Transmission line and flat cable

Patent metadata

Field	Value
Publication number	US-2017194076-A1
Application number	US-201715465633-A
Country	US
Kind code	A1
Filing date	Mar 22, 2017
Priority date	Oct 10, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

A transmission line includes, in a stacked insulator in which insulator layers are stacked, a first transmission line portion including a first ground conductor pattern, a second ground conductor pattern, and a first signal conductor pattern, and a second transmission line portion including a third ground conductor pattern, a fourth ground conductor pattern, and a second signal conductor pattern. The first signal conductor pattern extends along the second signal conductor pattern. The first ground conductor pattern and the third ground conductor pattern are provided on different insulator layers and at least partially overlap each other in a plan view.

First claim

What is claimed is:

1 . A transmission line comprising:
a stacked insulator in which a plurality of insulator layers are stacked; and a conductor pattern arranged along at least one of the plurality of insulator layers in the stacked insulator; wherein the conductor pattern includes:
a first transmission line portion including:
a first ground conductor pattern;
a second ground conductor pattern; and
a first signal conductor pattern, and

a second transmission line portion including
a third ground conductor pattern;
a fourth ground conductor pattern; and
a second signal conductor pattern;

the first signal conductor pattern extends along the second signal conductor pattern; each of the first ground conductor pattern, the second ground conductor pattern, the third ground conductor pattern, and the fourth ground conductor pattern includes a width that is larger than a width of each of the first signal conductor pattern and the second signal conductor pattern; the first ground conductor pattern and the second ground conductor pattern are respectively located on one side and another side of the first signal conductor pattern in a stacking direction of the plurality of insulator layers; the first signal conductor pattern, in a plan view, overlaps the first ground conductor pattern and the second ground conductor pattern and does not overlap at least one of the third ground conductor pattern and the fourth ground conductor pattern; the third ground conductor pattern and the fourth ground conductor pattern are respectively located on one side and another side of the second signal conductor pattern in the stacking direction of the plurality of insulator layers; the second signal conductor pattern, in a plan view, overlaps the third ground conductor pattern and the fourth ground conductor pattern and does not overlap at least one of the first ground conductor pattern and the second ground conductor pattern; and at least the first ground conductor pattern and the third ground conductor pattern are provided on different insulator layers among the plurality of insulator layers and at least partially overlap each other in a plan view.

2 . The transmission line according to claim 1 , wherein:
the second ground conductor pattern and the fourth ground conductor pattern are provided on different insulator layers among the plurality of insulator layers and at least partially overlap each other in a plan view; the first ground conductor pattern and the second ground conductor pattern extend in a direction in which the first signal conductor pattern extends; and the third ground conductor pattern and the fourth ground conductor pattern extend in a direction in which the second signal conductor pattern extends.

3 . The transmission line according to claim 2 , wherein:
the first ground conductor pattern, the second ground conductor pattern, and the first signal conductor pattern that define the first transmission line portion are each offset in the stacking direction of the plurality of insulator layers with respect to the third ground conductor pattern, the fourth ground conductor pattern, and the second signal conductor pattern that define the second transmission line portion.

4 . The transmission line according to claim 1 , wherein:
a distance between the third ground conductor pattern and the fourth ground conductor pattern in the stacking direction of the plurality of insulator layers is larger than a distance between the first ground conductor pattern and the second ground conductor pattern in the stacking direction of the plurality of insulator layers; and a line width of the second signal conductor pattern is larger than a line width of the first signal conductor pattern.

5 . The transmission line according to claim 1 , wherein the first signal conductor pattern and the second signal conductor pattern are provided on different insulator layers among the plurality of insulator layers.

6 . A flat cable comprising:
a transmission line; and at least one connector electrically connected to the transmission line; wherein the transmission line is the transmission line according to claim 1 ; and the at least one connector is mounted on the stacked insulator of the transmission line.

7 . The flat cable according to claim 6 , wherein the at least one connector is a coaxial connector.

8 . The flat cable according to claim 6 , wherein the at least one connector includes four connectors that are provided at both ends of each of the first and second transmission line portions.

9 . The flat cable according to claim 6 , wherein the plurality of insulator layers include thereon an internal conductor pattern and an external conductor pattern to mount the at least one connector.

10 . The flat cable according to claim 9 , wherein
the internal conductor pattern includes a plurality of internal conductors; the external conductor pattern includes a plurality of external conductors; the plurality of internal conductor patterns are electrically connected by a first via conductor; and the plurality of external conductor patterns are electrically connected by a second via conductor.

11 . The flat cable according to claim 10 , wherein
the second via conductor includes a third via conductor and a fourth via conductor; the first ground conductor pattern and a common ground conductor pattern are electrically connected to each other by the third via conductor; and the third ground conductor pattern and the common ground conductor pattern are electrically connected to each other by the fourth via conductor.

12 . The transmission line according to claim 1 , further comprising a common ground conductor pattern.

13 . The transmission line according to claim 12 , wherein the first signal conductor pattern is between the first ground conductor pattern and the common ground conductor pattern in the stacking direction of the plurality of insulator layers.

14 . The transmission line according to claim 12 , wherein the second signal conductor pattern is between the third ground conductor pattern and the common ground conductor pattern in the stacking direction of the plurality of insulator layers.

15 . The transmission line according to claim 12 , wherein the common ground conductor pattern includes at least one conductor opening portion.

16 . The transmission line according to claim 15 , wherein the at least one conductor opening portion includes a plurality of conductor opening portions that define a ladder shape or a mesh shape.

17 . The transmission line according to claim 1 , wherein the first signal conductor pattern and the second signal conductor pattern are provided on a same insulator layer among the plurality of insulator layers.

18 . The transmission line according to claim 17 , wherein the second ground conductor pattern and the fourth ground conductor pattern are provided on different insulator layers among the plurality of insulator layers and at least partially overlap each other in a plan view.

19 . The transmission line according to claim 1 , wherein the first transmission line portion and the second transmission line portion are entirely offset from each other in the stacking direction of the plurality of insulator layers.

20 . The transmission line according to claim 1 , wherein the conductor pattern includes a third transmission line portion.

Assignees

• Murata Manufacturing Co

Inventors

• Yosui Kuniaki
• Ito Shingo
• Kezuka Shuichi
• Baba Takahiro

Classifications

• H01P3/026 Primary

  Coplanar striplines [CPS] · CPC title

• H01B7/08 Primary

  Flat or ribbon cables · CPC title

• H05K1/0225

  Single or multiple openings in a shielding, ground or power plane (H05K1/0227 takes precedence) · CPC title

• H05K2201/10189

  Non-printed connector · CPC title

• H05K2201/052

  Branched · CPC title