US3569971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual band cavity backed antenna for radio navigation
Assignee: Collins Radio Co
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Filing: 1969-09-05
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Granted: 1971-03-09
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Expires: 1989-09-05
Abstract
Abstract A radio navigation antenna operable in either the P communication band or the L communication band. A housing mountable in a rotatable support means in the body of an aircraft accommodates a planar P band radiating element and a pair of Lband folded monopoles such that interference is minimized among the radiating elements and 180* radiation patterns may be generated by the respective radiating elements.
Inventors
- 👤 Leslie V Griffee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:01
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A radio navigation antenna comprising a housing defining a cavity having an open end and a closed end, a planar radiating element mounted across said open end, said planar radiating element having an elongated opening in an intermediate portion, and a pair of folded monopole elements mounted in said cavity near said closed end and having intermediate portions essentially coplanar with said planar radiating element and positioned in said elongated opening.
Claim 2
Dependent Claim
71 words
A radio navigation antenna comprising a housing defining a cavity having an open end and a closed end, a planar radiating element mounted across said open end, said planar radiating element having an elongated opening in an intermediate portion, and a pair of folded monopole elements mounted in said cavity near said closed end and having intermediate portions essentially coplanar with said planar radiating element and positioned in said elongated opening.
Claim 3
Dependent Claim
29 words
A radio navigation antenna as defined by claim 1 wherein said planar radiating element functions in the P-band and said pair of folded monopole elements function in the L-band.
Claim 4
Dependent Claim
32 words
A radio navigation antenna as defined by claim 1 and including feed means for electrically feeding said planar radiating element, said feed means being mounted in said housing near said open end.
Claim 5
Dependent Claim
34 words
A radio navigation antenna as defined by claim 1 and including feed means for electrically feeding each of said folded monopole elements, said feed means being mounted in said housing near said closed end.
Claim 6
Dependent Claim
60 words
A radio navigation antenna as defined by claim 1 and including first feed means for electrically feeding said planar radiating element, said first feed means being mounted in said housing near said open end, and second feed means for electrically feeding each of said folded monopole elements, said second feed means being mounted in said housing near said closed end.
Claim 7
Dependent Claim
21 words
A radio navigation antenna as defined by claim 5 wherein said folded monopole elements are phased at approximately 180 electrical degrees.
Claim 8
Dependent Claim
21 words
A radio navigation antenna as defined by claim 1 wherein said folded monopole elements are phased at approximately 180 electrical degrees.
Claim 9
Dependent Claim
137 words
A radio navigation antenna compatible with aviation navigation systems operating in the P-band and L-band comprising a housing defining a cavity and having an open end and a closed end, a planar radiating element mounted across said open end and designed to function in said P-band, an elongated opening in an intermediate portion of said planar radiating element, feed means mounted in said housing near said open end for electrically feeding said planar radiating element at two opposing points on the periphery thereof, a pair of folded monopole elements mounted in said cavity having intermediate portions essentially coplanar with said planar radiating element and positioned in said elongated opening, said folded monopole elements designed to function in said L-band, and feed means mounted in said housing away from said open end for electrically feeding said folded monopoles.
Claim 10
Dependent Claim
137 words
A radio navigation antenna compatible with aviation navigation systems operating in the P-band and L-band comprising a housing defining a cavity and having an open end and a closed end, a planar radiating element mounted across said open end and designed to function in said P-band, an elongated opening in an intermediate portion of said planar radiating element, feed means mounted in said housing near said open end for electrically feeding said planar radiating element at two opposing points on the periphery thereof, a pair of folded monopole elements mounted in said cavity having intermediate portions essentially coplanar with said planar radiating element and positioned in said elongated opening, said folded monopole elements designed to function in said L-band, and feed means mounted in said housing away from said open end for electrically feeding said folded monopoles.
References Cited (Backward Citations)
US3239838A
Cited
US3261018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |