Electrical Connector System

A header module for an electrical connector system that is adapted to mate with a wafer housing and a plurality of wafer assemblies, the header module comprising:

• a plurality of C-shaped ground shields positioned on a mating face of the header module;
• a plurality of ground tabs positioned on the mating face of the header module;
• and
• a plurality of signal pin pairs positioned on the mating face of the header module;
• wherein each C-shaped ground shield of the plurality of C-shaped ground shields is positioned to substantially surround three sides of a signal pin pair of the plurality of signal pin pairs;
• and
• wherein at least one signal pin pair of the plurality of signal pin pairs is substantially surrounded by a C-shaped ground shield of the plurality of C-shaped ground shields and a ground tab of the plurality of ground tabs.

A header module for an electrical connector system that is adapted to mate with a wafer housing and a plurality of wafer assemblies, the header module comprising:

• a plurality of C-shaped ground shields positioned on a mating face of the header module, each C-shaped ground shield defining at least one ground substrate engagement element at a mounting face of the header module;
• a plurality of ground tabs positioned on the mating face of the header module, each ground tab defining at least one ground substrate engagement element at the mounting face of the header module;
• and
• a plurality of signal pin pairs positioned on the mating face of the header module, each signal pin of the signal pin pairs defining a signal substrate engagement element at the mounting face of the header module;
• wherein the ground substrate engagement elements and the signal substrate engagement elements are positioned on the mounting face of the header module such that there is at least one ground substrate engagement element positioned directly between each signal substrate engagement element and any of the closest non-paired signal substrate engagement element neighbors.