurality of differential pairs, and the pinched portions of the first and second layers in combination form pinched portions of the cable on each side of the plurality of differential pairs;
wherein, when the cable is laid flat, a first insulated conductor of the first differential pair is nearest the second differential pair, and a second insulated conductor of the second differential pair is nearest the first differential pair, and the first and second insulated conductors have a center-to-center spacing S; and
wherein the first insulated conductor has an outer dimension D 1 and the second insulated conductor has an outer dimension D 2 ; and
wherein S/Dmin is in a range from 1.7 to 2, where Dmin is the lesser of D 1 and D 2 .