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US 9,124,240 B2Granted
Acoustic wave device and antenna duplexer employing the same
AssigneeSkyworks Panasonic Filter Solutions Japan Co., Ltd.
InventorsHidehito Shimizu, Hiroyuki Nakamura, Takahiro Sato
Life of this patent
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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.
Claims20
An acoustic wave device comprising:
- a first acoustic wave resonator, the first acoustic wave resonator being a series resonator connected to a series arm of the acoustic wave device and including a first plurality of electrode fingers, the first acoustic wave resonator having a first tilt angle that is an angle formed between a direction perpendicular to a direction in which the first plurality of electrode fingers of the first acoustic wave resonator extend and a direction along which the first plurality of electrode fingers are arranged, the first tilt angle being within a range of ±1° from a power flow angle at a resonant frequency of the first acoustic wave resonator;
- and
- a second acoustic wave resonator including a second plurality of electrode fingers and having a second tilt angle that is an angle formed between a direction perpendicular to a direction in which the second plurality of electrode fingers of the second acoustic wave resonator extend and a direction along which the second plurality of electrode fingers are arranged, the second tilt angle being different from the first tilt angle.
An acoustic wave device comprising:
- a first acoustic wave resonator including a first plurality of electrode fingers and having a first tilt angle that is an angle formed between a direction perpendicular to a direction in which the first plurality of electrode fingers extend and a direction along which the first plurality of electrode fingers are arranged, the first acoustic wave resonator being a parallel resonator connected to a parallel arm of the acoustic wave device;
- and
- a second acoustic wave resonator including a second plurality of electrode fingers and having a second tilt angle that is an angle formed between a direction perpendicular to a direction in which the second plurality of electrode fingers extend and a direction along which the second plurality of electrode fingers are arranged, the second tilt angle being different from the first tilt angle, a resonant frequency of the first acoustic wave resonator being higher than a resonant frequency of the second acoustic wave resonator, and an absolute value of a difference between the first tilt angle and a power flow angle at the resonant frequency of the first acoustic wave resonator being smaller than an absolute value of a difference between the second tilt angle and a power flow angle at the resonant frequency of the second acoustic wave resonator.
An antenna duplexer comprising:
- a first acoustic wave filter having a first frequency band as a pass band, the first acoustic wave filter including a first acoustic wave resonator connected to a series arm of the first acoustic wave filter and a second acoustic wave resonator connected to a parallel arm of the first acoustic wave filter;
- and
- a second acoustic wave filter having, as a pass band, a second frequency band higher than the first frequency band,
- an 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 being smaller than an 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.
1 more element
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, the first acoustic wave filter being a reception filter which receives a signal, and including a plurality of first acoustic wave series resonators connected to a series arm of the first acoustic wave filter and a second acoustic wave resonator connected to a parallel arm of the first acoustic wave filter, and an 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 plurality of 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 being smaller than an 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 plurality of 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.
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, the second acoustic wave filter being a reception filter which receives a signal, and including a plurality of first acoustic wave series resonators connected to a series arm of the second acoustic wave filter and a second acoustic wave resonator connected to a parallel arm of the second acoustic wave filter, and an 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 plurality of 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 being smaller than an 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 plurality of 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.
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, the second acoustic wave filter including a first acoustic wave resonator connected to a series arm of the second acoustic wave filter and a second acoustic wave resonator connected to a parallel arm of the second acoustic wave filter, and an 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 being smaller than an 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.
An acoustic wave device comprising:
- a first acoustic wave resonator including a first plurality of electrode fingers and having a first tilt angle that is an angle formed between a direction perpendicular to a direction in which the first plurality of electrode fingers extend and a direction along which the first plurality of electrode fingers are arranged;
- and
- a second acoustic wave resonator including a second plurality of electrode fingers and having a second tilt angle that is an angle formed between a direction perpendicular to a direction in which the second plurality of electrode fingers of the second acoustic wave resonator extend and a direction along which the second electrode fingers are arranged, the second acoustic wave resonator being a parallel resonator connected to a parallel arm of the acoustic wave device, and the second tilt angle being different from the first tilt angle and within a range of ±1° from a power flow angle at an anti-resonant frequency of the second acoustic wave resonator.
An acoustic wave device comprising:
- a first acoustic wave resonator including a first plurality of electrode fingers and having a first tilt angle that is an angle formed between a direction perpendicular to a direction in which the first plurality of electrode fingers extend and a direction along which the first plurality of electrode fingers are arranged, the first acoustic wave resonator being a series resonator connected to a series arm of the acoustic wave device;
- and
- a second acoustic wave resonator including a second plurality of electrode fingers and having a second tilt angle that is an angle formed between a direction perpendicular to a direction in which the second plurality of electrode fingers extend and a direction along which the second plurality of electrode fingers are arranged, the second tilt angle being different from the first tilt angle, the second acoustic wave resonator being a series resonator connected to the series arm, an anti-resonant frequency of the first acoustic wave resonator being lower than an anti-resonant frequency of the second acoustic wave resonator, and an absolute value of a difference between the first tilt angle and a power flow angle at the anti-resonant frequency of the first acoustic wave resonator being smaller than an absolute value of a difference between the second tilt angle and a power flow angle at the anti-resonant frequency of the second acoustic wave resonator.
Dependencies are inferred from the claim text.