US3742390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi frequency microstrip filter detector
Assignee: United States Department of the Air Force
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Filing: 1971-11-23
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Granted: 1973-06-26
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Expires: 1991-11-23
Abstract
Abstract A filter-detector for selecting one or a number of narrow band microwave signals from either a wide band of microwave signals or from a source of spurious signals including a microstrip circuit with coupling strips for coupling frequencies predetermined by resonators located on the circuit board and diodes at the output of each coupler branchline for detecting the signal.
Inventors
- 👤 M Stiglitz
- 👤 J Sethares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:57
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
A multi-frequency filter detector comprising: a frame; a dielectric circuit board mounted within the frame; an input circuit means mounted centrally of said frame and extending the length thereof; a plurality of output circuit means placed adjacent said input circuit, on either side thereof, in a spaced relationship, said output circuit means including means for coupling a selected frequency from said input circuit means and detector means to provide an output signal.
Claim 2
Dependent Claim
72 words
A multi-frequency filter detector comprising: a frame; a dielectric circuit board mounted within the frame; an input circuit means mounted centrally of said frame and extending the length thereof; a plurality of output circuit means placed adjacent said input circuit, on either side thereof, in a spaced relationship, said output circuit means including means for coupling a selected frequency from said input circuit means and detector means to provide an output signal.
Claim 3
Dependent Claim
20 words
A multi-frequency filter detector according to claim 1 a conductive ground plane mounted in juxtaposition with said dielectric circuit board.
Claim 4
Dependent Claim
16 words
A multi-frequency filter detector according to claim 1 wherein said coupling means inclUdes a dielectric resonator.
Claim 5
Dependent Claim
17 words
A multi-frequency filter detector according to claim 1 wherein, said detector means is a Schottley-barrier beam diode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |