This application is related to co-pending U.S. application Ser. No. 14/089,125, filed on Nov. 25, 2013, entitled “ELECTRICAL CABLE ASSEMBLY.”
Electrical cable assemblies can be used to electrically connect one electrical component to another electrical component. For instance, as illustrated in
Still referring to
In accordance with the illustrated example, the contact pads 22 are supported by the lower surface 20b of the substrate 12. Each of the contact pads 22 can be spaced from each other along the lateral direction A and can be disposed proximate to the front end 20d. The contact pads 22 may include a plurality of signal contact pads 22a and a plurality of ground contact pads 22b. Signal contact pads 22a and ground contact pads 22b can be arranged in a row R1. Within row R1, signal contact pads 22a and ground contact pads 22b may be in a repeating signal-signal-ground pattern, a ground-signal-signal pattern, or a signal-ground-signal pattern. Signal contact pads 22a and ground contact pads 22b can also be arranged in a repeating signal-signal-ground-ground pattern, a ground-signal-signal-ground pattern (
With continuing reference to
Referring to
The cables 18 may further include at least one ground conductor, such as drain wires 28b, in addition to signal conductors 28a. The drain wires 28b can be used in combination with the ground jacket 30 or by themselves. The drain wires 28b can be surrounded by the outer layer 34. A drain wire 28b may also be surrounded by the ground jacket 32, when a ground jacket is present.
The cables 18 can be configured to mount to the contact pads 22, for instance at their respective proximal ends 24. Thus, the cables 18 can be in electrical communication with the respective complementary contact pads 22. Each of the cables 18 can be mounted to the substrate 12 in a variety of ways. For instance, a portion of the insulative layers 30 and 34 and the ground jacket 32 of each cable 18 can be removed from the respective conductor 28 at the proximal end 24 so as to expose the conductors 28. Alternatively, the cable 18 can be manufactured such that the conductors 28 extend longitudinally out from the insulating layers 30 and 34 and the ground jacket 32 so as to expose the conductors 28. The exposed conductors 28 can be mounted to respective contact pads 22 at the proximal end 24, for instance by soldering the conductors 28 to the contact pad 22. For instance, signal carrying conductors 28a can define signal mounting portions 36a that are exposed such that the mounting portions 36a extend from an insulative layer along the longitudinal direction L and terminate at the proximal end 24. The signal mounting portions 36a can be mounted to signal contact pads 22a. Similarly, drain wires 28b can define drain mounting portions 36b that are exposed such that the mounting portions 36b extend from an insulative layer along the longitudinal direction L and terminate at the respective proximal end 24. The mounting portions 36b of the drain wires 28b can be mounted to ground contact pads 22b.
Referring to
In connecting high speed signal cables to a substrate, insulating layers of the cable may be removed thereby exposing signal conducts. These exposed signal conductors may result in electromagnetic interference, such as cross talk. Mitigating such electromagnetic interference is desirable.
In accordance with an embodiment, an electrical cable assembly can include an electrical cable and a substrate. The electrical cable can be configured to electrically connect to contact pads that are carried by the substrate. The electrical cable can include at least one electrically conductive signal conductor that can define a first surface that is configured to face the substrate. The signal conductor can define a second surface that is opposite the first surface. The signal conductor can define a first height of at least 0.25 millimeters (mm) and less than 1.0 mm as measured from the first surface to the second surface along a straight line. The electrical cable can further include at least one electrically conductive drain wire disposed adjacent to the at least one signal conductor. At least a portion of the at least one drain wire can define a first surface that is configured to face the substrate and a second surface that is opposite the first surface. The at least one drain wire can define a second height that is greater than 0.2 mm and less than 1.5 mm as measured from the respective first surface to the respective second surface along a straight line.
In accordance with another embodiment, an electrical cable can be configured to electrically connect to contact pads that are carried by a substrate. The electrical cable can include an electrical insulator and first and second electrical signal conductors, and respective portions of each of the first and second electrical signal conductors can be disposed within the insulator. The electrical cable can further include first and second drain wires having respective portions disposed within the insulator and spaced apart from each other along a first direction such that the first and second electrical signal conductors are disposed between the first and second drain wires along the first direction. Each of the first and second drain wires can be elongate along a second direction that is substantially perpendicular to the first direction, and each of the first and second drain wires can define an outer perimeter having first and second opposed surfaces that are spaced from each other along a third direction that is substantially perpendicular to the first and second directions. The electrical cable can further include an electrically conductive auxiliary wire that defines an outer perimeter that is attached to the outer perimeter of at least a select one of the first and second drain wires.
The foregoing summary, as well as the following detailed description of an example embodiment of the application, will be better understood when read in conjunction with the appended drawings, in which there is shown in the drawings example embodiments for the purposes of illustration. It should be understood, however, that the application is not limited to the precise arrangements and instrumentalities shown. In the drawings:
Applicants have recognized that varying the size and/or shape of the drain wires in various configurations reduces cross-talk in high speed signal cables. In particular, applicants have recognized that increasing the height of a drain wire can reduce cross-talk in cable assemblies and/or can increase the density of electrical cable assemblies. While various configurations are described herein with reference to preferred embodiments and/or preferred methods, it should be understood that the words which have been used herein are words of description and illustration, rather than words of limitation, and that the scope of the instant disclosure is not intended to be limited to those particulars, but rather is meant to extend to all structures, methods, and/or uses of the herein described cables. Those skilled in the relevant art, having the benefit of the teachings of this specification, may effect numerous modifications to the electrical cables as described herein, and changes may be made without departing from the scope and spirit of the instant disclosure, for instance as recited in the appended claims.
Referring initially to
The electrical cable 100 can include at least one electrically conductive signal conductor 102, for instance the pair of signal conductors 102 in accordance with the illustrated embodiments, that defines a first or bottom surface 110 that is configured to face the substrate 106 and a second or top surface 112 that is opposite the bottom surface 110. The signal conductor 102 can define a first or signal height SH. The signal height SH can equal at least 0.25 millimeters (mm) and less than 1.0 mm, for instance approximately 0.25 mm, 0.4 mm, or 0.5 mm, as measured from the bottom surface 110 to the top surface 112 surface along a straight line. For instance, and without limitation, the signal conductor 102 can have an American Wire Gauge (AWG) of 36, 32, 30, 26, or 22, and the signal height SH can be about 0.13 mm, 0.2 mm, 0.25 mm, 0.4 mm, 0.64 mm, respectively. The electrical cable 100 can further include at least one electrically conductive drain wire 104, for instance a pair of drain wires 104 in accordance with the illustrated embodiments, that is disposed adjacent to at least one signal conductor 102. At least a portion of at least one drain wire 104 can define a first or bottom surface 109 that is configured to face the substrate 106. At least a portion of the at least one drain wire 104 can further define a second or top surface 108 that is opposite the bottom surface 109. At least one drain wire 104, such as the first and second drain wires 104 in accordance with the illustrated embodiments, can define a second or drain height DH that is greater than 0.12 mm and less than 1.5 mm, for instance greater than 0.2 mm and less than 1.5 mm, as measured from the respective bottom surface 109 to the respective top surface 108 along a straight line. The drain wire 104 can further define an outer perimeter 114. Thus, it can be said that the outer perimeter 114 has the bottom and top surfaces 109 and 108, respectively.
The electrical cable 100 can include a first electrical insulator, such as the outer layer 34 shown in
In accordance with the illustrated embodiments, the signal height SH and the drain height DH are defined at the mounting portions of the signal conductor 102 and the drain wire 104, respectively. For instance,
For instance, the electrical cable 100 can have an American wire gauge (AWG) of approximately 24, and at least a portion of at least one of the drain wires 104 can define a drain height DH that is greater than 40 percent and less than 300 percent of the signal height SH, which can be equal to about 0.5 mm. By way of another example, and without limitation, the electrical cable 100 can have an AWG of approximately 26, and at least a portion of at least one of the drain wires 104 can define a drain height DH that is greater than 50 percent and less than 300 percent of the signal height SH, which can be equal to about 0.4 mm. By way of yet another example, and without limitation, the electrical cable 100 can have an AWG of approximately 30, and at least a portion of at least one of the drain wires 104 can define a drain height DH that is greater than 80 percent and less than 600 percent of the signal height SH, which can be equal to about 0.25 mm.
Referring to
The drain wires 104 can include respective distal ends that are opposite the respective mounting portions 116. For instance, referring to
Referring to
Referring to
In accordance with an example embodiment, less than all of the mounting portion 116 of the drain wire 104 defines the drain height DH. It will be appreciated that at least a portion, for instance all, of the mounting portion 116 can define the drain height DH. Further, drain wires 104 can define the drain height DH along at least a portion, for instance all, of the length of the intermediate wire segment 115 of the drain wire 104. Thus, at least a portion of the intermediate wire segment 115 can define the drain height DH. It will be appreciated that the mounting portions of the drain wires 104 are not limited to defining elliptical cross sections when the width W2 is less than the drain height DH.
Referring again to
Referring to the illustrated embodiment in
In accordance with the illustrated embodiment, the auxiliary wire 118 can attach to the top surface 108 of at least a select one of the first and second drain wires 104. Further, the auxiliary wire 118 can define a first or lower surface 121 that can be attached to the top surface 108 of the select one of the first and second drain wires 104. The auxiliary wire 118 can further define a second or upper surface 122 that is opposite the lower surface 121. The lower surface 121 can be spaced from the upper surface 122 an auxiliary distance AD. The top and bottom surfaces 108 and 109, respectively, of the mounting portion of the drain wire 104 can be spaced apart a drain distance DD. In accordance with the illustrated embodiment, the drain distance DD can be substantially equal to the auxiliary distance AD. It will be appreciated that the drain distance DD and the auxiliary distance AD can vary as desired, for instance the auxiliary distance AD can be greater than the drain distance DD or less than the drain distance DD. It will be further appreciated that auxiliary wires can be electrically attached to drain wires using any appropriate attachment mechanism as desired, such as welding, soldering, applying a conductive adhesive, potting in conductive material, or a combination thereof.
Still referring to
In accordance with the illustrated embodiment of
The second height H2 can be greater than 0.12 millimeters (mm) and less than 1.5 mm, for instance greater than 2.0 mm and less than 1.0 mm, for instance 0.5 mm or 0.6 mm. It will be appreciated that while the illustrated embodiment shows a stack of only one auxiliary wire 118 on each drain wire 104, one or more auxiliary wires, for instance 2, 3, 4, or 5, can be stacked along the transverse direction T in any desired arrangement. Further, it will be appreciated that auxiliary wires 118 can be attached to other surfaces of the drain wire 104 as desired. The auxiliary wires 118 can define a length that is at least a portion, for instance all, of the length of the mounting portion of the drain wire 104. For instance, the auxiliary wire 118 can ride along at least a portion, for instance all, of the drain wire 104. Thus, at least a portion of a mounting portion, for instance all, of the drain wire 104 can carry at least one auxiliary wire 118. In one embodiment, the distance between two signal conductor pairs 102 along the lateral direction A does not change as the second height H2 is increased, thereby reducing crosstalk. In another embodiment, the distance between two signal conductor pairs can decrease as the second height H2 is increased so as increase the density (e.g., decrease the distance between signal pairs) of an electrical cable 100.
Referring to the illustrated embodiment in
Referring again to
It will be appreciated that a method for reducing crosstalk can include fabricating electrical cables as described above. Further, it will be appreciated that a method for increasing the density of an electrical cable can include defining drain wires and/or auxiliary wires as described herein. For instance, drain wires and signal conductors can be spaced closer together in the electrical cables described herein than they are spaced from each other in conventional cables while achieving no more crosstalk, for instance less crosstalk, than the crosstalk that is present in conventional cables.
Although the electrical cable assembly has been described herein with reference to preferred embodiments and/or preferred methods, it should be understood that the words which have been used herein are words of description and illustration, rather than words of limitation, and that the scope of the instant disclosure is not intended to be limited to those particulars, but rather is meant to extend to all structures, methods, and/or uses of the herein described cable retention housing. Those skilled in the relevant art, having the benefit of the teachings of this specification, may effect numerous modifications to the electrical cable assembly as described herein, and changes may be made without departing from the scope and spirit of the instant disclosure, for instance as recited in the appended claims.
For instance, it should be appreciated that a means for using one or more drain wires for reducing the crosstalk between signal conductors in, for example, an electrical cable assembly may include increasing the height of a drain wire as described above. Similarly, it should be appreciated that a means for increasing the density of an electrical cable may include increasing the height of a drain wire as described above. The electrical cable, and thus an electrical cable assembly, may include means for increasing the height of a drain wire. For instance, an electrical cable may include means for disposing respective portions of a first electrical signal conductor and a second electrical signal conductor within an insulator; a means for disposing respective portions of first and second drain wires within the insulator; and a means for spacing the first and second drain wires apart from each other along a first direction such that the first and second electrical signal conductors are disposed between the first and second drain wires along the first direction. The first and second drain wires can be elongate along a second direction that is substantially perpendicular to the first direction, and each of the first and second drain wires can define an outer perimeter that has first and second opposed surfaces that are spaced from each other along the first direction. The electrical cable, and thus the electrical cable assembly, can include a means for electrically attaching an auxiliary wire to at least a select one of the first and second drain wires. For instance, the auxiliary wire can define an outer perimeter that can attach to the outer perimeter of at least the select one of the first and second drain wires. In an example embodiment, the electrical cable, and thus the electrical cable assembly, can include a means for electrically attaching one auxiliary wire to the top of a first drain wire, and a second auxiliary wire to the top of a second auxiliary wire. In yet another example embodiment, the electrical cable, and thus the electrical cable assembly, can include a means for electrically attaching one auxiliary wire to the top of a first drain wire that is attached to the substrate, and a means for electrically attaching a second drain wire to the top of a second auxiliary wire, the second auxiliary wire attached to the substrate.
At least one electrically conductive signal conductor can include a means to configure a first surface to face the substrate and a second surface to be spaced opposite the first surface. The signal conductor can define a first height of at least 0.2 mm, for instance at least 0.25 millimeters (mm) and less than 1.0 mm, as measured from the first surface to the second surface along a straight line. At least one electrically conductive drain wire can include a means to configure a first surface to face the substrate and second surface to be spaced opposite the first surface. The drain wire can define a second height of at least 0.12 mm, for instance at least 0.2 mm and less than 1.5 mm, as measured from the respective first surface and the respective second surface along a straight line.
Additionally, a means for fabricating an electrical cable is described herein. An electrical cable, and thus an electrical cable assembly, may include a means for defining a first surface of a drain wire of the electrical cable and a second surface of the drain wire that is opposite the first surface. The electrical cable can include a means for configuring the first surface to face a substrate. The electrical cable can further include a means for attaching an electrically conductive auxiliary wire to the second surface of the drain wire so as to define a height that is measured from the first surface to a surface of the auxiliary wire along a straight line, the height being greater than 0.12 mm, for instance greater than 0.2 millimeters and less than 1.5 mm.
Another means for fabricating an electrical cable is described herein. An electrical cable, and thus an electrical cable assembly, can include a means for defining a first surface of at least one drain wire and a second surface of the drain wire that is opposite the first surface so as to define a height that is measured from the first surface to the second surface along a straight line. The electrical cable can include a means for configuring the first surface to face that substrate. The electrical cable can further include a means for compressing at least a portion of the drain wire until the height is at least greater than 0.12 millimeters (mm), for instance greater than 0.2 mm and less than 1.5 mm.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/747,437 filed Dec. 31, 2012, the disclosure of which is hereby incorporated by reference as if set forth in its entirety herein.
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