US3886504A
Expired / Lapsed
US
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Acoustic surface wave resonator devices
Assignee: Texas Instruments Inc
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Filing: 1974-05-20
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Granted: 1975-05-27
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Expires: 1994-05-20
Abstract
Abstract This disclosure concerns acoustic surface wave resonator devices having particular applicability as bandpass filters and oscillator frequency control elements at VHF and UHF frequency ranges. In a basic form of the acoustic surface wave resonator device, first and second grating structures are arranged in spaced aligned relationship on a substrate of piezoelectric material with an interdigitated acoustic surface wave transducer interposed therebetween. The grating structures provide plural edge reflectors on opposite sides of the surface wave transducer and are so positioned in relation thereto to set up a standing wave resonance condition with a controlled bandwidth from the reflection of acoustic signals generated by the transducer. In another form, input and output acoustic surface wave transducers are interposed between first and second grating structures, wherein the output transducer couples electrical energy out of the resonator device. Either acoustic or electrical coupling may also be introduced between the input and output transducers to further improve signal transmission.
Inventors
- 👤 Clinto Sylvester Hartmann
- 👤 Ronald Carl Rosenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6423; H03H9/6433; H03H9/0023; H03H9/0028; H03H9/0033; H03H9/0038; H03H9/0042; H03H9/643; H03H9/6436; H03H9/644; H03H9/6443; H03H9/6446
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
110 words
A surface wave resonator device comprising: substrate means having at least a surface layer of piezoelectric material. acoustic surface wave transducer means disposed on said piezoelectric surface of said substrate means and being operable to convert an input electrical signal to acoustic surface waves propagating on said piezoelectric surface of said substrate means, and means defining first and second reflective grating structures on the piezoelectric surface of said substrate means on opposite sides of said acoustic surface wave transducer means and being responsive to acoustic surface waves generated thereby to provide at least one region on the piezoelectric surface of said substrate means wherein a standing wave resonance condition occurs.
Claim 2
Dependent Claim
110 words
A surface wave resonator device comprising: substrate means having at least a surface layer of piezoelectric material. acoustic surface wave transducer means disposed on said piezoelectric surface of said substrate means and being operable to convert an input electrical signal to acoustic surface waves propagating on said piezoelectric surface of said substrate means, and means defining first and second reflective grating structures on the piezoelectric surface of said substrate means on opposite sides of said acoustic surface wave transducer means and being responsive to acoustic surface waves generated thereby to provide at least one region on the piezoelectric surface of said substrate means wherein a standing wave resonance condition occurs.
Claim 3
Dependent Claim
21 words
A resonator device as set forth in claim 1. wherein sais substrate means comprises a substrate made entirely of piezoelectric material.
Claim 4
Dependent Claim
55 words
a resonator device as set forth in claim 1, wherein said substrate means comprises a substrate body of non-piezoelectric material, and a layer of piezoelectric material provided on said substrate body and forming said surface of piezoelectrical material on which said acoustic surface wave transducer means and said first and second grating structures are disposed.
Claim 5
Dependent Claim
22 words
A resonator device as set forth in claim 1, wherein said acoustic surface wave transducer means comprises at least one interdigital transducer.
Claim 6
Dependent Claim
33 words
A resonator device as set forth in claim 4, wherein said at least one interdigital transducer includes opposing pads having alternating pairs of electrodes in interidigitated relationship to define a split electrode transducer.
Claim 7
Dependent Claim
22 words
A resonator device as set forth in claim 1, wherein said acoustic surface wave transducer means comprises input and output interdigital transducers.
Claim 8
Dependent Claim
30 words
A resonator device as set forth in claim 6, further including acoustic coupling means disposed between said input and output interdigital transducers for acoustically coupling the energy being transmitted therebetween.
Claim 9
Dependent Claim
46 words
A resonator device as set forth in claim 7, wherein said acoustic coupling means comprises a reflective grating structure having a plurality of discontinuities located at the piezoelectric surface of said substrate means for reflecting at least a portion of the surface wave energy incident thereon.
Claim 10
Dependent Claim
50 words
A resonator device as set forth in claim 1, wherein each of said reflective grating structures comprises a plurality of spaced discontinuities located at the piezoelectric surface of said substrate means, each of said discontinuities being capable of reflecting at least a portion of the surface wave energy incident thereon.
Claim 11
Dependent Claim
31 words
A resonator device as set forth in claim 9, wherein each of said discontinuities comprises a narrow strip of electrically conductive material located at the piezoelectric surface of said substrate means.
Claim 12
Dependent Claim
30 words
A resonator device as set forth in claim 9, wherein each of said discontinuities comprises a narrow strip of dielectric material located at the piezoelectric surface of said substrate means.
Claim 13
Dependent Claim
27 words
A resonator device as set forth in claim 9, wherein each of said discontinuities comprises a narrow depression formed in the piezoelectric surface of said substrate means.
Claim 14
Dependent Claim
72 words
A resonator device as set forth in claim 1, wherein said reflective grating structures are separated by approximately an integral number of half-wavelengths at the center frequency of said resonator device and wherein each of said grating structures comprises a plurality of spaced discontinuities to the propagation of acoustic surface waves, the spacing between adjacent discontinuities of each of said grating structures being substantially equal to one half-wavelength at said center frequency.
Claim 15
Dependent Claim
35 words
A resonator device as set forth in claim 1, further including absorptive means disposed at the opposite ends of the piezoelectric surface of said substrate means for suppressing edge reflections of the acoustic surface waves.
Claim 16
Dependent Claim
163 words
A multi-resonator structure comprising a plurality of acoustic surface wave resonators coupled to provide a specified overall frequency response, at least one of said resonators being disposed so as to be directly responsive to an input electrical signal and at least one of said resonators being disposed so as to directly provide an output electrical signal wherein each of said resonators comprises: substrate means having at least a surface layer of piezoelectric material, an input acoustic surface wave transducer for launching acoustic surface waves on the piezoelectric surface of said substrate means responsive to input electrical energy, means defining first and second reflective grating structures on the piezoelectric surface of said substrate means and being responsive to said acoustic surface waves for providing a standing wave resonance pattern in at least one region of the piezoelectric surface of said substrate means and an output acoustic surface wave transducer responsive to said standing wave resonance pattern for the purpose of providing output electrical energy.
Claim 17
Dependent Claim
163 words
A multi-resonator structure comprising a plurality of acoustic surface wave resonators coupled to provide a specified overall frequency response, at least one of said resonators being disposed so as to be directly responsive to an input electrical signal and at least one of said resonators being disposed so as to directly provide an output electrical signal wherein each of said resonators comprises: substrate means having at least a surface layer of piezoelectric material, an input acoustic surface wave transducer for launching acoustic surface waves on the piezoelectric surface of said substrate means responsive to input electrical energy, means defining first and second reflective grating structures on the piezoelectric surface of said substrate means and being responsive to said acoustic surface waves for providing a standing wave resonance pattern in at least one region of the piezoelectric surface of said substrate means and an output acoustic surface wave transducer responsive to said standing wave resonance pattern for the purpose of providing output electrical energy.
Claim 18
Dependent Claim
25 words
A multi-resonator structure as set forth in claim 15, wherein said substrate means comprises a single substrate on which all of said resonators are located.
Claim 19
Dependent Claim
25 words
A multi-resonator structure as set forth in claim 16, further including means for reducing the amount of acoustic cross coupling between pairs of said resonators.
Claim 20
Dependent Claim
165 words
A surface wave resonator device comprising: substrate means having at least a surface layer of piezoelectric material. input and output resonator sections provided on said piezoelectric surface of said substrate means in juxtaposed spaced relationship, each of said input and output resonator sections including an acoustic surface wave transducer and a pair of reflective grating structures including respective pluralities of discontinuity elements disposed in spaced apart aligned relation on opposite sides of said transducer. said transducer of said input resonator section being responsive to an electrical signal for generating acoustic surface waves in said piezoelectric surface of said substrate means. electrical coupling means extending between said input and output resonator sections and being so arranged with respect to said pairs of reflective grating structures of said input and output resonator sections to couple acoustic energy therebetween for achieving a standing wave resonance pattern, and and transducer of said output resonator section being responsive to said standing wave resonance pattern for producing an electrical output signal.
Claim 21
Dependent Claim
165 words
A surface wave resonator device comprising: substrate means having at least a surface layer of piezoelectric material. input and output resonator sections provided on said piezoelectric surface of said substrate means in juxtaposed spaced relationship, each of said input and output resonator sections including an acoustic surface wave transducer and a pair of reflective grating structures including respective pluralities of discontinuity elements disposed in spaced apart aligned relation on opposite sides of said transducer. said transducer of said input resonator section being responsive to an electrical signal for generating acoustic surface waves in said piezoelectric surface of said substrate means. electrical coupling means extending between said input and output resonator sections and being so arranged with respect to said pairs of reflective grating structures of said input and output resonator sections to couple acoustic energy therebetween for achieving a standing wave resonance pattern, and and transducer of said output resonator section being responsive to said standing wave resonance pattern for producing an electrical output signal.
Claim 22
Dependent Claim
100 words
A resonator device as set forth in claim 18, wherein said electrical coupling means comprises first and second multi-strip couplers, saif first and second multi-strip couplers being respectively disposed on opposite sides of the transducers included in said input and output resonator sections and being located between the reflective grating structures and the opposite sides of said transducers, each of said multi-strip couplers comprising a plurality of elongated metallic strips extending transversely of said piezoelectric surface of said substrate means so as to include respective portions thereof in contiguous relation to said transducers of said input and output resonator sections.
Claim 23
Dependent Claim
67 words
A resonator device as set forth in claim 19, wherein the spacing between successive metallic strips included in each of said mUlti-strip couplings as measured from the centers thereof is substantially equal to one-fourth wavelength of the center frequency of the resonator device, and the spacing between successive discontinuity elements of each of said reflective grating structures is substantially equal ton one-half wavelength at said center frequency.
References Cited (Backward Citations)
US3836876A
Cited
US3716809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |