Twin axial cable with dual extruded dielectric

Patent metadata

Field	Value
Publication number	US-11264149-B2
Application number	US-202017086770-A
Country	US
Kind code	B2
Filing date	Nov 2, 2020
Priority date	Nov 2, 2019
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A twin axial cable includes a pair of wires each with a core conductor; a first dielectric extruded around each of the core conductors, said pair of conductors with the first dielectrics being intimately side by side positioned with each other in a transverse direction; a second dielectric different form the first dielectric and extruded around the first dielectrics; a shielding layer enclosing the second dielectric; and a heat seal PET layer enclosing the shielding layer. A coupling ratio which is calculated by a value of an even mode characteristic impedance subtracted an odd mode characteristic impedance divided by a value of the even mode characteristic impedance pulsed the odd mode characteristic impedance is between 15% to 30%.

First claim

What is claimed is:

1. A twin axial cable comprising:
a pair of wires each with a core conductor;
a first dielectric extruded around each of the core conductors, said pair of conductors with the first dielectrics being intimately side by side positioned with each other in a transverse direction;
a second dielectric being different from the first dielectric and extruded around the first dielectrics with no air gap therebetween;
a shielding layer enclosing the second dielectric; and
a heat seal PET layer enclosing the shielding layer;
wherein a coupling ratio which is calculated by a value of an even mode characteristic impedance subtracted an odd mode characteristic impedance divided by a value of the even mode characteristic impedance plus the odd mode characteristic impedance is between 15% to 30%.

2. The twin axial cable as claimed in claim 1 , wherein the first dielectric has a round cross-section.

3. The twin axial cable as claimed in claim 1 , wherein the second dielectric has a stadium cross-section.

4. The twin axial cable as claimed in claim 1 , wherein the shielding layer is Cu foil enclosing the second dielectric, and there is no drain wire located in twin axial cable.

5. The twin axial cable as claimed in claim 4 , wherein the Cu foil is longitudinally or spirally wrapped.

6. The twin axial cable as claimed in claim 1 , wherein the shielding layer comprises an outer Al foil and an inner Cu foil.

7. The twin axial cable as claimed in claim 6 , wherein the Al foil is longitudinally or spirally wrapped, and the Cu foil is longitudinally or spirally wrapped.

8. The twin axial cable as claimed in claim 1 , wherein one bare drain wire located by one of two sides of the pair of wires or a pair of bare drain wires located by two sides of the pair of wires and tightly sandwiched between the shielding layer and the heat seal PET layer in the transverse direction.

9. The twin axial cable as claimed in claim 1 , wherein the first dielectric is formed by solid insulation, and the second dielectric is formed by foamed insulation.

10. The twin axial cable as claimed in claim 1 , wherein the first dielectric is formed by foamed insulation, and the second dielectric is formed by solid insulation.

11. The twin axial cable as claimed in claim 1 , wherein the first dielectric and the second dielectric are formed by foamed insulations at different foaming ratios.

12. The twin axial cable as claimed in claim 1 , wherein a thickness of the first dielectric is around three-fourths of a diameter of the core conductor.

13. The twin axial cable as claimed in claim 1 , wherein a thickness of the second dielectric on two opposite lateral sides of the pair of wires is around two fifths of a thickness of the first dielectric layer.

14. The twin axial cable as claimed in claim 1 , wherein a transmitting speed of the twin axial cable supports 112 Gbps.

15. A twin axial cable comprising:
a pair of wires side by side arranged with each other in a transverse direction, each of the wires having a core conductor;
a first dielectric extruded around each of the core conductors, said pair of conductors with the first dielectrics being intimately side by side positioned with each other in a transverse direction;
a second dielectric being different from the first dielectric and extruded around the first dielectrics with no air gap therebetween;
a shielding layer enclosing the second dielectric; and
a heat seal PET layer enclosing the shielding layer; wherein
one of the first dielectric and the second dielectric is solid insulation while the other of the first dielectric and the second dielectric is foamed insulation;
wherein a coupling ratio, which is calculated by a value of an even mode characteristic impedance minus an odd mode characteristic impedance and further divided by another value of the even mode characteristic impedance plus the odd mode characteristic impedance, is in a range of 10% to 35%.

16. The twin axial cable as claimed in claim 15 , wherein the first dielectric has a round cross-section.

17. The twin axial cable as claimed in claim 15 , wherein the coupling ratio is in a range of 15% to 35%.

18. The twin axial cable as claimed in claim 15 , wherein the second dielectric has a stadium cross-section having a long dimension along the transverse direction and a short dimension in a vertical direction perpendicular to the transverse direction, and the short dimension is larger than a diameter of the first dielectric in the vertical direction.

19. The twin axial cable as claimed in claim 18 , wherein a ratio among a diameter of the core conductor, the diameter of the first dielectric and the short dimension of the second dielectric, is around 3:8:10.

20. The twin axial cable as claimed in claim 15 , wherein the coupling ratio is in a range of 10% to 30%.

Assignees

• Foxconn Kunshan Computer Connector Co Ltd
• Foxconn Interconnect Technology Ltd

Inventors

• Chen Joe-Fu
• Zheng Jie
• Yang An-Jen

Classifications

• H01B7/0208

  Cables with several layers of insulating material · CPC title

• H01B11/002 Primary

  Pair constructions · CPC title

• H01B7/0838

  Parallel wires, sandwiched between two insulating layers · CPC title

• H01B13/141 Primary

  of two or more insulating layers · CPC title

• H01B13/06

  Insulating conductors or cables (H01B13/32 takes precedence) · CPC title