Ground structure for a cable card assembly of an electrical connector

An electrical connector comprising:

• a housing having walls forming a cavity, the housing having a mating end at a front of the housing configured to be mated with a mating electrical connector;
• and
• a cable card assembly received in the cavity of the housing, the cable card assembly including a circuit card, cables terminated to the circuit card, and a ground bus coupled to the circuit card, the circuit card having an upper surface and a lower surface, the circuit card having a cable end and a mating end opposite the cable end, the circuit card having cable conductors at the cable end, the circuit card having mating conductors at the mating end, the mating end of the circuit card configured to be plugged into a card slot of the mating electrical connector, the cables including signal conductors and ground shields surrounding the corresponding signal conductors to provide electrical shielding for the signal conductors, the signal conductors having exposed portions extending forward of the cable shields, the exposed portions being terminated to corresponding cable conductors, the ground bus being electrically connected to the ground shields to electrically connect the ground shields of the cables, the ground bus including a molded body including tunnels receiving the exposed portions of corresponding signal conductors, the molded body being contoured to control impedance along the exposed portions of the signal conductors, wherein the ground bus includes cable pockets at a rear of the ground bus shaped to follow contours of the ground shield to interface with an outer end and both sides of the ground shield.