ACOUSTIC WAVE DEVICE AND ANTENNA DUPLEXER EMPLOYING THE SAME

• US 20130099875A1
• Filed: 03/12/2012
• Published: 04/25/2013
• Est. Priority Date: 04/12/2011
• Status: Active Grant

• Current Assignee: Skyworks Filter Solutions Japan Co., Ltd. (Skyworks Solutions Incorporated)
• Original Assignee: SKYWORKS PANASONIC FILTER SOLUTIONS JAPAN CO., LTD
• Inventors: Shimizu, Hidehito, Nakamura, Hiroyuki, Sato, Takahiro
• Granted Patent: US 9,124,240 B2
• Time in Patent Office: Days
• US Class Current: 333/133
• CPC Class Codes: H03H 7/463 Duplexers
• CPC Class Codes: H03H 9/14594 Plan-rotated or plan-tilted transducers
• CPC Class Codes: H03H 9/25 Constructional features of resonators using surface acoustic waves devices for manipulating acoustic surface waves in general G10K11/36
• CPC Class Codes: H03H 9/6483 Ladder SAW filters
• CPC Class Codes: H03H 9/725 Duplexers

Abstract

The present invention is an acoustic wave device including first and second acoustic wave resonators. A first tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the first acoustic wave resonator extend and a direction along which the electrode fingers are arranged is different from a second tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the second acoustic wave resonator extend and a direction along which the electrode fingers are arranged.

Claims

1. An acoustic wave device comprising first and second acoustic wave resonators, wherein

a first tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the first acoustic wave resonator extend and a direction along which the electrode fingers are arranged is made different from a second tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the second acoustic wave resonator extend and a direction along which the electrode fingers are arranged.

2. The acoustic wave device according to claim 1, wherein

the first acoustic wave resonator is a series resonator connected to a series arm,

the second acoustic wave resonator is a parallel resonator connected to a parallel arm,

a power flow angle at a resonant frequency of the first acoustic wave resonator is higher than a power flow angle at an anti-resonant frequency of the second acoustic wave resonator, and

the first tilt angle is higher than the second tilt angle.

3. The acoustic wave device according to claim 1, wherein

the first acoustic wave resonator is a series resonator connected to a series arm,

the second acoustic wave resonator is a parallel resonator connected to a parallel arm,

a power flow angle at a resonant frequency of the first acoustic wave resonator is lower than a power flow angle at an anti-resonant frequency of the second acoustic wave resonator, and

the first tilt angle is lower than the second tilt angle.

4. The acoustic wave device according to claim 1, wherein

the first acoustic wave resonator is a series resonator connected to a series arm, and

the first tilt angle is within a range of ±

1°

from a power flow angle at a resonant frequency of the first acoustic wave resonator.

5. The acoustic wave device according to claim 1, wherein

the second acoustic wave resonator is a parallel resonator connected to a parallel arm, and

the second tilt angle is within a range of ±

1°

from a power flow angle at an anti-resonant frequency of the second acoustic wave resonator.

6. The acoustic wave device according to claim 1, wherein

the first and second acoustic wave resonators are series resonators connected to a series arm,

a power flow angle at a resonant frequency of the first acoustic wave resonator is higher than a power flow angle at a resonant frequency of the second acoustic wave resonator, and

the first tilt angle is higher than the second tilt angle.

7. The acoustic wave device according to claim 1, wherein

the first and second acoustic wave resonators are series resonators connected to a series arm,

an anti-resonant frequency of the first acoustic wave resonator is lower than an anti-resonant frequency of the second acoustic wave resonator, and

the absolute value of a difference between the first tilt angle and a power flow angle of a grating at the anti-resonant frequency of the first acoustic wave resonator is smaller than the absolute value of a difference between the second tilt angle and a power flow angle of a grating at the anti-resonant frequency of the second acoustic wave resonator.

8. The acoustic wave device according to claim 1, wherein

the first and second acoustic wave resonators are parallel resonators connected to a parallel arm,

a power flow angle at an anti-resonant frequency of the first acoustic wave resonator is lower than a power flow angle at an anti-resonant frequency of the second acoustic wave resonator, and

the first tilt angle is lower than the second tilt angle.

9. The acoustic wave device according to claim 1, wherein

the first and second acoustic wave resonators are parallel resonators connected to a parallel arm,

a resonant frequency of the first acoustic wave resonator is higher than a resonant frequency of the second acoustic wave resonator, and

the absolute value of a difference between the first tilt angle and a power flow angle of a grating at the resonant frequency of the first acoustic wave resonator is smaller than the absolute value of a difference between the second tilt angle and a power flow angle of a grating at the resonant frequency of the second acoustic wave resonator.

10. An antenna duplexer comprising a first acoustic wave filter having a first frequency band as a pass band and a second acoustic wave filter having, as a pass band, a second frequency band higher than the first frequency band, wherein

the first acoustic wave filter includes a first acoustic wave resonator connected to a series arm and a second acoustic wave resonator connected to a parallel arm, and

the absolute value of a difference between a power flow angle at an anti-resonant frequency of the first acoustic wave resonator and a first tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the first acoustic wave resonator extend and a direction along which the electrode fingers are arranged is smaller than the absolute value of a difference between a power flow angle at a resonant frequency of the second acoustic wave resonator and a second tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the second acoustic wave resonator extend and a direction along which the electrode fingers are arranged.

11. An antenna duplexer comprising a first acoustic wave filter having a first frequency band as a pass band and a second acoustic wave filter having, as a pass band, a second frequency band higher than the first frequency band, wherein

the second acoustic wave filter includes a first acoustic wave resonator connected to a series arm and a second acoustic wave resonator connected to a parallel arm, and

the absolute value of a difference between a power flow angle at a resonant frequency of the second acoustic wave resonator and a first tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the second acoustic wave resonator extend and a direction along which the electrode fingers are arranged is smaller than the absolute value of a difference between a power flow angle at an anti-resonant frequency of the first acoustic wave resonator and a second tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the first acoustic wave resonator extend and a direction along which the electrode fingers are arranged.

12. An antenna duplexer comprising a first acoustic wave filter having a first frequency band as a pass band and a second acoustic wave filter having, as a pass band, a second frequency band higher than the first frequency band, wherein

the first acoustic wave filter is a reception filter which receives a signal, and includes a plurality of first acoustic wave resonators connected to a series arm and a second acoustic wave resonator connected to a parallel arm, and

the absolute value of a difference between a power flow angle at a resonant frequency of a series resonator at an input-side first stage among the first series resonators and a first tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the series resonator at the input-side first stage extend and a direction along which the electrode fingers are arranged is smaller than the absolute value of a difference between a power flow angle at a resonant frequency of any one series resonator at a stage other than the input-side first stage among the first series resonators and a second tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of said any one series resonator at the stage other than the input-side first stage extend and a direction along which the electrode fingers are arranged.

13. An antenna duplexer comprising a first acoustic wave filter having a first frequency band as a pass band and a second acoustic wave filter having, as a pass band, a second frequency band higher than the first frequency band, wherein

the second acoustic wave filter is a reception filter which receives a signal, and includes a plurality of first acoustic wave resonators connected to a series arm and a second acoustic wave resonator connected to a parallel arm, and

the absolute value of a difference between a power flow angle at a resonant frequency of a series resonator at an input-side first stage among the first series resonators and a first tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of the series resonator at the input-side first stage extend and a direction along which the electrode fingers are arranged is smaller than the absolute value of a difference between a power flow angle at a resonant frequency of any one series resonator at a stage other than the input-side first stage among the first series resonators and a second tilt angle that is an angle formed between a direction perpendicular to a direction in which electrode fingers of said any one series resonator at the stage other than the input-side first stage extend and a direction along which the electrode fingers are arranged.