Signal transmission line including a signal conductor and reinforcing conductor portions parallel to the signal conductor

Patent metadata

Field	Value
Publication number	US-10673114-B2
Application number	US-201816022761-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jan 27, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A signal transmission line includes a laminate, a signal conductor, a hollow portion, and a reinforcing conductor. The laminate includes a flexible laminate including resin layers each of which has flexibility. The signal conductor extends in a signal transmission direction of the laminate and is disposed in an intermediate position in a laminating direction of the resin layers. The hollow portion is in the laminate and defined by an opening provided at a portion of the plurality of resin layers. The reinforcing conductor is in the laminate. The hollow portion is disposed at a position overlapping with the signal conductor, in a plan view of the laminate from a surface perpendicular or substantially perpendicular to the laminating direction. The reinforcing conductor is disposed at a position different from the position of the hollow portion in a plan view.

First claim

What is claimed is:

1. A signal transmission line comprising:
a laminate including a plurality of resin layers each of which has flexibility, the plurality of resin layers being laminated, the laminate having flexibility;
a signal conductor extending in a signal transmission direction of the laminate and being provided in an intermediate position in a laminating direction in which the plurality of resin layers in the laminate are laminated to one another;
a hollow portion provided in the laminate and defined by an opening provided at a portion of the plurality of resin layers; and
a reinforcing conductor provided in the laminate, wherein
the hollow portion is disposed at a position that overlaps with the signal conductor, in a plan view of the laminate from a surface perpendicular or substantially perpendicular to the laminating direction;
the reinforcing conductor is disposed at a position different from the position of the hollow portion in the plan view; and
the reinforcing conductor includes only conductor portions extending in a direction that is parallel or substantially parallel to the signal transmission direction in which the signal conductor extends.

2. The signal transmission line according to claim 1 , further comprising a ground conductor that faces the signal conductor across the hollow portion in the laminating direction.

3. The signal transmission line according to claim 1 , wherein
the reinforcing conductor includes a plurality of reinforcing conductors; and
the plurality of reinforcing conductors are disposed in the laminating direction.

4. The signal transmission line according to claim 3 , wherein the plurality of reinforcing conductors disposed in the laminating direction are connected to each other through an interlayer connection conductor in the laminating direction.

5. The signal transmission line according to claim 1 , wherein
the reinforcing conductor includes a plurality of reinforcing conductors; and
the plurality of reinforcing conductors are disposed at intervals in the signal transmission direction.

6. The signal transmission line according to claim 5 , wherein the plurality of reinforcing conductors are disposed in the laminating direction, and are connected to each other through an interlayer connection conductor in the laminating direction.

7. The signal transmission line according to claim 1 , wherein the hollow portion includes an insulating member provided at the position that overlaps with the signal conductor in the plan view, the insulating member having a height dimension extending in the laminating direction.

8. The signal transmission line according to claim 1 , wherein a thickness of a portion that does not overlap with the hollow portion in a resin layer on which the signal conductor is provided is smaller than a thickness of a portion that overlaps with the hollow portion.

9. The signal transmission line according to claim 1 , wherein the hollow portion is filled with an inert gas.

10. The signal transmission line according to claim 1 , wherein the hollow portion is exposed to outside of the signal transmission line through a vent hole provided in the laminate.

11. The signal transmission line according to claim 10 , wherein
the signal conductor is exposed to the hollow portion; and
the signal conductor includes a protective film provided on a surface of the signal conductor exposed to the hollow portion, the protective film reducing oxidation of the signal conductor.

12. The signal transmission line according to claim 1 , wherein
the laminate includes a portion that includes the hollow portion and a portion that does not include the hollow portion in the signal transmission direction; and
the portion that does not include the hollow portion is a bent portion.

13. The signal transmission line according to claim 12 , wherein the bent portion is thinner than the portion that includes the hollow portion in the laminate.

14. The signal transmission line according to claim 1 , wherein
the signal conductor includes a plurality of signal conductors;
the plurality of signal conductors are disposed in a width direction perpendicular or substantially perpendicular to the laminating direction in the laminate;
the laminate includes an intermediate holding portion that does not include the hollow portion between the plurality of signal conductors, in the width direction; and
the intermediate holding portion includes the reinforcing conductor.

15. The signal transmission line according to claim 14 , wherein the reinforcing conductor provided in the intermediate holding portion is grounded.

16. The signal transmission line according to claim 1 , wherein the plurality of resin layers have thermoplasticity.

17. The signal transmission line according to claim 1 , wherein
the reinforcing conductor includes a plurality of reinforcing conductors; and
at least one of the plurality of reinforcing conductors and the signal conductor are disposed on a same resin layer of the plurality of resin layers.

18. The signal transmission line according to claim 1 , wherein
the reinforcing conductor includes a plurality of reinforcing conductors; and
at least two of the plurality of reinforcing conductors and the signal conductor are disposed on a same resin layer of the plurality of resin layers such that the signal conductor is sandwiched between the at least two reinforcing conductors in a direction perpendicular to the signal transmission direction.

Assignees

• Murata Manufacturing Co

Inventors

• Iida Kanto
• Ikemoto Nobuo

Classifications

• H01P3/081

  Microstriplines · CPC title

• H01P3/08

  Microstrips; Strip lines · CPC title

• H01P3/085

  Triplate lines · CPC title

• H01P3/082 Primary

  Multilayer dielectric · CPC title

• H01P3/087

  Suspended triplate lines · CPC title