US4331943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic wave devices having transverse mode distortions eliminated structurally
Assignee: HP Inc
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Filing: 1980-12-22
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Granted: 1982-05-25
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Expires: 2000-12-22
Abstract
Abstract The interfering resonances of transverse modes are moade to occur far from the fundamental resonant frequency in a surface acoustic wave (SAW) resonator by connecting a plurality of SAW sub-devices in parallel. The frequency response of this parallel combination is essentially undistorted. Interfering spurious resonances caused by the transverse modes become inconsequential. These devices have a substantially higher power handling capability as compared to conventional resonators with comparable Q. This capability reduces the phase noise of oscillators stabilized by these resonators.
Inventors
- 👤 Peter S. Cross
- 👤 William R. Shreve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:26
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6423; H03H9/6433; H03H9/644; H03H9/6443; H03H9/645; H03H9/02; H03H9/02535; H03H9/02818; H03H9/125; H03H9/145; H03H9/14544; H03H9/1455; H03H9/25; H03H9/6456; H03H9/6469
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A surface acoustic wave resonator comprising a plurality of substantially identical surface acoustic wave sub-devices, wherein each of said sub-devices comprises: common substrate having at least a surface layer of piezoelectric material; means defining first and second reflecting grating structures of surface acoustic waves on the piezoelectric surface for providing a standing wave resonance pattern in at least one region of the piezoelectric surface of said substrate; at least a first transducer on a region of the piezoelectric surface for launching said surface acoustic waves on the piezoelectric surface of said substrate in response to input electrical energy applied thereto; and a first common connector coupled to said first transducer of each sub-device for parallel operation of said plurality of sub-devices.
Claim 2
Dependent Claim
121 words
A surface acoustic wave resonator comprising a plurality of substantially identical surface acoustic wave sub-devices, wherein each of said sub-devices comprises: common substrate having at least a surface layer of piezoelectric material; means defining first and second reflecting grating structures of surface acoustic waves on the piezoelectric surface for providing a standing wave resonance pattern in at least one region of the piezoelectric surface of said substrate; at least a first transducer on a region of the piezoelectric surface for launching said surface acoustic waves on the piezoelectric surface of said substrate in response to input electrical energy applied thereto; and a first common connector coupled to said first transducer of each sub-device for parallel operation of said plurality of sub-devices.
Claim 3
Dependent Claim
59 words
The surface acoustic wave resonator as in claim 1 wherein each of said sub-devices further comprises: a second transducer on a region of the piezoelectric surface responsive to said standing wave resonance pattern for providing output electrical energy; and a second common connector coupled to said second transducer of each sub-device for parallel operation of said plurality of sub-devices.
Claim 4
Dependent Claim
32 words
The surface acoustic wave resonator as in claim 1 wherein said first common connector comprises a plurality of parallel electrodes, each made periodically extensive with said first and second reflecting grating structures.
Claim 5
Dependent Claim
36 words
The surface acoustic wave resonator as in claim 2 wherein each of said first and second common connectors comprises a plurality of parallel electrodes, each made periodically extensive with said first and second reflecting grating structures.
Claim 6
Dependent Claim
18 words
The surface acoustic wave resonator as in claim 1 wherein said first common connector is a stitch bond.
Claim 7
Dependent Claim
22 words
The surface acoustic wave resonator as in claim 2 wherein each of said first and second common connectors is a stitch bond.
Claim 8
Independent Claim
73 words
A method of minimizing adverse effects of transverse mode resonances in a surface acoustic wave resonator comprising the steps of: fabricating on a common substrate a plurality of substantially identical surface acoustic wave sub-devices, each having at least a first transducer and each being made sufficiently narrow in aperture to move transverse modes away from its resonant frequency; making a common connection of the sub-device first transducers; and operating the sub-devices in parallel.
Claim 9
Independent Claim
73 words
A method of minimizing adverse effects of transverse mode resonances in a surface acoustic wave resonator comprising the steps of: fabricating on a common substrate a plurality of substantially identical surface acoustic wave sub-devices, each having at least a first transducer and each being made sufficiently narrow in aperture to move transverse modes away from its resonant frequency; making a common connection of the sub-device first transducers; and operating the sub-devices in parallel.
Claim 10
Dependent Claim
44 words
The method as in claim 7, wherein: said step of fabricating provides a plurality of substantially identical surface acoustic wave sub-devices, each further having a second transducer; and said method further comprises the step of making a common connection of the sub-device second transducers.
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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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |