US4315228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple co-surface acoustic wave filters
Assignee: Northrop Grumman Corp
•
Filing: 1980-07-03
•
Granted: 1982-02-09
•
Expires: 2000-07-03
Abstract
Abstract Apparatus for providing a plurality of filtered outputs is described incorporating a substrate suitable for propagating surface acoustic waves having an input transducer, a first plurality of spaced-apart taps coupled together, a second plurality of spaced-apart taps coupled together where at least two of the second plurality of taps are positioned in spaces between the first plurality of taps. The invention overcomes the problem of providing separate substrate surface area for each plurality of taps coupled together.
Inventors
- 👤 Robert A. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:49
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/70; H03H9/72; H03H9/46; H03H9/64; H03H9/6406; H03H9/02; H03H9/125; H03H9/145; H03H9/14502; H03H9/14505; H03H9/14508
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
99 words
Apparatus for providing a plurality of filtered outputs comprising: a substrate having a surface suitable for propagating surface acoustic waves, an input transducer for launching surface acoustic waves in said substrate, a first plurality of evenly spaced-apart taps coupled together for providing a first output signal, a second plurality of spaced-apart taps coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps and wherein the spacing between said first plurality of taps is less than the spacing between said second plurality of taps.
Claim 2
Dependent Claim
99 words
Apparatus for providing a plurality of filtered outputs comprising: a substrate having a surface suitable for propagating surface acoustic waves, an input transducer for launching surface acoustic waves in said substrate, a first plurality of evenly spaced-apart taps coupled together for providing a first output signal, a second plurality of spaced-apart taps coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps and wherein the spacing between said first plurality of taps is less than the spacing between said second plurality of taps.
Claim 3
Dependent Claim
110 words
Apparatus for providing a plurality of filtered outputs comprising: a substrate having a surface suitable for propagating surface acoustic waves, an input transducer for launching surface acoustic waves in said substrate, a first plurality of spaced-apart taps coupled together for providing a first output signal, a second plurality of spaced-apart taps coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps and a third plurality of spaced-apart taps coupled together for providing a third output signal, at least two of said third plurality of taps positioned in spaces between said first plurality of taps.
Claim 4
Dependent Claim
110 words
Apparatus for providing a plurality of filtered outputs comprising: a substrate having a surface suitable for propagating surface acoustic waves, an input transducer for launching surface acoustic waves in said substrate, a first plurality of spaced-apart taps coupled together for providing a first output signal, a second plurality of spaced-apart taps coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps and a third plurality of spaced-apart taps coupled together for providing a third output signal, at least two of said third plurality of taps positioned in spaces between said first plurality of taps.
Claim 5
Dependent Claim
121 words
Apparatus for providing a plurality of frequencies comprising: a substrate having a surface suitable for propagating surface acoustic waves, a first transducer positioned on said substrate for launching surface acoustic waves, a first plurality of spaced-apart taps having spaces for selecting a first frequency coupled together for providing a first output signal, a second plurality of spaced-apart taps having tap spacings for selecting a second frequency coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps, means for amplifying said first and second output signals, and means for coupling said amplified signals to the input of said first transducer to form a recirculating signal path.
Claim 6
Dependent Claim
121 words
Apparatus for providing a plurality of frequencies comprising: a substrate having a surface suitable for propagating surface acoustic waves, a first transducer positioned on said substrate for launching surface acoustic waves, a first plurality of spaced-apart taps having spaces for selecting a first frequency coupled together for providing a first output signal, a second plurality of spaced-apart taps having tap spacings for selecting a second frequency coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps, means for amplifying said first and second output signals, and means for coupling said amplified signals to the input of said first transducer to form a recirculating signal path.
Claim 7
Dependent Claim
15 words
The apparatus of claim 3 wherein said first plurality of spaced-apart taps are evenly spaced.
Claim 8
Dependent Claim
15 words
The apparatus of claim 4 wherein said second plurality of spaced-apart taps are evenly spaced.
Claim 9
Dependent Claim
25 words
The apparatus of claim 4 wherein the spacing between said first plurality of taps is less than the spacing between said second plurality of taps.
Claim 10
Dependent Claim
39 words
The apparatus of claim 3 further including a third plurality of spaced-apart taps coupled together for providing a third output signal, at least two of said third plurality of taps positioned in spaces between said first plurality of taps.
Claim 11
Dependent Claim
17 words
The apparatus of claim 2 or 7 wherein said third plurality of spaced-apart taps are evenly spaced.
Claim 12
Dependent Claim
14 words
The apparatus of claim 3 further including means for amplifying said third output signal.
Claim 13
Dependent Claim
19 words
The apparatus of claim 3 further including means for limiting the amplitude of said first and second output signals.
Claim 14
Dependent Claim
17 words
The apparatus of claim 3 further including means for coupling an input signal to said first transducer.
Claim 15
Dependent Claim
30 words
The apparatus of claim 3 further including a second transducer positioned on said substrate for launching surface acoustic waves and means for coupling an input signal to said second transducer.
Claim 16
Dependent Claim
17 words
The apparatus of claim 11 or 12 wherein said input signal includes predetermined frequencies evenly spaced apart.
Claim 17
Dependent Claim
164 words
A plurality of delay line oscillators for providing a plurality of frequencies comprising: a substrate having a surface suitable for propagating surface acoustic waves, a first transducer positioned on said substrate for launching surface acoustic waves, a first plurality of spaced-apart taps having spaces for selecting a first frequency coupled together for providing a first output signal, a second plurality of spaced-apart taps having tap spacings for selecting a second frequency coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps, means for amplifying said first and second output signals, and means for coupling said amplified signals to the input of said first transducer to form a recirculating signal path, an input signal having a number of predetermined frequencies evenly spaced apart including said first and second frequencies, means for coupling said input signal to said first transducer for injecting said input signal into said recirculating signal path.
Claim 18
Dependent Claim
164 words
A plurality of delay line oscillators for providing a plurality of frequencies comprising: a substrate having a surface suitable for propagating surface acoustic waves, a first transducer positioned on said substrate for launching surface acoustic waves, a first plurality of spaced-apart taps having spaces for selecting a first frequency coupled together for providing a first output signal, a second plurality of spaced-apart taps having tap spacings for selecting a second frequency coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps, means for amplifying said first and second output signals, and means for coupling said amplified signals to the input of said first transducer to form a recirculating signal path, an input signal having a number of predetermined frequencies evenly spaced apart including said first and second frequencies, means for coupling said input signal to said first transducer for injecting said input signal into said recirculating signal path.
Claim 19
Dependent Claim
174 words
A plurality of delay line oscillators for providing a plurality of frequencies comprising: a substrate having a surface suitable for propagating surface acoustic waves, a first transducer positioned on said substrate for launching surface acoustic waves, a first plurality of spaced-apart taps having spaces for selecting a first frequency coupled together for providing a first output signal, a second plurality of spaced-apart taps having tap spacings for selecting a second frequency coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps, means for amplifying said first and second output signals, and means for coupling said amplified signals to the input of said first transducer to form a recirculating signal path, a second transducer positioned on said substrate for launching surface acoustic waves, an input signal having a number of predetermined frequencies evenly spaced apart including said first and second frequencies, means for coupling said input signal to said second transducer for injecting said input signal into said substrate.
Claim 20
Dependent Claim
174 words
A plurality of delay line oscillators for providing a plurality of frequencies comprising: a substrate having a surface suitable for propagating surface acoustic waves, a first transducer positioned on said substrate for launching surface acoustic waves, a first plurality of spaced-apart taps having spaces for selecting a first frequency coupled together for providing a first output signal, a second plurality of spaced-apart taps having tap spacings for selecting a second frequency coupled together for providing a second output signal, at least two of said second plurality of taps positioned in spaces between said first plurality of taps, means for amplifying said first and second output signals, and means for coupling said amplified signals to the input of said first transducer to form a recirculating signal path, a second transducer positioned on said substrate for launching surface acoustic waves, an input signal having a number of predetermined frequencies evenly spaced apart including said first and second frequencies, means for coupling said input signal to said second transducer for injecting said input signal into said substrate.
References Cited (Backward Citations)
US3754192A
Cited
US3736587A
Cited
US3852540A
Cited
US3855556A
Cited
US3831116A
Cited
US3855548A
Cited
US4100498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |