Signal transmission cable and communication device module

Patent metadata

Field	Value
Publication number	US-9887446-B2
Application number	US-201514873283-A
Country	US
Kind code	B2
Filing date	Oct 2, 2015
Priority date	May 15, 2013
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

A signal transmission cable including a high-Q value band-elimination filter includes a first signal line conductor pattern including a first capacitor conductor portion and an inductor conductor portion on a first base layer. The first capacitor conductor portion includes a flat conductor, and the inductor conductor portion has a spiral shape. A second signal line conductor pattern including a second capacitor conductor portion is provided on a second base layer. The inductor conductor portion constitutes an inductor, and the first and second capacitor conductor portions and the first base layer constitute a capacitor. The inductor and the capacitor are connected in parallel by transmission conductor portions on the first and second base layers and an interlayer-connector conductor on the first base layer.

First claim

What is claimed is:

1. A signal transmission cable with band-elimination filter functionality, comprising:
a signal transmission line that connects a first external connection terminal and a second external connection terminal;
a flexible flat base body in which the signal transmission line is defined by a conductor pattern; and
a band-elimination filter that is connected between the first external connection terminal and the second external connection terminal by the signal transmission line and includes an inductor and a capacitor provided in or on the flexible flat base body; wherein
the flexible flat base body includes a bent portion between a position of the first external connection terminal and a position of the second external connection terminal.

2. A communication device module comprising:
the signal transmission cable with band-elimination filter functionality according to claim 1 ;
an antenna board connected to the first external connection terminal; and
a front end board connected to the second external connection terminal.

3. A signal transmission cable with band-elimination filter functionality, comprising:
a signal transmission line that connects a first external connection terminal and a second external connection terminal;
a flexible flat base body in which the signal transmission line is defined by a conductor pattern;
a band-elimination filter that is connected between the first external connection terminal and the second external connection terminal by the signal transmission line and includes an inductor and a capacitor provided in or on the flexible flat base body; and
a series resonance inductor; wherein
the flexible flat base body includes a multilayer structure including a stack of a plurality of base layers;
the inductor includes a line conductor pattern on at least one layer of the plurality of base layers;
the inductor and the capacitor are connected in parallel by the conductor pattern; and
the series resonance inductor includes a line conductor pattern on the plurality of base layers and is connected in series to the capacitor.

4. A signal transmission cable with diplexer functionality, comprising:
the signal transmission cable with band-elimination filter functionality according to claim 3 ; and
a bandpass filter including another conductor pattern provided in the flexible flat base body.

5. A communication device module comprising:
the signal transmission cable with diplexer functionality according to claim 4 ; and
an antenna board and a front end board that are connected by the signal transmission cable with diplexer functionality.

6. The signal transmission cable with band-elimination filter functionality according to claim 3 , wherein
the line conductor pattern of the inductor includes a first line conductor pattern;
the line conductor pattern of the series resonance inductor includes a second line conductor pattern;
on each base layer of the plurality of base layers, the first line conductor pattern and the second line conductor pattern are provided;
the first line conductor patterns on respective base layers of the plurality of base layers are connected by a first interlayer-connector conductor;
the second line conductor patterns on respective base layers of the plurality of base layers are connected by a second interlayer-connector conductor; and
each of the second line conductor patterns is divided into a first portion connecting to the first external connection terminal and a second portion connecting to the second external connection terminal, and the first portion of one of the second line conductor patterns on a first base layer of the plurality of base layers is arranged opposite to the second portion of another one of the second line conductor patterns on a second base layer of the plurality of base layers over the first base layer.

7. The signal transmission cable with band-elimination filter functionality according to claim 6 , wherein
the first line conductor patterns and the second line conductor patterns are provided on three or more base layers of the plurality of base layers; and
a plurality of opposing portions of the first portion and the second portion are provided.

8. The signal transmission cable with band-elimination filter functionality according to claim 3 , wherein
the line conductor pattern of the inductor includes first line conductor patterns;
the line conductor pattern of the series resonance inductor includes second line conductor patterns;
the inductor includes a first spiral conductor pattern including the first line conductor patterns and a first interlayer-connector conductor connecting the first line conductor patterns, each of the first line conductor patterns being provided in a respective layer of the plurality of base layers and including a loop-shaped portion that is partially cut off; and
the series resonance inductor includes a second spiral conductor pattern including the second line conductor patterns and a second interlayer-connector conductor connecting the second line conductor patterns, each of the second line conductor patterns being provided on a respective layer of the plurality of base layers that is different from the respective layers on which the inductor is provided and including a loop-shaped portion that is partially cut off.

9. The signal transmission cable with band-elimination filter functionality according to claim 8 , wherein a winding direction of the first spiral conductor pattern is opposite to a winding direction of the second spiral conductor pattern.

10. A communication device module comprising:
the signal transmission cable with band-elimination filter functionality according to claim 3 ;
an antenna board connected to the first external connection terminal; and
a front end board connected to the second external connection terminal.

11. The signal transmission cable with band-elimination filter functionality according to claim 3 , wherein the capacitor includes flat conductor patterns located on the plurality of base layers and opposing to each other in a stacking direction of the multilayer structure.

12. The signal transmission cable with band-elimination filter functionality according to claim 3 , wherein the flexible flat base body includes liquid crystal polymer.

13. The signal transmission cable with band-elimination filter functionality according to claim 3 , wherein the first external connection terminal and the second external connection terminal each include a connector member that establishes an electrical connection with an external circuit by connecting each other mechanically.

14. A signal transmission cable with band-elimination filter functionality, comprising:
a signal transmission line that connects a first external connection terminal and a second external connection terminal;
a flexible flat base body in which the signal transmission line is defined by a conductor pattern; and
a band-elimination filter that is connected between the first external connection terminal and the second external connection terminal by the signal transmission line and includes an inductor and a capacitor provided in or on the flexible flat base body; wherein
the flexible flat base body includes a multilayer structure including a stack of a plurality of base layers;
the inductor includes a line conductor pattern on at least one layer of the plurality of base layers;
the inductor and the capacitor are connected in parallel by the conductor pattern;
the capacitor is a surface mount element; and
the surface mount element is arranged at a location where the signal transmission line i

Assignees

• Murata Manufacturing Co

Inventors

• Yosui Kuniaki

Classifications

• H05K2201/10189

  Non-printed connector · CPC title

• H04B1/38

  Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving · CPC title

• H05K1/0231

  Capacitors or dielectric substances · CPC title

• H05K1/162

  incorporating printed capacitors · CPC title

• H05K1/165

  incorporating printed inductors · CPC title