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A mezzanine connector assembly includes a mezzanine receptacle connector having a plurality of receptacle contacts arranged in pairs for carrying differential pair signals and each having a mating interface. The mezzanine receptacle connector has a plurality of receptacle ground shields surrounding

A mezzanine connector assembly includes a mezzanine receptacle connector having a plurality of receptacle contacts arranged in pairs for carrying differential pair signals and each having a mating interface. The mezzanine receptacle connector has a plurality of receptacle ground shields surrounding each pair of receptacle contacts and providing electrical shielding from each other pair. The mezzanine connector assembly includes a mezzanine header connector having a plurality of header contacts arranged in pairs. Each header contact has a mating segment mated to the mating interface of the corresponding receptacle contact. The mezzanine header connector has a plurality of header ground shields surrounding each pair of header contacts and providing electrical shielding from each other pair of header contacts. The header ground shields are mechanically and electrically connected to associated receptacle ground shields to create shield boxes around the various mated pairs of header and receptacle contacts.

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1. A mezzanine connector assembly comprising: a mezzanine receptacle connector extending between a mating end and a mounting end opposite the mating end configured to be mounted to a first circuit board, the mezzanine receptacle connector comprising a plurality of receptacle contacts arranged in pai

1. A mezzanine connector assembly comprising: a mezzanine receptacle connector extending between a mating end and a mounting end opposite the mating end configured to be mounted to a first circuit board, the mezzanine receptacle connector comprising a plurality of receptacle contacts arranged in pairs for carrying differential pair signals, each receptacle contact having a mating interface, the mezzanine receptacle connector having a plurality of receptacle ground shields surrounding each pair of receptacle contacts and providing electrical shielding from each other pair of receptacle contacts; anda mezzanine header connector extending between a mating end mated to the mating end of the mezzanine receptacle connector and a mounting end opposite the mating end configured to be mounted to a second circuit board such that the first and second circuit boards are parallel and spaced apart with the mezzanine receptacle connector and the mezzanine header connector therebetween, the mezzanine header connector comprising a plurality of header contacts arranged in pairs for carrying differential pair signals, each header contact having a mating segment mated to the mating interface of the corresponding receptacle contact, the mezzanine header connector having a plurality of header ground shields surrounding each pair of header contacts and providing electrical shielding from each other pair of header contacts, the header ground shields being mechanically and electrically connected to associated receptacle ground shields to create shield boxes around the various mated pairs of header and receptacle contacts. 2. The mezzanine connector assembly of claim 1, wherein the receptacle ground shields are arranged in a receptacle ground lattice having longitudinal receptacle ground shield strips and lateral receptacle ground shield strips interconnected to form the receptacle ground lattice. 3. The mezzanine connector assembly of claim 1, wherein the header ground shields are arranged in a header ground lattice having longitudinal header ground shield strips and lateral header ground shield strips interconnected to form the header ground lattice. 4. The mezzanine connector assembly of claim 1, wherein the header ground shields include planar blades providing shielding along an entire length of the mating segments of the associated pair of header contacts, the receptacle ground shields including spring beams engaging corresponding blades of the header ground shields. 5. The mezzanine connector assembly of claim 1, wherein the shield boxes comprise a pair of opposed longitudinal header ground shields, a pair of opposed lateral header ground shields, a pair of opposed longitudinal receptacle ground shields, and a pair of opposed lateral receptacle ground shields. 6. The mezzanine connector assembly of claim 1, wherein the header ground shields include planar blades, the receptacle ground shields include planar bases, the mezzanine header connector being coupled to the mezzanine receptacle connector such that the planar blades are aligned coplanar with corresponding planar bases. 7. The mezzanine connector assembly of claim 6, wherein the mezzanine receptacle connector includes spring beams extending from corresponding bases, the spring beams mechanically and electrically connecting the receptacle ground shields to the corresponding header ground shields. 8. The mezzanine connector assembly of claim 7, wherein the spring beams are arranged in pairs, each pair of spring beams engaging respective opposite sides of a corresponding blade. 9. The mezzanine connector assembly of claim 1, wherein the receptacle ground shields include spring beams engaging corresponding header ground shields, the spring beams being configured to engage the header ground shields in a staged mating process where less than all of the spring beams initially engage the header ground shields and wherein further mating of the mezzanine header connector with the mezzanine receptacle connector allows all of the spring beams to engage the header ground shields. 10. A mezzanine connector assembly comprising: a mezzanine receptacle connector comprising a housing mounted to a first circuit board and elongated along a longitudinal axis, the mezzanine receptacle connector having receptacle contacts held by the housing and a receptacle ground lattice held by the housing, the receptacle ground lattice comprising longitudinal receptacle ground shields extending longitudinally within the housing generally parallel to the longitudinal axis, and the receptacle ground lattice comprising lateral receptacle ground shields extending laterally within the housing generally perpendicular to the longitudinal axis, the longitudinal receptacle ground shields being mechanically and electrically connected to the lateral receptacle ground shields to form the receptacle ground lattice; anda mezzanine header connector coupled to the mezzanine receptacle connector at a mating interface, the mezzanine header connector comprising at least one housing frame having a front at the mating interface and a rear mounted to a second circuit board and holding at least one contact assembly, each contact assembly comprising a plurality of header contacts having mating segments mated with corresponding receptacle contacts, the at least one housing frame being conductive and providing electrical shielding between the front and the rear for the header contacts, the mezzanine header connector comprising a header ground lattice provided at the front of the at least one housing frame, the header ground lattice being electrically connected to the at least one conductive housing frame to continue the electrical shielding at the mating interface of the mezzanine header connector, the header ground lattice comprising longitudinal header ground shields extending longitudinally within the at least one housing frame generally parallel to the longitudinal axis, and the header ground lattice comprising lateral header ground shields extending laterally within the at least one housing frame generally perpendicular to the longitudinal axis, the longitudinal header ground shields being mechanically and electrically connected to the lateral header ground shields to form the header ground lattice;wherein the longitudinal header ground shields are mechanically and electrically connected to corresponding longitudinal receptacle ground shields and the lateral header ground shields are mechanically and electrically connected to corresponding lateral receptacle ground shields to form shield boxes surrounding mating interfaces of corresponding receptacle and header contacts. 11. The mezzanine connector assembly of claim 10, wherein the longitudinal receptacle ground shields are arranged in longitudinal receptacle ground shield strips and the lateral receptacle ground shields are arranged in lateral receptacle ground shield strips, the longitudinal receptacle ground shield strips are interconnected with the lateral receptacle ground shield strips to form the receptacle ground lattice. 12. The mezzanine connector assembly of claim 10, wherein the longitudinal header ground shields are arranged in longitudinal header ground shield strips and the lateral header ground shields are arranged in lateral header ground shield strips, the longitudinal header ground shield strips are interconnected with the lateral header ground shield strips to form the header ground lattice. 13. The mezzanine connector assembly of claim 10, wherein the header ground shields include planar blades providing shielding along an entire length of the mating segments of the associated pair of header contacts, the receptacle ground shields include spring beams engaging corresponding blades of the header ground shields. 14. The mezzanine connector assembly of claim 10, wherein the shield boxes comprise a pair of opposed longitudinal header ground shields, a pair of opposed lateral header ground shields, a pair of opposed longitudinal receptacle ground shields, and a pair of opposed lateral receptacle ground shields. 15. The mezzanine connector assembly of claim 10, wherein the header ground shields include planar blades, the receptacle ground shields include planar bases, the mezzanine header connector being coupled to the mezzanine receptacle connector such that the planar blades are aligned coplanar with corresponding planar bases. 16. A mezzanine connector assembly comprising: a mezzanine receptacle connector comprising a housing mounted to a first circuit board and elongated along a longitudinal axis, the mezzanine receptacle connector having receptacle contacts held by the housing and a receptacle ground lattice held by the housing, the receptacle ground lattice comprising longitudinal receptacle ground shields extending longitudinally within the housing generally parallel to the longitudinal axis, and the receptacle ground lattice comprising lateral receptacle ground shields extending laterally within the housing generally perpendicular to the longitudinal axis, the longitudinal receptacle ground shields being mechanically and electrically connected to the lateral receptacle ground shields to form the receptacle ground lattice; anda mezzanine header connector coupled to the mezzanine receptacle connector, the mezzanine header connector comprising header modules stacked together and mounted to a second circuit board, the header modules each comprising a conductive housing frame holding at least one contact assembly, each contact assembly comprising a plurality of header contacts having mating segments mated with corresponding receptacle contacts, the conductive housing frame providing electrical shielding for the header contacts, the mezzanine header connector comprising a header ground lattice provided at a front of the header modules, the header ground lattice comprising longitudinal header ground shields extending longitudinally within the at least one housing frame generally parallel to the longitudinal axis, and the header ground lattice comprising lateral header ground shields extending laterally within the at least one housing frame generally perpendicular to the longitudinal axis, the longitudinal header ground shields being mechanically and electrically connected to the lateral header ground shields to form the header ground lattice;wherein the longitudinal header ground shields are mechanically and electrically connected to corresponding longitudinal receptacle ground shields and the lateral header ground shields are mechanically and electrically connected to corresponding lateral receptacle ground shields to form shield boxes surrounding mating interfaces of corresponding receptacle and header contacts; andwherein the longitudinal and lateral header ground shields are mechanically and electrically connected to the conductive housing frames to electrically common the header ground lattice and receptacle ground lattice with the housing frames to provide shielding along the header contacts from the mating interfaces with the receptacle contacts to the second circuit board. 17. The mezzanine connector assembly of claim 16, wherein the longitudinal receptacle ground shields are arranged in longitudinal receptacle ground shield strips and the lateral receptacle ground shields are arranged in lateral receptacle ground shield strips, the longitudinal receptacle ground shield strips are interconnected with the lateral receptacle ground shield strips to form the receptacle ground lattice. 18. The mezzanine connector assembly of claim 16, wherein the longitudinal header ground shields are arranged in longitudinal header ground shield strips and the lateral header ground shields are arranged in lateral header ground shield strips, the longitudinal header ground shield strips are interconnected with the lateral header ground shield strips to form the header ground lattice. 19. The mezzanine connector assembly of claim 16, wherein the header ground shields include planar blades providing shielding along an entire length of the mating segments of the associated pair of header contacts, the receptacle ground shields include spring beams engaging corresponding blades of the header ground shields. 20. The mezzanine connector assembly of claim 16, wherein the header ground shields include planar blades, the receptacle ground shields include planar bases, the mezzanine header connector being coupled to the mezzanine receptacle connector such that the planar blades are aligned coplanar with corresponding planar bases.