Flexible shielded cable

• US 8,110,744 B2
• Filed: 08/19/2008
• Issued: 02/07/2012
• Est. Priority Date: 08/19/2008
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Wong, Suinin William, Lam, Cheung-Wei
• Primary Examiner(s): Nguyen, Chau N
• Application Number:
  US12/193,850
• Publication Number:
  US 20100044067A1
• Time in Patent Office: 1,267 Days
• Field of Search: 174/117.F, 174/117.FF, 174/36, 174/250
• US Class Current: 174/117.F
• CPC Class Codes: H01B 7/0861 comprising one or more screens

Abstract

A flexible shielded cable is disclosed. The cable may include a plurality of conductors formed on a common base, a dielectric material disposed about the plurality of conductors, and a shielding material disposed adjacent the dielectric material. At least one of the plurality of conductors may include an unshielded portion not overlaid by the shielding material and at least one of the plurality of conductors may include a shielded portion overlaid by the shielding material.

Claims

1. A flexible cable, comprising:

a plurality of conductors formed on a common base;

a dielectric material disposed about the plurality of conductors; and

a shielding material disposed adjacent the dielectric material;

wherein at least one of the plurality of conductors includes an unshielded portion, implemented using microstrip technology, not overlaid by the shielding material and further including a first section with a first flexibility and a second section with a second flexibility, wherein the first flexibility is greater than the second flexibility, and the locations of the first and second sections correspond to the physical routing of the flexible cable; and

at least one of the plurality of conductors includes a shielded portion, implemented using stripline technology, overlaid by the shielding material.

2. The flexible cable of claim 1, wherein the at least one conductor with the unshielded portion is part of a group of unshielded conductors each of which includes at least one portion that is unshielded.

3. The flexible cable of claim 2, wherein the number of conductors within the group of unshielded conductors and the number of conductors within a group of shielded conductors determines a flexibility ratio of the flexible cable.

4. The flexible cable of claim 3, wherein the group of unshielded conductors are implemented using microstrip technology and the group of shielded conductors are implemented using stripline technology.

5. The flexible cable of claim 1, wherein the shielding material is selectively disposed about the dielectric material.

6. The flexible cable of claim 1, wherein the at least one conductor with the unshielded portion conveys a signal substantially constant with respect to time.

7. The flexible cable of claim 1, wherein the at least one conductor with the unshielded portion conveys a signal that contains more than a predetermined level of noise and the location of the unshielded portion corresponds to the physical routing of the flexible cable.

8. The flexible cable of claim 1, wherein the shielding material is segmented such that it is selectively removable and the unshielded portion is formed after the flexible cable is manufactured.

9. The flexible cable of claim 1, wherein the shielding material is selectively disposed along the length of the at least one conductor with the unshielded portion such that a first section along the length of the at least one conductor is substantially void of shielding material and a second section along the length of the at least one conductor includes a greater amount of shielding material than the first section.

10. A method of manufacturing a flexible cable, the method comprising the operations of:

forming a plurality of conductors on a common base;

disposing a dielectric material about the plurality of conductors;

disposing a shielding material adjacent the dielectric material;

whereby at least one of the plurality of conductors includes an unshielded portion, implemented using microstrip technology, not overlaid by the shielding material and further including a first section with a first flexibility and a second section with a second flexibility, wherein the first flexibility is greater than the second flexibility, and the locations of the first and second sections correspond to the physical routing of the flexible cable; and

at least one of the plurality of conductors includes a shielded portion, implemented using stripline technology, overlaid by the shielding material.

11. The method of claim 10, whereby the at least one conductor with the unshielded portion is part of a group of unshielded conductors each of which includes at least one portion that is unshielded.

12. The method of claim 11, whereby the at least one conductor with the shielded portion is part of a group of shielded conductors each of which includes at least one portion that is shielded.

13. The method of claim 10, whereby the operation of disposing the shielding material comprises the operation of selectively disposing the shielding material about the dielectric material.

14. The method of claim 10, whereby the at least one conductor with the unshielded portion conveys a signal substantially constant with respect to time.

15. The method of claim 10, further comprising the operation of locating the unshielded portion to accommodate a location on the at least one conductor where routing flexibility is desired.

16. A computer system comprising:

a first operating component;

a second operating component;

a cable coupling at least the first operating component to the second operating component, the cable comprising;

a plurality of conductors formed on a common base;

a dielectric material disposed about the plurality of conductors; and

a shielding material disposed adjacent the dielectric material;

wherein at least one of the plurality of conductors includes an unshielded portion, implemented using microstrip technology, not overlaid by the shielding material and further including a first section with a first flexibility and a second section with a second flexibility, wherein the first flexibility is greater than the second flexibility, and the locations of the first and second sections correspond to the physical routing of the flexible cable; and

at least one of the plurality of conductors includes a shielded portion, implemented using stripline technology, overlaid by the shielding material.

17. The computer system of claim 16, wherein the at least one conductor including the unshielded portion and the at least one conductor including the shielded portion are the same conductor and the unshielded and shielded portions are interleaved along the length of the at least one of the plurality of conductor.

18. The computer system of claim 17, wherein the interleaving corresponds to a predetermined level of noise within the at least one of the plurality of conductors.

19. The computer system of claim 16, wherein the unshielded portion is created based upon one or more signals communicated between the first and second operating components.