US3104362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave filter
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1959-08-27
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Granted: 1963-09-17
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Expires: 1979-08-27
Abstract
No abstract record available.
Inventors
- 👤 George L Matthaei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:36
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20363
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A BAND-PASS MICROWAVE STRIP TRANSMISSION LINE FILTER HAVING A PREDETERMINED MID-PASS-BAND FREQUENCY AND COMPRISING: A PLURALITY OF ELONGATED CONDUCTORS EACH ARRANGED IN A SPACED-APART BUT OVERLAPPING ADJACENCY WITH ANOTHER OF SAID CONDUCTORS WITH THE OVERLAPPING PORTIONS DEFINING A DISTRIBUTED CAPACITIVE COUPLING THEREBETWEEN; A GROUND MEMBER DISPOSED IN A SPACED-APART ADJACENCY WITH SAID CONDUCTORS; AND AN ELONGATED INDUCTIVE CONNECTION BETWEEN SAID GROUND MEMBER AND EACH OF SAID CONDUCTORS AT A POINT ON THE ORDER OF ONE-QUARTER WAVELENGTH OF SAID MID-PASS-BAND FREQUENCY FROM EACH END OF SAID CONDUCTORS, THEREBY PROVIDING BAND-PASS FILTER RESONATOR ELEMENTS OF THE ONE-QUARTER WAVELENGTH TYPE WHEREIN EACH RESONATOR ELEMENT HAS ONE END INDUCTIVELY COUPLED BY SAID CONNECTIONS AND THE REGION OF THE OTHER END CAPACITIVELY COUPLED BY SAID OVERLAPPING PORTIONS, SAID INDUCTIVE CONNECTIONS HAVING A PHYSICAL LENGTH THAT IS APPRECIABLY LESS THAN THE LENGTH OF SAID RESONATOR ELEMENTS; SAID CAPACITIVE COUPLING BEING A MAJOR PORTION OF THE LENGTH OF SAID RESONATOR ELEMENTS.
Claim 2
Dependent Claim
154 words
A BAND-PASS MICROWAVE STRIP TRANSMISSION LINE FILTER HAVING A PREDETERMINED MID-PASS-BAND FREQUENCY AND COMPRISING: A PLURALITY OF ELONGATED CONDUCTORS EACH ARRANGED IN A SPACED-APART BUT OVERLAPPING ADJACENCY WITH ANOTHER OF SAID CONDUCTORS WITH THE OVERLAPPING PORTIONS DEFINING A DISTRIBUTED CAPACITIVE COUPLING THEREBETWEEN; A GROUND MEMBER DISPOSED IN A SPACED-APART ADJACENCY WITH SAID CONDUCTORS; AND AN ELONGATED INDUCTIVE CONNECTION BETWEEN SAID GROUND MEMBER AND EACH OF SAID CONDUCTORS AT A POINT ON THE ORDER OF ONE-QUARTER WAVELENGTH OF SAID MID-PASS-BAND FREQUENCY FROM EACH END OF SAID CONDUCTORS, THEREBY PROVIDING BAND-PASS FILTER RESONATOR ELEMENTS OF THE ONE-QUARTER WAVELENGTH TYPE WHEREIN EACH RESONATOR ELEMENT HAS ONE END INDUCTIVELY COUPLED BY SAID CONNECTIONS AND THE REGION OF THE OTHER END CAPACITIVELY COUPLED BY SAID OVERLAPPING PORTIONS, SAID INDUCTIVE CONNECTIONS HAVING A PHYSICAL LENGTH THAT IS APPRECIABLY LESS THAN THE LENGTH OF SAID RESONATOR ELEMENTS; SAID CAPACITIVE COUPLING BEING A MAJOR PORTION OF THE LENGTH OF SAID RESONATOR ELEMENTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |