REDUCING SIGNAL LOSS IN CABLES

• US 20140124236A1
• Filed: 11/06/2013
• Published: 05/08/2014
• Est. Priority Date: 11/06/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Ng, Nathan N., Kim, Min Chul, Vu, My, Squire, Jason
• Granted Patent: US 9,349,507 B2
• Time in Patent Office: Days
• US Class Current: 174/106.R
• CPC Class Codes: H01B 11/1025 composed of a helicoidally wound tape-conductor
• CPC Class Codes: H01B 11/1091 with screen grounding means, e.g. drain wires

Abstract

Cables capable of high-speed data transmission and having a low insertion loss. Examples may mitigate the effect of the suckout component of insertion loss by providing cables that eliminated, shift, or reduce the suckout. Examples may eliminate, or at least partially eliminate, the suckout component by providing a continuous return path. Others may shift the frequency of the suckout component to a high frequency where it no longer interferes or significantly attenuates signals being conveyed by the cable. Still others may reduce or control the magnitude of the suckout component.

Claims

1. A cable comprising:

a first twisted pair twisted in a first direction to have a first lay length, the twisted pair including a first conductor and a second conductor; and

a tape layer wrapped around the first twisted pair in the first direction and having a second lay length,

wherein the first lay length and the second lay length are at least approximately equal.

2. The cable of claim 1 wherein the first lay length and the second lay length are equal.

3. The cable of claim 1 further comprising a drain wire inside the tape layer.

4. The cable of claim 3 further comprising a shield layer inside the tape layer.

5. The cable of claim 4 wherein the shield layer comprises a plurality of conductors twisted around the first twisted pair to have a third lay length, the third lay length at least approximately equal to the first lay length.

6. The cable of claim 5 wherein the plurality of conductors are twisted around the first twisted pair in the first direction.

7. A cable comprising:

a first twisted pair twisted in a first direction to have a first lay length, the twisted pair including a first conductor and a second conductor;

a shield layer comprising a plurality of conductors twisted around the first twisted pair in the first direction to have a second lay length, the second lay length at least approximately equal to the first lay length; and

a tape layer wrapped around the shield layer.

8. The cable of claim 7 wherein the tape layer has a third lay length and the first lay length and the third lay length are at least approximately equal.

9. The cable of claim 8 wherein the tape layer is wrapped around the first twisted pair in the first direction.

10. The cable of claim 8 further comprising a drain wire inside the tape layer.

11. A cable comprising:

a first twisted pair twisted to have a first lay length, the twisted pair including a first conductor and a second conductor;

a shield layer comprising a plurality of conductors twisted around the first twisted pair to have a second lay length; and

a tape layer wrapped around the shield layer, the tape layer having a third lay length,

wherein the second lay length and the third lay length are mismatched such that they form a continuous return path for the length of the cable.

12. The cable of claim 11 wherein the shield layer is twisted around the first twisted pair in a first direction and the tape layer is wrapped around the first twisted pair in the first direction.

13. The cable of claim 11 wherein the first twisted pair is twisted in the first direction.

14. A cable comprising:

a first twisted pair twisted to have a first lay length, the twisted pair including a first conductor and a second conductor;

a drain wire twisted with the first twisted pair to have the first lay length;

a shield layer comprising a plurality of conductors twisted around the first twisted pair to have a second lay length; and

a tape layer wrapped around the shield layer, the tape layer having a third lay length.

15. The cable of claim 14 further comprising a second drain wire twisted with the first twisted pair to have the first lay length.

16. The cable of claim 14 wherein the second lay length is at least approximately equal to the third lay length.

17. The cable of claim 16 wherein the first lay length is at least approximately equal to the second lay length and the third lay length.

18. A cable comprising:

a first twisted pair twisted in a first direction to have a first lay length, the twisted pair including a first conductor and a second conductor; and

a tape layer wrapped around the first twisted pair in the first direction and having a second lay length,

wherein the first lay length and the second lay length are different by a factor of two or greater.

19. The cable of claim 18 wherein the first lay length is greater than the second lay length by at least a factor of five.

20. The cable of claim 18 wherein the second lay length is greater than the first lay length by at least a factor of five.

21. A cable comprising:

a first twisted pair twisted in a first direction to have a first lay length, the twisted pair including a first conductor and a second conductor; and

a tape layer having a first width and wrapped around the first twisted pair in the first direction, the tape layer having a second lay length,

wherein at least one of the first width or second lay length are variable.