Electrical connector with hybrid shield
An electrical connector with reduced cross talk and controlled impedance. The connector comprises hybrid shields with lossy portions and conductive portions. The synergistic effect of the lossy portions and the conductive portions allows the hybrid shields to be relatively thin such that they can be incorporated into the mating interface regions or other mechanically constrained regions of the connector to provide adequate crosstalk suppression without undesirably impacting impedance. The conductive portions may be shaped to preferentially position the conductive regions adjacent signal conductors susceptible to cross talk to further contribute to the synergy. The conductive regions may include holes to contribute to desired electrical properties for the connector.
1. An electrical connector comprising:
a plurality of conductive elements, wherein:
each conductive element of the plurality of conductive elements comprises a contact tail adapted to be attached to a printed circuit board, a mating contact, and an intermediate portion between the contact tail and the mating contact;
the mating contacts of the plurality of conductive elements are arranged in a column; and
the plurality of conductive elements comprise first and second conductive elements; and
a hybrid shield comprising a conductive layer and a lossy layer, wherein the electrical connector comprises an intermediate region and a mating interface region separate from the intermediate region;
the intermediate portions of the first and second conductive elements are disposed within the intermediate region;
the mating contacts of the first and second conductive elements are disposed within the mating interface region; and
the hybrid shield is disposed within the mating interface region.
2. The electrical connector of claim 1 , wherein:
the plurality of conductive elements further comprises third and fourth conductive elements;
the first and second conductive elements form a first differential pair adapted to carry a first differential signal;
the third and fourth conductive elements form a second differential pair adapted to carry a second differential signal; and
the hybrid shield is elongated in a first direction, the first direction being parallel to the column comprising the mating contact portions of the first, second, third, and fourth conductive elements.
3. The electrical connector of claim 2 , wherein the column is a first column, and wherein:
the electrical connector further comprises fifth and sixth conductive elements;
each of the fifth and sixth conductive elements comprises a contact tail adapted to be attached to a printed circuit board, a mating contact, and an intermediate portion between the contact tail and the mating contact;
the mating contacts of the fifth and sixth conductive elements are arranged in a second column, the second column being parallel to, and offset from, the first column; and
the hybrid shield is disposed between the first and second columns.
4. The electrical connector of claim 3 , wherein:
the fifth and sixth conductive elements form a third differential pair adapted to carry a third differential signal; and
the hybrid shield is disposed between the first and third differential pairs.
5. The electrical connector of claim 1 , wherein:
the hybrid shield comprises a lossy member having attached thereto a conductive layer.
6. The electrical connector of claim 5 , wherein:
the lossy member comprises a material having a bulk conductivity between 10 siemens/meter and 100 siemens/meter.
7. The electrical connector of claim 5 , wherein:
the lossy member comprises a material having a bulk conductivity between 40 siemens/meter and 60 siemens/meter.
8. The electrical connector of claim 5 , wherein:
the lossy member has a thickness between 5 mils and 100 mils.
9. The electrical connector of claim 5 , wherein:
the conductive layer comprises a conductive coating.
10. The electrical connector of claim 5 , wherein:
the conductive layer comprises a sheet of metal foil.
11. The electrical connector of claim 5 , wherein:
the conductive layer has a thickness between 1 mil and 5 mils.
12. The electrical connector of claim 1 , wherein:
the hybrid shield comprises a surface facing the first conductive element; and
the surface comprises one or more lossy regions and one or more conductive regions.
13. The electrical connector of claim 12 , wherein:
a total area of the one or more lossy regions is greater than a total area of the one of more conductive regions.
14. The electrical connector of claim 13 , wherein:
the conductive portion of the hybrid shield comprises a plurality of conductive regions; and
at least one conductive region of the plurality of conductive regions is aligned with the first and second conductive elements.
15. The electrical connector of claim 1 , wherein:
the conductive portion of the hybrid shield comprises a conductive region formed on the lossy portion; and
the conductive region comprises at least one hole through which lossy material of the lossy portion is exposed.
16. The electrical connector of claim 15 , wherein:
the at least one hole has a dimension that is selected based at least in part on an operating frequency range for which the electrical connector is designed.
17. The electrical connector of claim 16 , wherein:
the dimension of the at least one hole is less than half of a wavelength of a highest frequency in the operating frequency range.
18. An electrical connector comprising:
a plurality of conductive elements, wherein:
each conductive element of the plurality of conductive elements comprises a contact tail adapted to be attached to a printed circuit board, a mating contact, and an intermediate portion between the contact tail and the mating contact;
the mating contacts of the plurality of conductive elements are arranged in a column; and
the plurality of conductive elements comprise first and second conductive elements; and
a hybrid shield comprising a conductive layer and a lossy layer, wherein:
the hybrid shield is disposed between the mating contact of the first conductive element and the mating contact of the second conductive element.
19. An electrical connector comprising:
a plurality of conductive elements, wherein:
each conductive element of the plurality of conductive elements comprises a contact tail adapted to be attached to a printed circuit board, a mating contact, and an intermediate portion between the contact tail and the mating contact;
the plurality of conductive elements are arranged in a column;
the plurality of conductive elements comprise first, second, third, and fourth conductive elements,
the first and second conductive elements form a first differential pair adapted to carry a first differential signal; and
the third and fourth conductive elements form a second differential pair adapted to carry a second differential signal;
a lossy layer that is elongated in a first direction, the first direction being parallel to the column comprising the plurality of conductive elements; and
a conductive layer that comprises first and second conductive portions, wherein:
the first and second conductive portions are in electrical contact with the lossy layer;
the first conductive portion is aligned with the first differential pair comprising the first and second conductive elements; and
the second conductive portion is aligned with the second differential pair comprising the third and fourth conductive elements.