Shielded cable assembly

Patent metadata

Field	Value
Publication number	US-11336058-B2
Application number	US-201514717345-A
Country	US
Kind code	B2
Filing date	May 20, 2015
Priority date	Mar 14, 2013
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

A shielded cable assembly capable of transmitting signals at speeds of 3.5 Gigabits per second (Gb/s) or higher without modulation or encoding over a single pair of conductors. The cable has a characteristic impedance of 95 Ohms and can support transmission data according to either USB 3.0 or HDMI 1.4 performance specifications. The wire cable includes a pair of conductors, a shield surrounding the conductors, and a dielectric structure configured to maintain a first predetermined spacing between the conductors and a second predetermined spacing between said conductors and said shield. The shield includes an inner shield conductor enclosing the dielectric structure and an outer shield conductor enclosing the inner shield conductor.

First claim

We claim:

1. An assembly configured to transmit electrical signals, comprising:
a wire cable having
a first inner conductor and a second inner conductor, both having a generally round cross section and having an overall diameter in a range of 0.203 mm to 0.321 mm;
a shield surrounding the first inner conductor and the second inner conductor; and
a dielectric structure having an at least nearly round cross section comprising a first dielectric insulator enclosing the first inner conductor and a second dielectric insulator enclosing the second inner conductor, wherein the first and second dielectric insulators are formed of polypropylene and have a thickness of about 0.85 mm, said dielectric structure configured to maintain a first predetermined spacing between the first inner conductor and the second inner conductor, a second predetermined spacing between the first inner conductor and the shield and a third predetermined spacing between the second inner conductor and the shield, wherein the first dielectric insulator is integral with the second dielectric insulator and the first dielectric insulator and the second dielectric insulator are bonded together, thereby providing lateral spacing between the first inner conductor and the second inner conductor, wherein the dielectric structure further comprises a third dielectric insulator enclosing the first dielectric insulator and the second dielectric insulator, wherein the third dielectric is formed of polyethylene and has a diameter of about 2.2 mm, and wherein the shield comprises
an inner shield conductor at least partially enclosing the dielectric structure, thereby establishing a characteristic impedance of the wire cable, wherein the inner shield conductor is formed of an aluminized biaxially oriented polyethylene terephthalate film having a thickness of less than or equal to 0.04 mm, and
an outer shield conductor at least partially enclosing the inner shield conductor and in electrical communication with the inner shield conductor, wherein the wire cable has a characteristic impedance of 95 Ohms and an intra-pair skew of less than 50 picoseconds.

2. The assembly according to claim 1 , wherein said assembly does not include a separate drain wire conductor.

3. The assembly according to claim 1 , wherein the inner shield conductor is formed of the aluminized biaxially oriented polyethylene terephthalate film wrapped about the dielectric structure such that a seam formed by the inner shield conductor is substantially parallel to a longitudinal axis of the wire cable and wherein a lateral length of the inner shield conductor covers at least 100 percent of a dielectric structure circumference.

4. The assembly according to claim 1 , wherein the first inner conductor and the second inner conductor are not twisted one about the other.

5. The assembly according to claim 1 , wherein the wire cable is characterized as having a differential insertion loss of less than 1.5 decibels (dB) for a signal with signal frequency content less than 100 Megahertz (MHz), less than 5 dB for a signal with signal frequency content between 100 MHz and 1.25 Gigahertz (GHz), less than 7.5 dB for a signal with signal frequency content between 1.25 GHz and 2.5 GHz, and less than 25 dB for a signal with signal frequency content between 2.5 GHz and 7.5 GHz when having a length of 7 meters or less.

6. The assembly according to claim 1 , wherein the outer shield conductor is formed of a plurality of woven conductors having a thickness that is less than or equal to 0.30 mm and wherein the outer shield conductor is in contact with at least 65 percent of an outer surface of the inner shield.

7. The assembly according to claim 6 , wherein the outer shield conductor is contained within a jacket formed of a polyvinyl chloride material having a thickness of about 0.2 mm.

8. The assembly according to claim 1 , wherein the assembly further comprises at least one electrical connector selected from a group consisting of a plug connector and a receptacle connector has:
wherein the plug connector has:
a first plug terminal including a first connection portion characterized by a generally rectangular cross section, and
a second plug terminal including a second connection portion characterized by a generally rectangular cross section, wherein the first and second plug terminals are configured to be attached to the first and second inner conductor respectively and wherein the first and second plug terminals form a mirrored pair having bilateral symmetry about a longitudinal axis of the wire cable; and

wherein the receptacle connector configured to mate with said plug connector has:
a first receptacle terminal including a first cantilever beam portion characterized by a generally rectangular cross section and defining a convex first contact point depending from the first cantilever beam portion, said first contact point configured to contact the first connection portion of the first plug terminal, and
a second receptacle terminal including a second cantilever beam portion characterized by a generally rectangular cross section and defining a convex second contact point depending from the second cantilever beam portion, said second contact point configured to contact the second connection portion of the second plug terminal, wherein the first and second receptacle terminals are configured to be attached to the first and second inner conductor respectively, wherein the first and second receptacle terminals form a mirrored terminal pair having bilateral symmetry about the longitudinal axis and wherein when the plug connector is connected to the receptacle connector, a major width of the first connection portion is substantially perpendicular to a major width of the first cantilever beam portion, and a major width of the second connection portion is substantially perpendicular to a major width of the second cantilever beam portion.

9. The assembly according to claim 8 , wherein the assembly further comprises at least one electrically conductive shield selected from a group consisting of a plug shield and a receptacle shield has:
wherein the plug shield electrically isolated from the plug connector and longitudinally surrounding the plug connector; and
wherein the receptacle shield electrically isolated from the receptacle connector and longitudinally surrounding the receptacle connector, wherein the electrically conductive shield defines a pair of wire crimping wings that are mechanically connected to the outer shield conductor, thereby electrically connecting the electrically conductive shield to the inner shield conductor, thereby establishing the characteristic impedance of the assembly.

10. The assembly according to claim 9 , wherein the receptacle shield defines an embossment proximate a location of a connection between the first inner conductor and the first receptacle terminal and a connection between the second inner conductor and the second receptacle terminal.

11. The assembly according to claim 10 , wherein the assembly having the wire cable up to 7 meters in length is characterized as having a differential insertion loss of less than 1.5 dB for a signal with signal frequency content less than 100 MHz, less than 5 dB for a signal with signal frequency content between 100 MHz and 1.25 GHz, less than 7.5 dB for a signal with signal frequency content between 1.25 GHz and 2.5 GHz, and less than 25 dB for a signal with signal frequency content between 2.5 GHz and 7.5 GHz.

12. The assembly according to claim 9 , wherein the electrically conductive shield defines a prong that is configured to penetrate the dielectric outer layer, thereby inhibiting rotation of the electrically

Assignees

• Aptiv Tech Ltd

Inventors

• Liptak Nicole L
• Taylor Bruce D
• Boyer Richard J

Classifications

• H01R13/65915

  Twisted pair of conductors surrounded by shield · CPC title

• H01B11/1033

  composed of a wire-braided conductor · CPC title

• H01B11/1091

  with screen grounding means, e.g. drain wires · CPC title

• H01R13/6592

  the conductive member being a shielded cable · CPC title

• H01R13/6581 Primary

  Shield structure · CPC title