Radio frequency module and communication device

Patent metadata

Field	Value
Publication number	US-11777534-B2
Application number	US-202117396909-A
Country	US
Kind code	B2
Filing date	Aug 9, 2021
Priority date	Jul 3, 2019
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A radio frequency module (1) includes a first switch (4), an attenuation filter (3), and a plurality of band pass filters (12A to 12C, 22A to 22C). The first switch (4) is a switch that is capable of simultaneously connecting a common terminal (40) to selection terminals (41, 42) out of a plurality of selection terminals (41 to 43). The plurality of band pass filters (12A to 12C, 22A to 22C) include a first band pass filter (22A) and a second band pass filter (22B). The attenuation filter (3) includes at least one reactive element out of an inductive element and a capacitive element. In the radio frequency module (1), the reactive element is adjacent to at least one band pass filter out of the plurality of band pass filters (12A to 12C, 22A to 22C).

First claim

The invention claimed is:

1. A radio frequency module comprising:
a mounting board;
a switch mounted on the mounting board and having a common terminal connected to an antenna terminal and a plurality of selection terminals configured to be connected to the common terminal, the switch being configured to simultaneously connect the common terminal to at least a first selection terminal and a second selection terminal out of the plurality of selection terminals;
an attenuation filter mounted on the mounting board and connected between the common terminal and the antenna terminal; and
a plurality of band pass filters mounted on the mounting board and connected to the plurality of selection terminals,
wherein:
the plurality of band pass filters comprises:
a first band pass filter connected to the first selection terminal and having a pass band in a first frequency band and
a second band pass filter connected to the second selection terminal and having a pass band in a second frequency band, which is higher than the first frequency band,
the attenuation filter is a low pass filter or a notch filter including at least one reactive element out of an inductive element and a capacitive element, and
the reactive element is adjacent to at least one band pass filter out of the plurality of band pass filters when the mounting board is viewed in a plan view.

2. The radio frequency module according to claim 1 , wherein
the attenuation filter comprises one chip including the reactive element, and
the attenuation filter is adjacent to the at least one band pass filter when the mounting board is viewed in a plan view.

3. The radio frequency module according to claim 2 , wherein
the attenuation filter attenuates a harmonic wave component of a reception signal received through the antenna terminal.

4. A communication device comprising:
the radio frequency module according to claim 2 ; and
a signal processing circuit that processes a reception signal received through the antenna terminal.

5. The radio frequency module according to claim 1 , wherein
the attenuation filter attenuates a harmonic wave component of a reception signal received through the antenna terminal.

6. The radio frequency module according to claim 1 , wherein the plurality of band pass filters further comprises a first transmission filter, a second transmission filter, a first reception filter, and a second reception filter.

7. The radio frequency module according to claim 6 , wherein the first band pass filter is the first reception filter and the second band pass filter is the second reception filter.

8. The radio frequency module according to claim 6 , wherein the first transmission filter and the first reception filter are integrated on one chip.

9. The radio frequency module according to claim 6 , wherein the second transmission filter and the second reception filter are integrated on one chip.

10. The radio frequency module according to claim 6 , wherein the first selection terminal is connected to a connection point connecting an output terminal of the first transmission filter to an input terminal of the first reception filter.

11. The radio frequency module according to claim 6 , wherein the second selection terminal is connected to a connection point connecting an output terminal of the second transmission filter to an input terminal of the second reception filter.

12. The radio frequency module according to claim 6 , further comprising a power amplifier, a low noise amplifier, an output matching circuit, and an input matching circuit.

13. The radio frequency module according to claim 12 , further comprising a second switch having a common terminal and a plurality of selection terminals.

14. The radio frequency module according to claim 13 , wherein the common terminal is connected to an output terminal of the power amplifier with the output matching circuit interposed therebetween.

15. The radio frequency module according to claim 13 , wherein a first selection terminal of the plurality of selection terminals is connected to an input terminal of the first transmission filter and a second selection terminal of the plurality of selection terminals is connected to an input terminal of the second transmission filter.

16. A communication device comprising:
the radio frequency module according to claim 1 ; and
a signal processing circuit that processes a reception signal received through the antenna terminal.

17. The communication device according to claim 16 , wherein the signal processing circuit controls the switch.

18. A radio frequency module comprising:
a mounting board;
a switch mounted on the mounting board and having a common terminal connected to an antenna terminal and a plurality of selection terminals configured to be connected to the common terminal, the switch being configured to simultaneously connect the common terminal to at least a first selection terminal and a second selection terminal out of the plurality of selection terminals;
an attenuation filter mounted on the mounting board and connected between the common terminal and the antenna terminal;
a plurality of band pass filters mounted on the mounting board and connected to the plurality of selection terminals; and
a plurality of inductors connected to the plurality of band pass filters between the plurality of band pass filters and the switch,
wherein:
the plurality of band pass filters comprises:
a first band pass filter connected to the first selection terminal and having a pass band in a first frequency band and
a second band pass filter connected to the second selection terminal and having a pass band in a second frequency band, which is higher than the first frequency band,
the attenuation filter is a low pass filter or a notch filter including at least one reactive element out of an inductive element and a capacitive element, and
the reactive element is adjacent to at least one inductor out of the plurality of inductors when the mounting board is viewed in a plan view.

19. The radio frequency module according to claim 18 , wherein
the attenuation filter attenuates a harmonic wave component of a reception signal received through the antenna terminal.

20. A communication device comprising:
the radio frequency module according to claim 18 ; and
a signal processing circuit that processes a reception signal received through the antenna terminal.

Assignees

• Murata Manufacturing Co

Inventors

• Ikegami Katsuya

Classifications

• H04B1/005 Primary

  adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges · CPC title

• H03H7/0115

  comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) · CPC title

• H03H7/1758

  Series LC in shunt or branch path (H03H7/1791 takes precedence) · CPC title

• H03H7/1766

  Parallel LC in series path (H03H7/1783 takes precedence) · CPC title

• H05K1/181

  associated with surface mounted components · CPC title