High-frequency module

Patent metadata

Field	Value
Publication number	US-11088720-B2
Application number	US-201816215777-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 20, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A high-frequency module includes a transmission signal amplifier that outputs a transmission signal to an antenna terminal side; a reception signal amplifier that amplifies a reception signal supplied from an antenna terminal; a switch that selectively connects the antenna terminal to either an output of the transmission signal amplifier or an input of the reception signal amplifier; and a directional coupler that is provided on a transmission signal path and detects a signal level of the transmission signal. The transmission signal amplifier is controlled by a first control signal supplied from a first control circuit. The reception signal amplifier is controlled by a second control signal supplied from a second control circuit. The switch is controlled by a switch control signal supplied from the first control circuit. The directional coupler is controlled by a coupler control signal supplied from the first control circuit.

First claim

What is claimed is:

1. A high-frequency module comprising:
a transmission signal amplifier configured to amplify a radio frequency signal and output a transmission signal to an antenna terminal;
a reception signal amplifier configured to amplify a reception signal supplied from the antenna terminal;
a switch circuit configured to selectively connect the antenna terminal to an output of the transmission signal amplifier and an input of the reception signal amplifier;
a directional coupler provided on a transmission signal path between the transmission signal amplifier and the antenna terminal, the directional coupler being configured to detect a signal level of the transmission signal;
a first control circuit configured to control:
the transmission signal amplifier by a first control signal,
the switch circuit by a switch control signal, and
the directional coupler by a coupler control signal; and

a second control circuit configured to control the reception signal amplifier by a second control signal,
wherein the switch circuit is connected directly to the input of the reception signal amplifier.

2. The high-frequency module according to claim 1 , wherein the directional coupler is connected between the antenna terminal and the switch circuit.

3. The high-frequency module according to claim 2 , wherein the switch circuit comprises a plurality of switches.

4. The high-frequency module according to claim 2 , wherein the switch circuit includes only a single switch.

5. The high-frequency module according to claim 2 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.

6. The high-frequency module according to claim 1 , wherein the switch circuit is connected between the antenna terminal and the directional coupler.

7. The high-frequency module according to claim 6 , wherein the switch circuit comprises a plurality of switches.

8. The high-frequency module according to claim 6 , wherein the switch circuit includes only a single switch.

9. The high-frequency module according to claim 6 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.

10. The high-frequency module according to claim 1 , wherein the switch circuit comprises a plurality of switches.

11. The high-frequency module according to claim 10 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.

12. The high-frequency module according to claim 1 , wherein the switch circuit includes only a single switch.

13. The high-frequency module according to claim 12 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.

14. The high-frequency module according to claim 1 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.

15. The high-frequency module according to claim 1 , further comprising:
a band pass filter provided on the transmission signal path, or a reception signal path between the reception signal amplifier and the antenna terminal,
wherein the band pass filter is configured to attenuate frequencies outside a frequency band of the transmission signal when the band pass filter is provided on the transmission signal path, and
wherein the band pass filter is configured to attenuate frequencies outside a frequency band of the reception signal when the band pass filter is provided on the reception signal path.

16. The high-frequency module according to claim 1 , further comprising:
a first band pass filter provided on the transmission signal path and configured to attenuate frequencies outside a frequency band of the transmission signal; and
a second band pass filter provided on a reception signal path between the reception signal amplifier and the antenna terminal, and configured to attenuate frequencies outside a frequency band of the reception signal.

17. The high-frequency module according to claim 16 , wherein the first band pass filter and the second band pass filter are configured as a duplexer.

18. The high-frequency module according to claim 1 , further comprising:
a terminal configured to connect the high-frequency module to an external band pass filter,
wherein the external band pass filter is configured to attenuate frequencies outside a frequency band of the transmission signal or the reception signal.

19. The high-frequency module according to claim 1 , further comprising:
a second switch circuit, wherein the transmission signal amplifier is connected between the second switch circuit and the antenna terminal.

20. The high-frequency module according to claim 1 , further comprising:
a third switch circuit, wherein the reception signal amplifier is connected between the third switch circuit and the antenna terminal.

21. The high-frequency module according to claim 1 , wherein the first control signal, the switch control signal, and the coupler control signal are synchronized with one another.

Assignees

• Murata Manufacturing Co

Inventors

• Sakurai Satoshi
• Arayashiki Satoshi
• Tanaka Satoshi
• Hirayama Kyoichi
• Ito Tomohito
• Kurahashi Kenta

Classifications

• H04B1/48 Primary

  in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter {(H04B1/46 takes precedence)} · CPC title

• H04B1/0057

  using diplexing or multiplexing filters for selecting the desired band · CPC title