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An electrical interconnection system with high speed, high density electrical connectors. The connectors incorporate electrically lossy material, selectively positioned to reduce crosstalk without undesirably attenuating signals. The lossy material may be molded through ground conductors that separa

An electrical interconnection system with high speed, high density electrical connectors. The connectors incorporate electrically lossy material, selectively positioned to reduce crosstalk without undesirably attenuating signals. The lossy material may be molded through ground conductors that separate adjacent differential pairs within columns of conductive elements in the connector. However, regions of lossy material may be set back from the edges of the ground conductors to avoid undesired attenuation of signals. Also, the lossy material may be positioned in multiple regions along the length of signal conductors. The regions may be separated by holes, notches, gaps or other openings in the lossy material, which can be simply formed as part of a molding operation.

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What is claimed is: 1. An electrical connector comprising: a) a plurality of signal conductors, the plurality of signal conductors being disposed in an array; and b) a housing comprising: i) at least one insulative member disposed to hold the plurality of signal conductors in the array; and ii) at

What is claimed is: 1. An electrical connector comprising: a) a plurality of signal conductors, the plurality of signal conductors being disposed in an array; and b) a housing comprising: i) at least one insulative member disposed to hold the plurality of signal conductors in the array; and ii) at least one lossy member disposed along a length of a signal conductor to provide a plurality of lossy regions between the signal conductor and an adjacent signal conductor with at least one insulative region between adjacent lossy regions, wherein the at least one lossy member is electrically isolated from the signal conductor by the insulative member. 2. The electrical connector of claim 1, wherein the lossy regions and the at least one insulative region are adapted and arranged to reduce crosstalk between the signal conductor and the adjacent signal conductor with limited loss of signals carried by the signal conductor and adjacent signal conductor. 3. The electrical connector of claim 1, wherein the at least one insulative member comprises molded plastic and the at least one lossy member comprises molded plastic having conductive fillers. 4. The electrical connector of claim 1, wherein the at least one insulative member comprises molded plastic and the at least one lossy member comprises a plating on a surface of molded plastic that has lossy characteristics over a frequency range of 1 GHz to 12 GHz. 5. The electrical connector of claim 1, wherein the plurality of signal conductors are adapted and arranged to form a plurality of differential pairs and the plurality of lossy regions are disposed between adjacent signal conductors that form members of separate differential signal pairs. 6. The electrical connector of claim 1, wherein: the plurality of signal conductors are arranged in a column; the at least one lossy member comprises a parallel region parallel to the column and a plurality of perpendicular regions, extending from the parallel region; and the at least one insulative region comprises at least one opening in the parallel region between adjacent perpendicular regions. 7. The electrical connector of claim 6, wherein: the plurality of signal conductors in the column comprises a plurality of differential pairs, each pair having a first and a second signal conductor; each of the plurality of perpendicular regions is disposed between an adjacent differential pair; and the at least one opening in the parallel region comprises at least one opening positioned between the first and second signal conductors of a pair. 8. The electrical connector of claim 7, wherein the at least one insulative region further comprises at least one opening in the perpendicular regions. 9. The electrical connector of claim 8, wherein: the at least one opening in the parallel region comprises an opening in the parallel region between each adjacent perpendicular region; and the at least one opening in the perpendicular regions comprises an opening in each of the perpendicular regions, each opening in the perpendicular region in communication with an opening of the at least one opening in the parallel region, whereby each of the plurality of lossy regions comprises a U-shaped segment comprising a portion of the parallel region and a portion of the perpendicular regions and the plurality of lossy regions are separated by the openings in the perpendicular regions and the parallel regions. 10. The electrical connector of claim 1, wherein: the plurality of signal conductors is arranged in a column; the at least one lossy member comprises a parallel region parallel to the column and a plurality of perpendicular regions, extending from the parallel region; and the at least one insulative region comprises at least one opening in at least one region of the plurality of perpendicular regions. 11. The electrical connector of claim 1, wherein: the plurality of signal conductors are disposed in a column comprising a plurality of differential pairs; the at least one lossy member forms a plurality of channels having a bottom defined by a parallel region and sides defined by adjacent perpendicular regions extending from the parallel region, each of the channels receiving a differential pair; and each of the plurality of lossy regions comprises a portion of at least one of the plurality of channels separated by openings in the perpendicular regions. 12. The electrical connector of claim 1, wherein the at least one insulative region comprises air and/or a portion of the at least one insulative member. 13. The electrical connector of claim 1, wherein each of the at least one lossy members has a surface resistivity between 1 Ω/square and 100 Ω/square. 14. The electrical connector of claim 1, wherein each of the at least one lossy members has a surface resistivity between 1 sieman/meter and 30,000 siemans/meter. 15. The electrical connector of claim 1, wherein each of the at least one lossy members has a binder encapsulating conductive filler material. 16. An electrical connector comprising: a) a plurality of signal conductors, the plurality of signal conductors being disposed in an array; and b) a housing comprising: i) at least one insulative member disposed to hold the plurality of signal conductors in the array; and ii) at least one lossy member disposed along a length of a signal conductor to provide a plurality of lossy regions between the signal conductor and an adjacent signal conductor with at least one insulative region between adjacent lossy regions, wherein: each signal conductor comprises a mating contact portion, a contact tail and an intermediate portion electrically coupling the mating contact portion to the contact tail, and the intermediate portion of each signal conductor is embedded in the at least one insulative member; the plurality of signal conductors are arranged in a plurality of columns, the plurality of signal conductors in each of the plurality of columns comprising a plurality of differential pairs; the at least one lossy member comprises a plurality of parallel regions and a plurality of perpendicular regions, each of the plurality of parallel regions being disposed parallel to a column of the plurality of columns and each of the plurality of perpendicular regions extending from a parallel region; the at least one insulative region comprises at least one opening in each of the plurality of parallel regions between adjacent perpendicular regions; the at least one lossy member comprises a lossy member adjacent each of the plurality of columns, each lossy member forming a plurality of channels having a bottom defined by the parallel region adjacent the column and sides defined by adjacent perpendicular regions, each of the channels receiving a differential pair and each of the plurality of lossy regions comprises a portion of at least one of the plurality of channels separated by the openings in the lossy member; each of the plurality of perpendicular regions being disposed between an adjacent differential pair within a column of the plurality of columns; and the lossy regions and the insulative regions are adapted and arranged to reduce crosstalk between adjacent pairs of signal conductors with limited loss to signals carried by the pairs of the adjacent pairs of signal conductors. 17. The electrical connector of claim 16, further comprising a plurality of ground conductors, each of the ground conductors electrically connected to a perpendicular region of the plurality of perpendicular regions. 18. The electrical connector of claim 16, wherein each of the differential pairs in a column has a different length and the lossy regions are sized and arranged to provide a higher loss per unit length to shorter differential pairs than to longer differential pairs. 19. An electrical connector comprising: a) a plurality of signal conductors, the plurality of signal conductors being disposed in an array having at least one column; b) a plurality of ground conductors, each of the ground conductors: being disposed in a column of the at least one column; has a width extending in the direction of the column; being disposed adjacent at least one signal conductor of the plurality of signal conductors in the column; and having at least one edge facing an edge of the at least one adjacent signal conductor; and c) a housing comprising a plurality of electrically lossy regions, each lossy region disposed adjacent to and extending perpendicularly relative to a respective ground conductors of the plurality of ground conductors; wherein each perpendicularly extending lossy region of the plurality of lossy regions has a width less than the width of the respective ground conductor of the plurality of ground conductors such that the perpendicularly extending lossy region has a setback from the edge of the ground conductor in a direction away from the signal conductor adjacent the ground conductor. 20. The electrical connector of claim 19, further comprising at least one insulative portion, the insulative portion having a plurality of insulative regions; and wherein for each ground conductor, an insulative region of the plurality of insulative regions is positioned between an adjacent signal conductor and a perpendicularly extending lossy region and the insulative region is positioned in the setback. 21. The electrical connector of claim 20, wherein the insulative portion comprises molded plastic and is adapted and arranged to hold the plurality of signal conductors in an array. 22. The electrical connector of claim 20, wherein the insulative portion comprises a region of air. 23. An electrical connector comprising: a) a plurality of signal conductors, the plurality of signal conductors being disposed in an array having at least one column; b) a housing comprising a plurality of lossy regions, each lossy region adjacent at least one of the plurality of signal conductors; and c) a plurality of ground conductors, each of the ground conductors having an opening therethrough, and each of the ground conductors being disposed in a column of the at least one column, and each of the ground conductors being in electrical connection with a lossy region of the plurality of lossy regions; wherein a portion of the lossy region in electrical connection with each ground conductor is disposed through the opening in the ground conductor. 24. The electrical connector of claim 23, wherein i) each of the ground conductors is disposed adjacent a signal conductor in the column; ii) each of the ground conductors has an edge facing the adjacent signal conductor, iii) the lossy region in electrical connection with the ground conductor is disposed with a setback from the edge. 25. The electrical connector of claim 23, wherein: i) the electrical connector comprises a plurality of subassemblies, each subassembly having a first side and a second side, and the subassemblies being aligned side-by-side; ii) the at least one column comprises a plurality of columns, each column being positioned in a separate one of the plurality of subassemblies; and iii) in each subassembly a lossy region is exposed in a first side and at least one of the portions of the lossy region is electrically coupled to the second side. 26. The electrical connector of claim 25, wherein in each subassembly, at least one of the portions is exposed in the second side. 27. The electrical connector of claim 26, wherein the plurality of subassemblies are positioned to electrically couple the lossy regions of the plurality of subassemblies together, the coupling being formed by lossy regions exposed in the first sides of subassemblies of the plurality of subassemblies coupled to lossy regions exposed in the second sides of subassemblies of the plurality of subassemblies. 28. The electrical connector of claim 25, wherein in each subassembly a conductor exposed in the second side is electrically connected to at least one of the portions. 29. An electrical connector comprising: a) a plurality of signal conductors, the plurality of signal conductors being disposed in an array having a plurality of columns; b) a plurality of ground conductors, each of the ground conductors being disposed in a column of the plurality of columns; and c) a housing comprising a plurality of lossy regions, each lossy region comprising a binder with conductive fillers; wherein each of the lossy regions is positioned between two adjacent columns: i) in regions between two adjacent signal conductors, each of the two adjacent signal conductors being in a different one of the two adjacent columns; and ii) between two adjacent ground conductors, each of the two adjacent ground conductors being in a different one of the two adjacent columns. 30. The electrical connector of claim 29, wherein: i) the plurality of signal conductors comprises a plurality of differential pairs with the ground conductors of the plurality of ground conductors disposed between adjacent differential pairs; and ii) lossy regions are disposed between two adjacent differential pairs, each adjacent differential pair being in a different one of the two adjacent columns. 31. The electrical connector of claim 29, wherein each lossy region is electrically connected to at least one of the two adjacent ground conductors. 32. The electrical connector of claim 29, wherein the housing comprises a plurality of subassemblies, each subassembly having an insulative portion holding a column of signal conductors.