US5838091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave device including IDT electrode having solid electrode portion and split electrode portion
Assignee: Murata Manufacturing Co Ltd
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Filing: 1996-04-03
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Granted: 1998-11-17
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Expires: 2016-04-03
Abstract
Abstract A surface acoustic wave device achieving improved insertion loss and fraction defective without lowering the TTE level includes an IDT electrode located on a piezoelectric substrate. The IDT electrode includes a solid electrode portion and a split electrode portion continuously formed at an end of the solid electrode portion in the propagating direction of a surface acoustic wave and having an electrode finger width of about λ/8 wherein λ is the wavelength of the surface acoustic wave.
Inventors
- 👤 Toru Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:08
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/14552; H03H9/14576; H03H9/14582
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said solid electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode interval between said split electrode portion and said solid electrode portion is about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval has an electrode finger width of about 5λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 2
Dependent Claim
128 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said solid electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode interval between said split electrode portion and said solid electrode portion is about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval has an electrode finger width of about 5λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 3
Dependent Claim
107 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said solid electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode finger interval at a border between said solid electrode portion and said split electrode portion is about 3λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 4
Dependent Claim
107 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said solid electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode finger interval at a border between said solid electrode portion and said split electrode portion is about 3λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 5
Dependent Claim
181 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode interval between said split electrode portion and said solid electrode portion is about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval has an electrode finger width of about 5λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 6
Dependent Claim
181 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode interval between said split electrode portion and said solid electrode portion is about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval has an electrode finger width of about 5λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 7
Dependent Claim
160 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode finger interval at a border between said solid electrode portion and said split electrode portion is about 3λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 8
Dependent Claim
160 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, said split electrode portion comprising a plurality of interdigitating electrode fingers which are meshed alternatively two by two, wherein an electrode finger interval at a border between said solid electrode portion and said split electrode portion is about 3λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 9
Dependent Claim
109 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, an electrode interval between said split electrode portion and said solid electrode portion being about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval having an electrode finger width of about five λ/16, wherein λ is a wavelength of the surface acoustic wave.
Claim 10
Dependent Claim
109 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, an electrode interval between said split electrode portion and said solid electrode portion being about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval having an electrode finger width of about five λ/16, wherein λ is a wavelength of the surface acoustic wave.
Claim 11
Dependent Claim
88 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said solid electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, an electrode finger interval at a border between said solid electrode portion and said split electrode portion being about 3λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 12
Dependent Claim
88 words
A surface acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer electrode disposed on said piezoelectric substrate and including a solid electrode portion and a split electrode portion, said split electrode portion being continuously formed at an end of said solid electrode portion in a propagating direction of a surface acoustic wave generated on said piezoelectric substrate, an electrode finger interval at a border between said solid electrode portion and said split electrode portion being about 3λ/16, where λ is a wavelength of the surface acoustic wave.
Claim 13
Dependent Claim
164 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, an electrode interval between said split electrode portion and said solid electrode portion being about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval has an electrode finger width of about 5λ/16, where λ is a wavelength of the surface of the acoustic wave.
Claim 14
Dependent Claim
164 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, an electrode interval between said split electrode portion and said solid electrode portion being about λ/8 and an electrode finger at an end of said solid electrode portion closest to said electrode interval has an electrode finger width of about 5λ/16, where λ is a wavelength of the surface of the acoustic wave.
Claim 15
Dependent Claim
143 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, an electrode finger interval at a border between said solid electrode portion and said split electrode portion being about 3λ/16, where λ is a wavelength of the surface of the acoustic wave.
Claim 16
Dependent Claim
143 words
A surface acoustic wave device comprising: a piezoelectric substrate; a first surface acoustic wave transducer for excitation of a surface acoustic wave and a second surface acoustic wave transducer for receiving of the surface acoustic wave arranged in parallel on said piezoelectric substrate in a propagating direction of the surface acoustic wave, wherein an interdigital transducer electrode forming one of said first and second surface acoustic wave transducers is comprised of a solid electrode, and an interdigital transducer electrode forming the other of said first and second surface acoustic wave transducers includes a solid electrode portion and a split electrode portion continuously formed at an end of said solid electrode portion, an electrode finger interval at a border between said solid electrode portion and said split electrode portion being about 3λ/16, where λ is a wavelength of the surface of the acoustic wave.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-16 | 2002-05-18 | 2002-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-16 | 2006-05-18 | 2006-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-16 | 2010-05-18 | 2010-11-17 | $7700.00 | Window Closed / Lapsed |