Multiplexer

Patent metadata

Field	Value
Publication number	US-10574206-B2
Application number	US-201816015347-A
Country	US
Kind code	B2
Filing date	Jun 22, 2018
Priority date	Dec 28, 2015
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

A multiplexer includes a first filter, a second filter, a combining wiring line that provides a combination point at which an input or an output of each of the first filter and the second filter is connected to each other, an antenna terminal to connect the multiplexer to an antenna, an antenna wiring line connected at one end to the antenna terminal and connected at the other end to the combining wiring line, a matching terminal to which a matching inductor to provide matching between the antenna and the multiplexer is to be connected, and a matching wiring line to be connected at one end to the matching terminal and connected at the other end to the combining wiring line.

First claim

What is claimed is:

1. A multiplexer comprising:
at least two filters;
a combining wiring line that provides a combination point at which an input side or an output side of each of the at least two filters is connected to each other;
an antenna terminal to connect the multiplexer to an antenna;
an antenna wiring line that is connected at one end to the antenna terminal and that is connected at another end to the combining wiring line;
a matching terminal to which a matching device to provide matching between the antenna and the multiplexer is to be connected; and
a matching wiring line to be connected at one end to the matching terminal and connected at another end to the combining wiring line.

2. The multiplexer according to claim 1 , wherein the another end of the antenna wiring line and the another end of the matching wiring line are connected to the combining wiring line at a same or substantially a same position.

3. The multiplexer according to claim 1 , further comprising:
a substrate including the antenna wiring line and the matching wiring line; wherein
the antenna wiring line and the matching wiring line are located on opposite sides of the combining wiring line from each other in a plan view of the substrate.

4. The multiplexer according to claim 3 , wherein the antenna wiring line and the matching wiring line are perpendicular or substantially perpendicular to the combining wiring line in the plan view of the substrate.

5. The multiplexer according to claim 1 , wherein the matching device is connected to the matching terminal.

6. The multiplexer according to claim 5 , wherein
the matching device is an inductor that is connected between the matching terminal and a ground potential; and
the inductor has an inductance that causes an impedance at the antenna terminal to match a predetermined impedance due to a combined inductance of the inductor and the matching wiring line having an inductance that is determined in accordance with an electrical length.

7. The multiplexer according to claim 1 , wherein each of the at least two filters is a duplexer including a transmission filter and a reception filter.

8. The multiplexer according to claim 1 , wherein each of the at least two filters is a piezoelectric chip including a surface acoustic wave filter.

9. The multiplexer according to claim 1 , further comprising:
a package substrate; wherein
the at least two filters are mounted on the package substrate.

10. The multiplexer according to claim 9 , wherein the package substrate is a glass epoxy substrate.

11. The multiplexer according to claim 1 , wherein the multiplexer is sealed with a sealing resin.

12. The multiplexer according to claim 9 , wherein
the package substrate has a rectangular or substantially rectangular shape;
the at least two filters include a first filter and a second filter; and
the first and second filters are arranged in a longitudinal direction on an upper surface of the package substrate.

13. The multiplexer according to claim 1 , wherein the another end of the antenna wiring line and the another end of the matching wiring line are connected to the combining wiring line at different positions.

14. The multiplexer according to claim 1 , further comprising:
a substrate including the antenna wiring line and the matching wiring line; wherein
the antenna wiring line and the matching wiring line are located on a same side of the combining wiring line in a plan view of the substrate.

15. The multiplexer according to claim 14 , wherein the antenna wiring line and the matching wiring line are connected to the combining wiring line at angles that differ from a right angle in the plan view.

16. The multiplexer according to claim 14 , wherein each of the antenna wiring line and the matching wiring line is connected to the combining wiring line at an angle of about 45°.

Assignees

• Murata Manufacturing Co

Inventors

• Eihama Toru

Classifications

• H05K1/185

  associated with components encapsulated in the insulating substrate of the PCBs; associated with components incorporated in internal layers of multilayer circuit boards · CPC title

• H05K2201/1006

  Non-printed filter · CPC title

• H05K1/165

  incorporating printed inductors · CPC title

• H03H9/46

  Filters (multiple-port electromechanical filters H03H9/70) · CPC title

• H03H9/0576

  including surface acoustic wave [SAW] devices · CPC title