US Patent 10177483 Electrical connector assembly with impedance control at mating interface

An electrical connector assembly includes a module stack, a front housing, and a spring member. The module stack includes multiple contact modules disposed side by side. The module stack includes multiple signal contacts that project beyond a front side thereof. The front housing is mechanically coupled to the module stack at the front side and surrounds the signal contacts. The front housing defines cavities that receive mating contacts of a mating connector to engage the signal contacts. The front housing is movable relative to the module stack along a longitudinal axis of the electrical connector assembly between a retracted position and an extended position. The spring member is held between the module stack and the front housing. The spring member engages the module stack and the front housing to bias the front housing towards the extended position.