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An improved broadside coupled, open pin field connector. The connector incorporates lossy material to selectively dampen resonance within pairs of conductive members connected to ground when the connector is mounted to a printed circuit board. The material may also decrease crosstalk and mode conver

An improved broadside coupled, open pin field connector. The connector incorporates lossy material to selectively dampen resonance within pairs of conductive members connected to ground when the connector is mounted to a printed circuit board. The material may also decrease crosstalk and mode conversion. The lossy material is selectively positioned to substantially dampen resonances along pairs that may be connected to ground without unacceptably attenuating signals carried by other pairs. The lossy material may be selectively positioned near mating contact portions of the conductive members. Multiple techniques are described for selectively positioning the lossy material, including molding, inserting lossy members into a housing or coating surfaces of the connector housing. The lossy material alternatively may be positioned between broad sides of conductive members of a pair.

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1. An electrical connector, comprising: a plurality of conductive members disposed in a plurality of parallel columns of conductive members, each of the plurality of conductive members comprising a mating interface portion, a contact tail, and an intermediate portion electrically coupling the contac

1. An electrical connector, comprising: a plurality of conductive members disposed in a plurality of parallel columns of conductive members, each of the plurality of conductive members comprising a mating interface portion, a contact tail, and an intermediate portion electrically coupling the contact tail and the mating interface portion, wherein the plurality of conductive members are arranged in pairs; anda plurality of lossy members, each lossy member being elongated in at least one direction that is parallel to a respective column of the plurality of parallel columns of conductive members and being positioned adjacent the mating interface portions of conductive members in the respective column of the plurality of parallel columns such that the electrical connector is substantially free of the plurality of lossy members between intermediate portions of conductive members of adjacent pairs of the plurality of conductive members, wherein at least one lossy member of the plurality of lossy members comprises a material having a conductivity between 1 siemens/meter and 1×107 siemens/meter. 2. The electrical connector of claim 1, further comprising an insulative housing, wherein the plurality of conductive members are affixed to the insulative housing, and wherein the insulative housing comprises a plurality of slots and each of the plurality of lossy members is disposed within a slot of the plurality of slots. 3. The electrical connector of claim 2, wherein: each of the plurality of lossy members comprises a planar portion and a cap portion; andthe planar portion of each of the plurality of lossy members is disposed within a slot of the plurality of slots and the cap portion extends above the slot. 4. The electrical connector of claim 1, wherein each column of conductive members has an elongated lossy member positioned adjacent mating interface portions of conductive members in the column of conductive members. 5. The electrical connector of claim 1, wherein: the plurality of conductive members form differential pairs of signal conductors in which, for each pair, the signal conductors have wider spaced and more closely spaced portions, with a transition region between the more closely spaced and wider spaced portions; andthe lossy members are preferentially positioned adjacent the transition regions of the pairs of signal conductors. 6. The electrical connector of claim 1, wherein the lossy members are electrically lossy. 7. The electrical connector of claim 6, wherein the electrical connector is a daughter card connector. 8. The electrical connector of claim 1, wherein: each of the plurality of conductive members comprises edges and broad sides, and the conductive members in each of the plurality of columns are positioned edge to edge. 9. The electrical connector of claim 8, wherein: each of the plurality of lossy members is adjacent a respective column of conductive members, and the lossy member comprises at least first and second portions, the first portion extending from the second portion towards the respective column. 10. An electrical connector, comprising: a plurality of conductive members disposed in a plurality of parallel columns of conductive members, each of the plurality of conductive members comprising a mating interface portion; anda plurality of lossy members, each lossy member being elongated in at least one direction that is parallel to a respective column of the plurality of parallel columns of conductive members and being positioned adjacent the mating interface portions of conductive members in the respective column of the plurality of parallel columns, wherein:the plurality of parallel columns are disposed in pairs; anda lossy member of the plurality of lossy members is positioned between adjacent pairs of columns and the space between the parallel columns of each pair is substantially free of the lossy members. 11. The electrical connector of claim 10, wherein each of the plurality of parallel columns of conductive members comprises a plurality of conductive members of the same width. 12. The electrical connector of claim 11, wherein each of the plurality of conductive members within a first column of each pair is broadside coupled to a conductive member of a second column of said pair. 13. The electrical connector of claim 12, wherein the connector comprises an open pin field connector. 14. The electrical connector of claim 13, wherein the connector comprises a backplane connector having an insulative shroud. 15. An electrical connector, comprising: a plurality of conductive members disposed in a plurality of parallel columns of conductive members, each of the plurality of conductive members comprising a mating interface portion; anda plurality of lossy members, each lossy member being elongated in at least one direction that is parallel to a respective column of the plurality of parallel columns of conductive members and being positioned adjacent the mating interface portions of conductive members in the respective column of the plurality of parallel columns; andan insulative housing comprising: a plurality of insulative members, each insulative member having a column of conductive members affixed thereto; anda front housing portion, the front housing portion comprising a plurality of openings and a plurality of slots, wherein the mating interface portion of each conductive member of the plurality of conductive members is at least partially disposed within an opening and each lossy member of the plurality of lossy members is at least partially disposed within a respective slot of the plurality of slots. 16. An electrical connector comprising: a plurality of subassemblies, each of the plurality of subassemblies comprising a plurality of conductive members, each of the plurality of conductive members adapted at least to be a signal conductor and comprising a mating contact portion, a contact tail, and an intermediate portion electrically coupling the contact tail and the mating contact portion, the mating contact portions of the plurality of subassemblies being arranged in parallel columns; anda housing portion comprising a plurality of openings disposed in parallel columns, with the columns of mating contact portions of the plurality of subassemblies being positioned in the plurality of openings, the housing portion comprising insulative regions and lossy regions, the lossy regions being positioned to separate pairs of adjacent columns of mating contact portions of conductive members adapted at least to be signal conductors, wherein at least one of the lossy regions comprises a material having a surface resistivity between 1 Ω/square and 106 Ω/square, and wherein the conductive members are arranged in pairs and the electrical connector is substantially free of the lossy regions between intermediate portions of conductive members of adjacent pairs of the conductive members. 17. The electrical connector of claim 16, wherein the insulative regions of the housing portion comprise regions of at least one unitary insulative member comprising openings for at least six columns of openings, the insulative member comprising a plurality of slots and the lossy regions comprising a plurality of lossy members, each lossy member disposed in a respective slot of the plurality of slots. 18. An electrical connector comprising: a plurality of subassemblies, each of the plurality of subassemblies comprising a plurality of conductive members, each of the plurality of conductive members adapted at least to be a signal conductor and comprising a mating contact portion, a contact tail, and an intermediate portion electrically coupling the contact tail and the mating contact portion, the mating contact portions of the plurality of subassemblies being arranged in parallel columns; anda housing portion comprising a plurality of openings disposed in parallel columns, with the columns of mating contact portions of the plurality of subassemblies being positioned in the plurality of openings, the housing portion comprising insulative regions and lossy regions, the lossy regions being positioned to separate pairs of adjacent columns of mating contact portions of conductive members adapted at least to be signal conductors, wherein the conductive members are arranged in pairs and the electrical connector is substantially free of the lossy regions between intermediate portions of conductive members of adjacent pairs of the conductive members, and wherein the insulative regions of the housing portion comprise regions of a plurality of insulative members, each of the plurality of insulative members having two columns of openings. 19. The electrical connector of claim 18, wherein: each of the plurality of insulative members comprises a side surface; andeach of the lossy regions comprises a partially conductive coating on a side surface of an insulative member of the plurality of insulative members. 20. An electrical connector comprising: a plurality of subassemblies, each of the plurality of subassemblies comprising a plurality of conductive members, each of the plurality of conductive members adapted at least to be a signal conductor and comprising a mating contact portion, the mating contact portions of the plurality of subassemblies being arranged in parallel columns; anda housing portion comprising a plurality of openings disposed in parallel columns, with the columns of mating contact portions of the plurality of subassemblies being positioned in the plurality of openings, the housing portion comprising insulative regions and lossy regions, the lossy regions being positioned to separate pairs of adjacent columns of mating contact portions of conductive members adapted at least to be signal conductors, wherein, for each of the plurality of subassemblies: the subassembly further comprises an insulative portion having a first face and a second face;the mating contact portions of the plurality of conductive members extend through the first face;each of the plurality of conductive members further comprises a contact tail, the contact tails extending through the second face; andeach of the plurality of conductive members further comprises an intermediate portion electrically coupling the contact tail and the mating contact portion. 21. The electrical connector of claim 20, wherein the subassemblies are adapted and configured to position the plurality of conductive members in pairs, with conductive members of each pair being positioned in respective ones of two adjacent parallel columns, the mating contact portions of the conductive members of each pair being separated by a first distance and the intermediate portions of the conductive members of each pair being separated by a second distance, the second distance being less than the first distance. 22. The electrical connector of claim 21, wherein the lossy regions have a first width in a direction perpendicular to the parallel columns adjacent mating contact portions of the conductive members and a second width in the direction perpendicular to the parallel columns adjacent intermediate portions of the conductive members. 23. The electrical connector of claim 22, wherein the electrical connector is substantially free of lossy material between intermediate portions of conductive members of adjacent pairs of the plurality of conductive members. 24. An electrical connector comprising: a plurality of broadside coupled pairs of conductive elements, each of the conductive elements comprising a mating contact portion, a contact tail and an intermediate portion therebetween, the mating contact portions of the conductive elements of each pair being separated by a first distance and the intermediate portions of the conductive elements of each pair being separated by a second distance, the second distance being less than the first distance, the pairs being positioned in a plurality of parallel rows; andlossy material selectively positioned adjacent the mating contact portions between adjacent rows of the plurality of parallel rows, wherein the electrical connector is substantially free of the lossy material between intermediate portions of conductive elements of adjacent pairs of conductive elements. 25. The electrical connector of claim 24, wherein the electrical connector comprises an open pin field connector. 26. The electrical connector of claim 25 in combination with a printed circuit board, the printed circuit board comprising a plurality of signal traces and at least one ground plane, wherein the conductive elements of a first portion of the plurality of pairs are connected to the at least one ground plane and the conductive elements of a second portion of the plurality of pairs are each connected to a signal trace of the plurality of signal traces. 27. An electrical connector comprising: a plurality of subassemblies, each subassembly comprising: a first wafer, the first wafer comprising: a first plurality of conductive elements, each of the first plurality of conductive elements having a broad side, a mating contact portion and a contact tail; anda first plurality of insulative members, each insulative member of the first plurality of insulative members being positioned between adjacent conductive elements of the first plurality of conductive elements;a second wafer, the second wafer comprising: a second plurality of conductive elements, each of the second plurality of conductive elements comprising a broad side, a mating contact portion and a contact tail, the first wafer being attached to the second wafer with the broad sides of the first plurality of conductive elements and the broad sides of the second plurality of conductive elements aligned to form pairs, each pair comprising a conductive element of the first plurality of conductive elements and a conductive element of the second plurality of conductive elements, the first and second pluralities of conductive elements being configured such that, within each pair the broad sides of the conductive elements of the pair are separated by a distance smaller than a distance separating mating contact portions; andan insert that is separately manufactured and assembled with the first wafer, the insert comprising a planar portion and being separated from the first plurality of conductive members by the first plurality of insulative members, the insert comprising a material that attenuates electromagnetic radiation. 28. The electrical connector of claim 27, wherein the material that attenuates electromagnetic radiation comprises a ferrite. 29. The electrical connector of claim 27, wherein the material that attenuates electromagnetic radiation comprises carbon particulate. 30. The electrical connector of claim 27, wherein the first wafer comprises a surface having a recessed region and the insert is mounted within the recessed region. 31. The electrical connector of claim 30, wherein the insert is a first insert, and wherein: the second wafer comprises a second plurality of insulative members, each insulative member of the second plurality of insulative members being positioned between adjacent conductive elements of the second plurality of conductive elements; andthe subassembly comprises a second insert coupled to the second wafer, the second insert comprising a planar portion and being separated from the second plurality of conductive members by the second plurality of insulative members, the second insert comprising a material that attenuates electromagnetic radiation. 32. The electrical connector of claim 31, wherein the first insert comprises a plurality of ridges extending from the planar portion, the ridges comprising lossy material, and the ridges being disposed between adjacent conductive elements of the first plurality of conductive elements. 33. An electrical connector comprising: a plurality of subassemblies disposed in parallel, each subassembly comprising: a plurality of conductive elements arranged in a column; andan insulative member holding the plurality of conductive elements;a plurality of inserts that are separately manufactured and assembled with the plurality of subassemblies, each insert comprising a material that attenuates electromagnetic radiation, each insert positioned between adjacent subassemblies of the plurality of subassemblies, at least a portion of the each insert being adjacent a respective column of conductive elements in an adjacent subassembly. 34. The electrical connector of claim 33, wherein each of the plurality of inserts comprises a plurality of portions projecting toward the plurality of conductive elements in an adjacent subassembly. 35. The electrical connector of claim 33, wherein the material that attenuates electromagnetic radiation has a conductivity between 1 siemens/meter and 30,000 siemens/meter. 36. The electrical connector of claim 33, wherein the material that attenuates electromagnetic radiation has a surface resistivity between 20 Ω/square and 40 Ω/square. 37. The electrical connector of claim 33, wherein the material that attenuates electromagnetic radiation comprises a ferrite. 38. The electrical connector of claim 33, wherein the material that attenuates electromagnetic radiation comprises carbon particulate. 39. The electrical connector of claim 33, wherein the material that attenuates electromagnetic radiation comprises an insulative binder material holding conductive filler material. 40. The electrical connector of claim 33, wherein: the conductive elements in the plurality of subassemblies form differential pairs of signal conductors in which, for each pair, the signal conductors have wider spaced and more closely spaced portions, with a transition region between the more closely spaced and wider spaced portions; andthe lossy inserts are preferentially positioned adjacent the transition regions of the pairs of signal conductors. 41. The electrical connector of claim 33, wherein the insulative members of the plurality of subassemblies are configured to provide a plurality of cavities between adjacent ones of the plurality of subassemblies and each of the plurality of inserts is disposed in a cavity of the plurality of cavities. 42. The electrical connector of claim 41, wherein each of the plurality of cavities and each of the plurality of inserts is sized such that each cavity receives an insert without changing the spacing between adjacent subassemblies. 43. The electrical connector of claim 33, wherein each of the plurality of inserts comprises a plurality of ribs. 44. The electrical connector of claim 43, wherein each of the plurality of inserts does not contact the plurality of conductive elements in an adjacent subassembly. 45. The electrical connector of claim 43 wherein each insert is coupled to a first portion of the plurality of conductive elements in an adjacent subassembly and is not coupled to a second portion of the plurality of conductive elements in the adjacent subassembly. 46. The electrical connector of claim 33, wherein the material that attenuates electromagnetic radiation is an electrically lossy material. 47. The electrical connector of claim 46, wherein the electrical connector is a daughter card connector. 48. The electrical connector of claim 33, wherein: the plurality of conductive elements in each of the plurality of subassemblies comprise edges and broad sides, and the conductive elements are positioned edge to edge. 49. The electrical connector of claim 48, wherein: each of the plurality of inserts is adjacent a respective column of conductive elements, and the insert comprises at least first and second portions, the first portion extending from the second portion towards the respective column. 50. The electrical connector of claim 49, wherein: the inserts are electrically lossy and have a conductivity between 1 Siemens/meter and 1×107 Siemens/meter.