# US 2019/0172610 A1 · Twinax cable and multi-core cable

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- Number: US 2019/0172610 A1
- Document ID: US20190172610A1
- Status: Published application
- Kind: A1
- Application number: 16/321,530
- Filed: 2018-06-20
- Published: 2019-06-06
- Earliest claimed: 2017-10-25
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Nayu YANAGAWA; Shinya NISHIKAWA; Taro FUJITA; Yuto KOBAYASHI; Masaki HAYAKAWA; Atsushi TSUJINO; Yuji OCHI
- Web page: https://patentgrep.com/patent/US20190172610A1

## CPC

- H01B 11/06: with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B 3/44: vinyl resins; acrylic resins (silicones H01B3/46)
- H01B 7/02: Disposition of insulation
- H01B 7/0807: {Twin conductor or cable}
- H01B 11/20: Cables having a multiplicity of coaxial lines
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

A twinax cable 100 includes a twinax structure, the twinax structure including: a signal wire pair, the signal wire pair including a pair of signal wires formed of a first signal wire and a second signal wire, and an insulating layer configured to cover the pair of signal wires; a drain wire; and a shield tape arranged on the outer circumferential side of the insulating layer to cover the signal wire pair and the drain wire. The insulating layer is mainly composed of polyethylene. The insulating layer includes not less than 30 ppm and not more than 4000 ppm of a hindered phenol-based antioxidant. A dielectric tangent tan δ of the insulating layer at the time of application of a high-frequency electric field having a frequency of 10 GHz is not more than 3.0×10−4.

## Claims

### Claim at position 1

1: A twinax cable comprising a twinax structure,
the twinax structure including:
a signal wire pair, the signal wire pair including a pair of signal wires formed of a first signal wire and a second signal wire, and an insulating layer configured to cover the pair of signal wires;
a drain wire; and
a shield tape arranged to cover the signal wire pair and the drain wire,
the insulating layer being mainly composed of a polyolefin resin,
the insulating layer including not less than 30 ppm and not more than 4000 ppm of a hindered phenol-based antioxidant,
a dielectric tangent tan δ of the insulating layer at the time of application of a high-frequency electric field having a frequency of 10 GHz being not more than 3.0×10−4.

### Claim at position 2 (depends on 1)

2: The twinax cable according to claim 1, wherein
a skew is not more than 6 ps/m.

### Claim at position 3 (depends on 1)

3: The twinax cable according to claim 1, wherein
a molecular weight distribution Mw/Mn of the polyolefin resin is not less than 6.0.

### Claim at position 4 (depends on 1)

4: The twinax cable according to claim 1, wherein
the polyolefin resin is any one of low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene.

### Claim at position 5 (depends on 1)

5: The twinax cable according to claim 1, wherein
the polyolefin resin is electron-beam-crosslinked.

### Claim at position 6 (depends on 1)

6: The twinax cable according to claim 1, wherein
a cross section perpendicular to a longitudinal direction is symmetric with respect to a perpendicular bisector line of a line segment connecting a center of gravity C1 of the first signal wire and a center of gravity C2 of the second signal wire.

### Claim at position 7 (depends on 1)

7: A multi-core cable comprising:
at least one twinax cable as recited in claim 1; and
a hollow cylindrical sheath arranged to contain the twinax cable.