US3205498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual mode radar beacon antenna
Assignee: North American Aviation Corp
•
Filing: 1960-11-30
•
Granted: 1965-09-07
•
Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Claude H Child
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:12
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN AN ANTENNA SYSTEM THE COMBINATION OF A RECTANGULARR WAVEGUIDE SECTION; A CYLINDRICAL WAVEGUIDE SECTION FOR SUPPORTING A TM01 MODE AND COMMUNICATING WITH A BROAD SIDE OF SAID RECTANGULAR GUIDE SECTIN; IMPEDANCE MATCHING MEANS DISPOSED BETWEEN SAID RECTANTULAR AND SAID CYLINDRICAL SECTIONS AND PRESENTING A DISCONTINUITY FOR EXCITING A TE11 MODE, THE RELATIVE MAGNITUDE OF THE TM01 MODE TO THE TE11 MODE BEING 10 DB; A QUARTER WAVE PLATE DISPOSED IN SAID CYLINDRICAL SECTION SYMMETRICALLY ABOUT THE LONGITUDINAL AXIS OF SAID CYLINDRICAL SECTION AT AN ANGLE OF 45 DEGREES WITH THE WAVEGUIDE AXIS OF SAID RECTANGULAR WAVEGUIDE SECTION; AND MEANS FOR MOUNTING SAID SYSTEM IN AN OUTER WALL OF A FUSELAGE, SAID MEANS BEING TRANSPARENT TO ELECTROMAGNETIC RADIATION AND ADAPTED TO CLOSE THE END OF SAID CYLINDRICAL SECTION OPPOSITE TO THAT COMMUNICATING WITH SAID RECTANGULAR SECTION.
Claim 2
Dependent Claim
136 words
IN AN ANTENNA SYSTEM THE COMBINATION OF A RECTANGULARR WAVEGUIDE SECTION; A CYLINDRICAL WAVEGUIDE SECTION FOR SUPPORTING A TM01 MODE AND COMMUNICATING WITH A BROAD SIDE OF SAID RECTANGULAR GUIDE SECTIN; IMPEDANCE MATCHING MEANS DISPOSED BETWEEN SAID RECTANTULAR AND SAID CYLINDRICAL SECTIONS AND PRESENTING A DISCONTINUITY FOR EXCITING A TE11 MODE, THE RELATIVE MAGNITUDE OF THE TM01 MODE TO THE TE11 MODE BEING 10 DB; A QUARTER WAVE PLATE DISPOSED IN SAID CYLINDRICAL SECTION SYMMETRICALLY ABOUT THE LONGITUDINAL AXIS OF SAID CYLINDRICAL SECTION AT AN ANGLE OF 45 DEGREES WITH THE WAVEGUIDE AXIS OF SAID RECTANGULAR WAVEGUIDE SECTION; AND MEANS FOR MOUNTING SAID SYSTEM IN AN OUTER WALL OF A FUSELAGE, SAID MEANS BEING TRANSPARENT TO ELECTROMAGNETIC RADIATION AND ADAPTED TO CLOSE THE END OF SAID CYLINDRICAL SECTION OPPOSITE TO THAT COMMUNICATING WITH SAID RECTANGULAR SECTION.
References Cited (Backward Citations)
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Cited
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Cited
US2939094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |