Flat cable high-frequency filter, flat cable high-frequency diplexer, and electronic device

Patent metadata

Field	Value
Publication number	US-9570784-B2
Application number	US-201514802059-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Feb 1, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A flat cable high-frequency filter includes a dielectric substrate extending in a transmission direction of a high-frequency signal. The dielectric substrate includes dielectric layers stacked on each other. Elongated conductor patterns are provided on a flat surface of one dielectric layer which faces another dielectric layer. The conductor patterns are as wide as possible in the dielectric substrate in accordance with a desired inductance. A capacitive coupling conductor pattern opposes one conductor pattern by a predetermined area with a dielectric layer therebetween. By using a connecting conductor, the capacitive coupling conductor pattern is connected to the conductor pattern which does not oppose the capacitive coupling conductor pattern.

First claim

What is claimed is:

1. A flat cable high-frequency filter comprising:
a dielectric substrate that includes a flat film and extends in a transmission direction of a high-frequency signal;
a plurality of conductor patterns provided on the dielectric substrate, extending along an extending direction of the dielectric substrate, and separated from each other at a position between two ends of the extending direction of the dielectric substrate; and
a capacitive coupling conductor pattern configured to capacitively couple the plurality of conductor patterns; wherein
the plurality of conductor patterns define inductors, and the capacitive coupling conductor pattern defines a capacitor; and
a width, which is in a direction perpendicular to the transmission direction, of a conductor pattern of the plurality of conductor patterns which opposes the capacitive coupling conductor pattern is the same or substantially the same as a width of a conductor pattern of the plurality of conductor patterns which does not oppose the capacitive coupling conductor pattern.

2. The flat cable high-frequency filter according to claim 1 , wherein the dielectric substrate has a dielectric loss tangent equal to or smaller than about 0.005.

3. The flat cable high-frequency filter according to claim 2 , wherein the dielectric substrate is made of a liquid crystal polymer.

4. The flat cable high-frequency filter according to claim 1 , wherein a conductor pattern connected to a ground potential is not located in the dielectric substrate.

5. The flat cable high-frequency filter according to claim 1 , further comprising a shield conductor pattern that includes a flat film and opposes flat film surfaces of the plurality of conductor patterns which do not define the capacitor with a predetermined distance therebetween.

6. The flat cable high-frequency filter according to claim 5 , wherein the shield conductor pattern opposes each of both surfaces of a conductor pattern so as to sandwich the conductor pattern therebetween.

7. The flat cable high-frequency filter according to claim 1 , wherein a bent portion is located at a position other than a region in which the capacitive coupling conductor pattern is located along the transmission direction of the dielectric substrate.

8. The flat cable high-frequency filter according to claim 1 , wherein the capacitive coupling conductor pattern includes a flat conductor pattern which opposes a certain one of the plurality of conductor patterns with a dielectric layer defining the dielectric substrate therebetween and a flat region of the certain one of the plurality of conductor patterns which opposes the flat conductor pattern.

9. The flat cable high-frequency filter according to claim 1 , wherein the capacitive coupling conductor pattern includes a flat conductor pattern which opposes the plurality of conductor patterns with a dielectric layer defining the dielectric substrate therebetween and flat regions of the plurality of conductor patterns which oppose the flat conductor pattern.

10. The flat cable high-frequency filter according to claim 1 , wherein:
the plurality of conductor patterns are provided on different surfaces with a dielectric layer of the dielectric substrate therebetween; and
the capacitive coupling conductor pattern includes a region in which the plurality of conductor patterns oppose each other with the dielectric layer therebetween.

11. The flat cable high-frequency filter according to claim 1 , wherein the widths of the conductor patterns are the same or substantially the same as a width of the dielectric substrate.

12. The flat cable high-frequency filter according to claim 1 , wherein the capacitive coupling conductor pattern includes interdigital conductors which are integrally located at opposing end portions of the plurality of conductor patterns and which oppose each other by a predetermined distance along the transmission direction.

13. The flat cable high-frequency filter according to claim 1 , wherein:
the conductor pattern includes a first partial conductor pattern and a second partial conductor pattern, one end of the first partial conductor pattern and one end of the second partial conductor pattern being connected to each other;
the first partial conductor pattern is wider than the second partial conductor pattern and is linearly arranged along the transmission direction;
the second partial conductor pattern has a loop shape;
the first partial conductor pattern defines the capacitor; and
the second partial conductor pattern defines the inductor.

14. The flat cable high-frequency filter according to claim 13 , wherein the first partial conductor pattern and the second partial conductor pattern are provided on a plurality of dielectric layers of the dielectric substrate.

15. A flat cable high-frequency diplexer comprising:
a band pass filter configured as the flat cable high-frequency filter according to claim 13 ; and
a band elimination filter defined by another conductor pattern disposed in the dielectric substrate.

16. An electronic device comprising:
the flat cable high-frequency filter according to claim 1 ; and
a plurality of mount circuit members; wherein
the plurality of mount circuit members are connected to each other by the flat cable high-frequency filter.

17. The electronic device according to claim 16 , wherein the flat cable high-frequency filter is disposed with a predetermined gap from each of the plurality of mount circuit members.

18. An electronic device comprising:
the flat cable high-frequency diplexer according to claim 15 ; and
a plurality of mount circuit members; wherein
the plurality of mount circuit members are connected to each other by the flat cable high-frequency diplexer.

19. The electronic device according to claim 18 , wherein the flat cable high-frequency diplexer is disposed with a predetermined gap from each of the plurality of mount circuit members.

Assignees

• Murata Manufacturing Co

Inventors

• Baba Takahiro
• Yoshinaga Yasuko
• Ishino Satoshi
• Sasaki Jun
• Kato Noboru
• Yosui Kuniaki

Classifications

• H01P3/088

  Stacked transmission lines · CPC title

• H01P1/20363

  Linear resonators · CPC title

• H03H1/00

  Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H9/00) · CPC title

• H01P3/085

  Triplate lines · CPC title

• H01P1/20345 Primary

  Multilayer filters · CPC title