Electronic circuit and electronic module

Patent metadata

Field	Value
Publication number	US-9071225-B2
Application number	US-201213485688-A
Country	US
Kind code	B2
Filing date	May 31, 2012
Priority date	Jun 1, 2011
Publication date	Jun 30, 2015
Grant date	Jun 30, 2015

Abstract

An electronic circuit includes a plurality of duplexers that are coupled to an antenna terminal and have a pass band different from each other and a plurality of acoustic wave filters that are respectively coupled between the antenna terminal and the plurality of the duplexers, wherein filter characteristics of a first acoustic wave filter of the plurality of the acoustic wave filters are set so as to allow passage of a signal in both a pass band for transmitting and a pass band for receiving of a first duplexer of the plurality of the duplexers that is coupled to the first acoustic wave filter and suppress passage of a signal in both a pass band for transmitting and a pass band for receiving of a second duplexer of the plurality of the duplexers that is different from the first duplexer.

First claim

What is claimed is:

1. An electronic circuit comprising:
a plurality of duplexers that are coupled to an antenna terminal and have a pass band different from each other; and
a plurality of acoustic wave filters that are respectively coupled between the antenna terminal and the plurality of the duplexers, the plurality of acoustic wave filters including a first acoustic wave filter and a second acoustic wave filter,
wherein filter characteristics of the first acoustic wave filter of the plurality of the acoustic wave filters are set so as to allow passage of a signal in both a pass band for transmitting and a pass band for receiving of a first duplexer of the plurality of the duplexers that is coupled to the first acoustic wave filter and suppress passage of a signal in both a pass band for transmitting and a pass band for receiving of a second duplexer of the plurality of the duplexers that is different from the first duplexer and that is coupled to the second acoustic wave filter;
each of the first acoustic wave filter and the second acoustic wave filter is a band pass filter; and
a frequency band included in a pass band of the first acoustic wave filter and a frequency band included in a pass band of the second acoustic wave filter are used for Carrier Aggregation.

2. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a double mode filter.

3. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a filter using a bulk wave.

4. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a CRF (Coupled Resonator Filter) having a piezoelectric thin film.

5. The electronic circuit as claimed in claim 4 , wherein the piezoelectric thin film is aluminum nitride including an element increasing piezoelectric constant.

6. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter uses a plate wave.

7. An electronic module comprising an electronic circuit that includes:
a plurality of duplexers that are coupled to an antenna terminal and have a pass band different from each other; and
a plurality of acoustic wave filters that are respectively coupled between the antenna terminal and the plurality of the duplexers, the plurality of acoustic wave filters including a first acoustic wave filter and a second acoustic wave filter,
wherein:
filter characteristics of the first acoustic wave filter of the plurality of the acoustic wave filters are set so as to allow passage of a signal in both a pass band for transmitting and a pass band for receiving of a first duplexer of the plurality of the duplexers that is coupled to the first acoustic wave filter and suppress passage of a signal in both a pass band for transmitting and a pass band for receiving of a second duplexer of the plurality of the duplexers that is different from the first duplexer and that is coupled to the second acoustic wave filter; and
each of the first acoustic wave filter and the second acoustic wave filter is a band pass filter.

8. The electronic module as claimed in claim 7 , wherein a frequency band included in a pass band of the first acoustic wave filter and a frequency band included in a pass band of the second acoustic wave filter are used for Carrier Aggregation.

9. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a double mode filter.

10. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a filter using a bulk wave.

11. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a CRF (Coupled Resonator Filter) having a piezoelectric thin film.

12. The electronic module as claimed in claim 11 , wherein the piezoelectric thin film is aluminum nitride including an element increasing piezoelectric constant.

13. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter uses a plate wave.

Assignees

• Nishihara Tokihiro
• Taniguchi Shinji
• Yokoyama Tsuyoshi
• Ueda Masanori
• Taiyo Yuden Kk

Inventors

• Nishihara Tokihiro
• Taniguchi Shinji
• Yokoyama Tsuyoshi
• Ueda Masanori

Classifications

• H03H9/173 Primary

  Air-gaps · CPC title

• H03H9/706

  Duplexers · CPC title

• H03H9/542

  including passive elements (H03H9/545 takes precedence) · CPC title

• H03H9/205

  having multiple resonators (crystal tuning forks H03H9/21) · CPC title

• H03H9/725

  Duplexers · CPC title