Cable For High Speed Data Communications

• US 20090229850A1
• Filed: 03/11/2008
• Published: 09/17/2009
• Est. Priority Date: 03/11/2008
• Status: Abandoned Application

• Current Assignee: GlobalFoundries, Inc.
• Original Assignee: International Business Machines Corporation
• Inventors: Mutnury, Bhyrav M., Cases, Moises, Wilkie, Bruce J.
• Application Number:
  US12/045,899
• Publication Number:
  US 20090229850A1
• Time in Patent Office: Days
• US Class Current: 174/102.R
• CPC Class Codes: H01B 11/183 Co-axial cables with at least one helicoidally wound tape-conductor
• CPC Class Codes: H01B 11/20 Cables having a multiplicity of coaxial lines

Abstract

A cable for high speed data communications and methods for manufacturing such cable are disclosed, the cable including a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer. The cable also includes conductive shield material wrapped in a rotational direction at a wrap rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps of the conductive shield material along and about the longitudinal axis, an inner surface of the conductive shield material roughened to reduce non-linear attenuation of signals transmitted through the conductive shield material. Transmitting signals on the cable including transmitting a balanced signal characterized by a frequency in the range of 7-9 gigahertz on the cable.

Claims

1. A method of manufacturing a cable for high speed data communications, the method comprising:

wrapping, in a rotational direction at a wrap rate along and about a longitudinal axis, conductive shield material around a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer, including overlapping wraps of the conductive shield material along and about the longitudinal axis, an inner surface of the conductive shield material roughened to reduce non-linear attenuation of signals transmitted through the conductive shield material, the roughness of the inner surface of the conductive shield material varying in intensity along the conductive shield material.

3. The method of claim 1 wherein:

the overlapped wraps of the conductive shield material create a bandstop filter that attenuates signals at frequencies in a stopband; and

the roughened inner surface of the conductive shield material reduces the attenuation of signals having frequencies in the stopband.

4. The method of claim 3 wherein the stopband is characterized by a center frequency, and the center frequency is dependent upon the composition of the conductive shield material, the width of the conductive shield material, and the wrap rate.

5. The method of claim 1 wherein:

wrapping conductive shield material around the first inner conductor enclosed by the first dielectric layer and the second inner conductor enclosed by the second dielectric layer further comprises wrapping conductive shield material around the inner conductors, the dielectric layers, and also a drain conductor.

6. The method of claim 1 further comprising:

enclosing the conductive shield material and the first and second inner conductors in a non-conductive layer.

7. The method of claim 1 wherein the conductive shield material comprises a strip of aluminum foil having a width that is relatively small with respect to the length of the cable.

2. (canceled)

8. A method of transmitting a signal on a cable for high speed data communications, the method comprising:

transmitting a balanced signal characterized by a frequency in the range of 7-9 gigahertz on a cable, the cable comprising;

a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer; and

conductive shield material wrapped in a rotational direction at a wrap rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps of the conductive shield material along and about the longitudinal axis, an inner surface of the conductive shield material roughened to reduce non-linear attenuation of signals transmitted through the conductive shield material, the roughness of the inner surface of the conductive shield material varying in intensity along the conductive shield material.

10. The method of claim 8 wherein:

the overlapped wraps of the conductive shield material create a bandstop filter that attenuates signals at frequencies in a stopband; and

the roughened inner surface of the conductive shield material reduces the attenuation of signals having frequencies in the stopband.

11. The method of claim 10 wherein the stopband is characterized by a center frequency, and the center frequency is dependent upon the composition of the conductive shield material, the width of the conductive shield material, and the wrap rate.

12. The method of claim 8 wherein:

conductive shield material wrapped around the first inner conductor enclosed by the first dielectric layer and the second inner conductor enclosed by the second dielectric layer further comprises conductive shield material wrapped around the inner conductors, the dielectric layers, and also a drain conductor.

13. The method of claim 8 wherein the conductive shield material comprises a strip of aluminum foil having a width that is relatively small with respect to the length of the cable.

9. (canceled)

14. A cable for high speed data communications, the cable comprising:

a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer; and

conductive shield material wrapped in a rotational direction at a wrap rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps of the conductive shield material along and about the longitudinal axis, an inner surface of the conductive shield material roughened to reduce non-liner attenuation of signals transmitted through the conductive shield material, the roughness of the inner surface of the conductive shield material varying in intensity along the conductive shield material.

16. The cable of claim 14 wherein:

the overlapped wraps of the conductive shield material create a bandstop filter that attenuates signals at frequencies in a stopband; and

the roughened inner surface of the conductive shield material reduces the attenuation of signals having frequencies in the stopband.

17. The cable of claim 16 wherein the stopband is characterized by a center frequency, and the center frequency is dependent upon the composition of the conductive shield material, the width of the conductive shield material, and the wrap rate.

18. The cable of claim 14 wherein:

conductive shield material wrapped around the first inner conductor enclosed by the first dielectric layer and the second inner conductor enclosed by the second dielectric layer further comprises conductive shield material wrapped around the inner conductors, the dielectric layers, and also a drain conductor.

19. The cable of claim 14 wherein the cable further comprises a non-conductive layer that encloses the conductive shield material and the first and second inner conductors.

20. The cable of claim 14 wherein the conductive shield material comprises a strip of aluminum foil having a width that is relatively small with respect to the length of the cable.

15. (canceled)