US3611203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated digital transducer for variable microwave delay line
Assignee: Westinghouse Electric Corp
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Filing: 1969-04-16
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Granted: 1971-10-05
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Expires: 1989-04-16
Abstract
Abstract The storage of digital, multiple-tap, variable delay pulse compression and coding is carried out directly at microwave frequencies. Nondispersive acoustical delay crystals are employed with surface wave acoustical grating transducers having a periodic equivalent to an acoustic wavelength. An arrangement employing a plurality of channels is disclosed. In another arrangement, a series of aligned transducers is used to obtain variable delays.
Inventors
- 👤 Herbert W Cooper
- 👤 Robert A Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:14
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A delay line comprising a planar body of piezoelectric crystal material, a plurality of input acoustical grating transducers on the crystal surface for generating surface acoustical waves, a corresponding plurality of output acoustical grating transducers on the crystal surface, each of said output transducers being arranged in the path of the acoustic surface wave of only one of said input transducers thereby forming a plurality of independent channels, each of said acoustical Grating transducers comprising a plurality of parallel conductive fingers spaced on said surface at intervals equal to substantially an odd multiple of a half-wavelength of the acoustic wave.
Claim 2
Dependent Claim
100 words
A delay line comprising a planar body of piezoelectric crystal material, a plurality of input acoustical grating transducers on the crystal surface for generating surface acoustical waves, a corresponding plurality of output acoustical grating transducers on the crystal surface, each of said output transducers being arranged in the path of the acoustic surface wave of only one of said input transducers thereby forming a plurality of independent channels, each of said acoustical Grating transducers comprising a plurality of parallel conductive fingers spaced on said surface at intervals equal to substantially an odd multiple of a half-wavelength of the acoustic wave.
Claim 3
Dependent Claim
22 words
A delay line as set forth in claim 1 wherein the distance between input and output transducers for each channel is equal.
Claim 4
Dependent Claim
35 words
A delay line as set forth in claim 1 wherein the distance between input and output transducers of at least one channel is greater than the distance between input and output transducers of another channel.
Claim 5
Dependent Claim
158 words
A delay line comprising a planar body of piezoelectric crystal material, a plurality of input acoustical grating transducers on the crystal surface for generating surface acoustical waves, a corresponding plurality of output acoustical grating transducers on the crystal surface, each of said output transducers being arranged in the path of the acoustic surface wave of only one of said input transducers thereby forming a plurality of independent channels, each of said acoustical grating transducers comprising a plurality of finger electrodes arranged in an interdigital array with alternate electrodes connected, respectively, to one of a pair of terminals, the spacing between the electrodes connected to a respective terminal being substantially equal to an integral multiple of a wavelength of the acoustical wave whereby the spacing between adjacent electrodes of said array is equal to substantially an odd multiple of a half-wavelength of said acoustical wave, said electrodes being arranged perpendicular to the direction of propagation of the acoustic wave.
Claim 6
Dependent Claim
158 words
A delay line comprising a planar body of piezoelectric crystal material, a plurality of input acoustical grating transducers on the crystal surface for generating surface acoustical waves, a corresponding plurality of output acoustical grating transducers on the crystal surface, each of said output transducers being arranged in the path of the acoustic surface wave of only one of said input transducers thereby forming a plurality of independent channels, each of said acoustical grating transducers comprising a plurality of finger electrodes arranged in an interdigital array with alternate electrodes connected, respectively, to one of a pair of terminals, the spacing between the electrodes connected to a respective terminal being substantially equal to an integral multiple of a wavelength of the acoustical wave whereby the spacing between adjacent electrodes of said array is equal to substantially an odd multiple of a half-wavelength of said acoustical wave, said electrodes being arranged perpendicular to the direction of propagation 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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |