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An electrical connector includes a housing and plural contact modules stacked adjacent to each other and held by the housing. Each contact module includes a contact array, a dielectric holder, and lossy blocks. The contact array includes signal contacts and ground contacts arranged in alternating pa

An electrical connector includes a housing and plural contact modules stacked adjacent to each other and held by the housing. Each contact module includes a contact array, a dielectric holder, and lossy blocks. The contact array includes signal contacts and ground contacts arranged in alternating pairs along a length of a column. The dielectric holder surrounds and engages the signal and ground contacts along intermediate segments thereof to secure the signal and ground contacts in place. The lossy blocks are mounted to the intermediate segments of the ground contacts within the dielectric holder. Each lossy block is associated with a corresponding pair of ground contacts and engages at least one of the ground contacts in the pair. The lossy blocks are composed of a lossy material that has a greater loss tangent than a low loss material that forms the dielectric holder.

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1. An electrical connector comprising: a housing; andplural contact modules stacked adjacent to each other along a stack axis and held by the housing, each contact module comprising: a contact array including signal contacts and ground contacts arranged in a column, the signal contacts and the groun

1. An electrical connector comprising: a housing; andplural contact modules stacked adjacent to each other along a stack axis and held by the housing, each contact module comprising: a contact array including signal contacts and ground contacts arranged in a column, the signal contacts and the ground contacts arranged in alternating pairs along a length of the column such that a pair of ground contacts extends between two pairs of signal contacts, the signal and ground contacts extending between respective mating ends configured to engage a mating connector and terminating ends configured to engage a circuit board;a dielectric holder surrounding and engaging the signal and ground contacts along intermediate segments thereof between the mating and terminating ends to secure the signal and ground contacts in place relative to the dielectric holder, the dielectric holder composed of a low loss material; andlossy blocks mounted to the intermediate segments of the ground contacts within the dielectric holder, each lossy block associated with a corresponding pair of ground contacts and engaging at least one of the ground contacts in the corresponding pair, the lossy blocks composed of a lossy material that has a loss tangent greater than a lost tangent of the low loss material of the dielectric holder. 2. The electrical connector of claim 1, wherein the ground contacts in a corresponding pair each have a respective inner side and an outer side opposite to the inner side, the inner sides facing each other and defining an inner gap between the ground contacts, the lossy blocks extending into the inner gaps of corresponding pairs of ground contacts, the lossy blocks not extending laterally outward beyond the outer sides of the ground contacts. 3. The electrical connector of claim 1, wherein the signal and ground contacts in different contact modules align in multiple rows oriented perpendicular to the columns, the signal and ground contacts in adjacent contact modules being staggered such that a ground contact of one contact module aligns in a first row with a signal contact of an adjacent contact module, and a signal contact of the one contact module aligns in a different row with a ground contact of the adjacent contact module. 4. The electrical connector of claim 1, wherein two lossy blocks are associated with each corresponding pair of ground contacts, each lossy block engaging and at least partially surrounding one of the ground contacts in the corresponding pair of ground contacts, the two lossy blocks separated from each other by a gap. 5. The electrical connector of claim 1, wherein the lossy blocks are overmolded over the intermediate segments of the ground contacts. 6. The electrical connector of claim 1, wherein the dielectric holder is overmolded over the contact array and the lossy blocks. 7. The electrical connector of claim 1, wherein the ground contacts in a corresponding pair each have a respective inner side and an outer side opposite to the inner side, the inner sides facing each other and defining an inner gap between the ground contacts, the lossy blocks engage and extend along the inner sides of the ground contacts in an associated pair of ground contacts and do not engage the outer sides of the ground contacts. 8. The electrical connector of claim 1, wherein the ground contacts in a corresponding pair each have a respective inner side, an outer side opposite to the inner side, and a front side and a back side extending between the inner and outer sides, the inner sides facing each other and defining an inner gap between the ground contacts, the lossy blocks including a base and two arms extending from the base, the arms of each lossy block engaging the front side and the back side, respectively, of a corresponding ground contact, the base engaging the inner side of the corresponding ground contact between the two arms. 9. The electrical connector of claim 8, wherein the base comprises a majority of a size of the respective lossy block such that a majority of the lossy material of the lossy block is disposed within the inner gap between the ground contacts in the corresponding pair. 10. The electrical connector of claim 1, wherein the lossy blocks include a base and two arms extending from the base, the arms of each lossy block extending parallel to each other in a same direction and defining a groove therebetween, each lossy block receiving a corresponding ground contact within the groove to mount the lossy block to the ground contact via an interference fit. 11. An electrical connector comprising: a housing; andplural contact modules stacked adjacent to each other along a stack axis and held by the housing, each contact module comprising: a contact array including signal contacts and ground contacts arranged in a column, the signal contacts and the ground contacts arranged in alternating pairs along a length of the column such that a pair of ground contacts extends between two pairs of signal contacts, the signal and ground contacts extending between respective mating ends configured to engage a mating connector and terminating ends configured to engage a circuit board;a dielectric holder surrounding and engaging the signal and ground contacts along intermediate segments thereof between the mating and terminating ends to secure the signal and ground contacts in place relative to the dielectric holder, the dielectric holder composed of a low loss material; andlossy blocks overmolded over the intermediate segments of the ground contacts within the dielectric holder, each lossy block associated with a corresponding pair of ground contacts and overmolded over at least one of the ground contacts in the corresponding pair, the lossy blocks composed of a lossy material that has a loss tangent greater than a lost tangent of the low loss material of the dielectric holder. 12. The electrical connector of claim 11, wherein the ground contacts in a corresponding pair each have a respective inner side and an outer side opposite to the inner side, the inner sides facing each other and defining an inner gap between the ground contacts, the lossy blocks extending into the inner gaps of corresponding pairs of ground contacts, the lossy blocks not extending laterally outward beyond the outer sides of the ground contacts. 13. The electrical connector of claim 11, wherein the dielectric holder is overmolded over the contact array and the lossy blocks. 14. The electrical connector of claim 11, wherein two lossy blocks are associated with each corresponding pair of ground contacts, each lossy block engaging and at least partially surrounding one of the ground contacts in the corresponding pair of ground contacts, the two lossy blocks separated from each other by a gap. 15. The electrical connector of claim 11, wherein the ground contacts in a corresponding pair each have a respective inner side and an outer side opposite to the inner side, the inner sides facing each other and defining an inner gap between the ground contacts, the lossy blocks engage and extend along the inner sides of the ground contacts in an associated pair of ground contacts and do not engage the outer sides of the ground contacts. 16. The electrical connector of claim 11, wherein the signal and ground contacts in different contact modules align in multiple rows oriented perpendicular to the columns, the signal and ground contacts in adjacent contact modules being staggered such that a ground contact of one contact module aligns in a first row with a signal contact of an adjacent contact module, and a signal contact of the one contact module aligns in a different row with a ground contact of the adjacent contact module. 17. An electrical connector comprising: a housing; andplural contact modules stacked adjacent to each other along a stack axis and held by the housing, each contact module comprising: a contact array including signal contacts and ground contacts arranged in a column, the signal and ground contacts extending between respective mating ends configured to engage a mating connector and terminating ends configured to engage a circuit board;lossy blocks mounted to the ground contacts, each lossy block engaging a different corresponding ground contact, the lossy blocks composed of a lossy material; anda dielectric holder overmolded over the contact array and the lossy blocks to secure the signal contacts, the ground contacts, and the lossy blocks in place relative to the dielectric holder, the mating ends and the terminating ends of the signal contacts and the ground contacts protruding outward from respective front and rear ends of the dielectric holder, the dielectric holder composed of a low loss material that has a loss tangent lower than a loss tangent of the lossy material of the lossy blocks. 18. The electrical connector of claim 17, wherein the signal contacts and the ground contacts are arranged in alternating pairs along a length of the column such that a pair of ground contacts extends between two pairs of signal contacts. 19. The electrical connector of claim 18, wherein the ground contacts in a corresponding pair each have a respective inner side and an outer side opposite to the inner side, the inner sides facing each other and defining an inner gap between the ground contacts, the lossy blocks extending into the inner gaps of corresponding pairs of ground contacts, the lossy blocks not extending laterally outward beyond the outer sides of the ground contacts. 20. The electrical connector of claim 17, wherein the lossy blocks are overmolded over the ground contacts in a first molding stage prior to the dielectric holder being overmolded over the contact array and the lossy blocks in a second molding stage.