Filter device having a filter connection conductor line including parallel connected conductor lines

Patent metadata

Field	Value
Publication number	US-9948278-B2
Application number	US-201615190294-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Jan 7, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

In a filter device, a first filter and a second filter are connected to a common connection point by a filter connection conductor line including a first conductor line portion, and a parallel connection area with an electrical length shorter than that in a single conductor line is provided in the first conductor line portion.

First claim

What is claimed is:

1. A filter device comprising:
a substrate;
a first filter including a first terminal and a second terminal and including a first pass band;
a second filter including third and fourth terminals and including a second pass band that is different from the first pass band of the first filter; and
a filter connection conductor line including a fifth terminal and a common connection point connected to the fifth terminal, the common connection point being connected to one of the first and second terminals and one of the third and fourth terminals; wherein
the filter connection conductor line includes a first conductor line portion connected to the common connection point and the first filter and a second conductor line portion connected to the common connection point and the second filter;
the first conductor line portion includes a parallel connection area in which a plurality of conductor lines are connected in parallel to each other so that an electrical length is shorter than in a case in which a single conductor line is provided;
the first filter and the second filter are mounted on the substrate; and
the parallel connection area is provided in the substrate.

2. The filter device according to claim 1 , further comprising a resonator connected to the parallel connection area and the first filter.

3. The filter device according to claim 1 , wherein the parallel connection area does not have a functional element.

4. The filter device according to claim 1 , wherein in the filter connection conductor line, a length of the second conductor line portion connected to the common connection point and the second filter is different from a length of the first conductor line portion.

5. The filter device according to claim 1 , wherein in each conductor line of the plurality of conductor lines from one end to another end of the parallel connection area, a length of at least one of the plurality of conductor lines is different from a length of another one of the plurality of conductor lines.

6. The filter device according to claim 1 , wherein the parallel connection area is located between the common connection point and the first filter.

7. The filter device according to claim 1 , wherein the plurality of conductor lines in the parallel connection area extend alongside each other in a predetermined plane.

8. The filter device according to claim 1 , wherein the plurality of conductor lines in the parallel connection area are distributed among a plurality of planes including different height positions.

9. The filter device according to claim 1 , wherein the filter device is a duplexer.

10. The filter device according to claim 1 , wherein the first filter is a reception filter.

11. The filter device according to claim 1 , wherein the second filter is a transmission filter.

12. The filter device according to claim 1 , wherein the fifth terminal is connected to an antenna.

13. The filter device according to claim 1 , wherein the second filter is one of a ladder filter and a longitudinally coupled resonator type filter.

14. The filter device according to claim 1 , further comprising a serial arm that connects the third terminal to the fourth terminal which is a transmission terminal.

15. The filter device according to claim 14 , further comprising parallel arms that connect the serial arm to a ground potential.

16. A filter device comprising:
a substrate;
a first filter including a first terminal and a second terminal and including a first pass band;
a second filter including third and fourth terminals and including a second pass band that is different from the first pass band of the first filter; and
a filter connection conductor line including a fifth terminal and a common connection point connected to the fifth terminal, the common connection point being connected to one of the first and second terminals and one of the third and fourth terminals; wherein
the filter connection conductor line includes a first conductor line portion connected to the common connection point and the first filter and a second conductor line portion connected to the common connection point and the second filter;
the second conductor line portion includes a parallel connection area in which a plurality of conductor lines are connected in parallel to each other so that an electrical length is shorter than in a case in which a single conductor line is provided;
the first filter and the second filter are mounted on the substrate; and
the parallel connection area is provided in the substrate.

17. The filter device according to claim 16 , wherein the parallel connection area does not have a functional element.

18. The filter device according to claim 16 , wherein in each conductor line of the plurality of conductor lines from one end to another end of the parallel connection area, a length of at least one of the plurality of conductor lines is different from a length of another one of the plurality of conductor lines.

Assignees

• Murata Manufacturing Co

Inventors

• Okuda Tetsuro

Classifications

• H03H9/0085

  having four acoustic tracks · CPC title

• H03H9/706 Primary

  Duplexers · CPC title

• H01P1/201

  Filters for transverse electromagnetic waves (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) · CPC title

• H01P1/184

  Strip line phase-shifters (H01P1/181, H01P1/185, H01P1/19 take precedence) · CPC title

• H03H9/725 Primary

  Duplexers · CPC title