DIFFERENTIAL SIGNALING CABLE, TRANSMISSION CABLE ASSEMBLY USING SAME, AND PRODUCTION METHOD FOR DIFFERENTIAL SIGNALING CABLE

• US 20110083877A1
• Filed: 09/13/2010
• Published: 04/14/2011
• Est. Priority Date: 10/14/2009
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Kumakura, Takashi, SUGIYAMA, Takahiro, Nounen, Hideki, Ishimatsu, Yosuke
• Granted Patent: US 9,123,452 B2
• Time in Patent Office: Days
• US Class Current: 174/115
• CPC Class Codes: H01B 11/1025 composed of a helicoidally wound tape-conductor
• CPC Class Codes: H01B 11/1033 composed of a wire-braided conductor
• CPC Class Codes: H01B 11/1091 with screen grounding means, e.g. drain wires
• CPC Class Codes: H01B 11/20 Cables having a multiplicity of coaxial lines
• CPC Class Codes: H01B 7/0823 Parallel wires, incorporated in a flat insulating profile
• CPC Class Codes: H01P 11/001 Manufacturing waveguides or transmission lines of the waveguide type
• CPC Class Codes: H01P 3/02 with two longitudinal conductors

Abstract

A differential signaling cable according to the present invention comprises: a pair of signal conductors provided in parallel; an insulator which covers the periphery of the pair of signal conductors in a batch; and a shield conductor provided on the outer periphery of the insulator, in which an interval between the pair of signal conductors is specified so that even-mode impedance becomes 1.5 to 1.9 times odd-mode impedance.

Claims

1. A differential signaling cable, comprising:

a pair of signal conductors provided in parallel;

an insulator covering a periphery of said pair of signal conductors as a whole; and

a shield conductor provided on an outer periphery of said insulator, wherein

an interval between said pair of signal conductors is specified so that even-mode impedance becomes 1.5 to 1.9 times odd-mode impedance.

2. The differential signaling cable according to claim 1, wherein:

a length of said insulator in its width direction in which said pair of signal conductors is arranged is made longer than a length in its thickness direction perpendicular to the width direction; and

said pair of signal conductors is disposed at a center of the thickness direction of said insulator.

3. The differential signaling cable according to claim 2, wherein a ratio of the length of said insulator in its width direction to the length in its thickness direction is 2:

1.

4. The differential signaling cable according to claim 2, further comprising:

a drain wire longitudinally disposed on an end on one side or ends on both sides of said insulator in its width direction, said drain wire being provided between said insulator and said shield conductor, said drain wire being electrically connected to said shield conductor.

5. The differential signaling cable according to claim 4, wherein said drain wire and said signal conductor are linearly disposed along the width direction of said insulator.

6. The differential signaling cable according to claim 4, wherein:

each of said drain wires is disposed on the ends on both sides of said insulator in its width direction;

both of said drain wires are linearly disposed along the width direction of said insulator; and

both of said drain wires are disposed in locations deviating from the center of the thickness direction of said insulator.

7. The differential signaling cable according to claim 4, wherein which said drain wire is engaged with an engagement groove formed on the end on one side or the ends on both sides of said insulator in its width direction.

8. A transmission cable assembly, wherein:

at least two or more of differential signaling cables according to claim 1 are bundled;

a batch-covering shield conductor is provided on a periphery of the bundled cables as a whole; and

an outer periphery of said batch-covering shield conductor is covered with a jacket made of an insulator.

9. A production method for a differential signaling cable comprising a pair of signal conductors provided in parallel, an insulator covering a periphery of the pair of signal conductors as a whole, and a shield conductor provided on an outer periphery of the insulator, wherein:

each conductor of said pair of signal conductors is disposed such that an interval therebetween is specified as even-mode impedance becomes 1.5 to 1.9 times odd-mode impedance; and

said insulator is formed in a batch on the periphery of said pair of signal conductors by means of extrusion molding.