US4028708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna feed for dual beam conical scan tracking radar
Assignee: United States Department of the Navy
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Filing: 1975-10-10
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Granted: 1977-06-07
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Expires: 1995-10-10
Abstract
Abstract An improved antenna feed providing control of the plane of polarization ecially useful with "scanning with compensation" radar tracking. An input transducer is coupled to first and second output transducers whereby the output transducers transmit two pencil-beam radiation patterns which are squinted by equal but opposite angles with respect to the scan axis. During reception, however, a non-reciprocal coupling means provides for separate sensing of the return signals rceived by the first and second output means and converts the signal received by the second output means so that it is in quadrature relationship with the signal received by the first output means.
Inventors
- 👤 Elmer Donald Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:17
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/422; G01S7/00; G01S7/02; G01S7/024; H; H01; H01Q; H01Q3/00; H01Q3/02; H01Q3/08; H01Q3/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
An antenna feed for a dual beam conical scanning radar comprising: input means for resolving an input signal into its vertical and horizontal polarization components; first and second means for outputting first and second output signals that are identically polarized to each other and to said input signal and for receiving return signals; coupling means for coupling said input means to said first and second means and for separating a return signal received by said first and second means into a first component and a second component in quadrature with said first component, said coupling means comprising a non-reciprocal cross connection between said first and second means, whereby said antenna feed provides for control of the plane of polarization of the transmitted and received signals.
Claim 2
Dependent Claim
125 words
An antenna feed for a dual beam conical scanning radar comprising: input means for resolving an input signal into its vertical and horizontal polarization components; first and second means for outputting first and second output signals that are identically polarized to each other and to said input signal and for receiving return signals; coupling means for coupling said input means to said first and second means and for separating a return signal received by said first and second means into a first component and a second component in quadrature with said first component, said coupling means comprising a non-reciprocal cross connection between said first and second means, whereby said antenna feed provides for control of the plane of polarization of the transmitted and received signals.
Claim 3
Dependent Claim
18 words
The antenna feed of claim 1 wherein said first and said second means are dual-mode rectangular-to-circular waveguide transducers.
Claim 4
Dependent Claim
25 words
The antenna feed of claim 2 wherein said input means comprises a first dual-mode rectangular-to-circular waveguide transducer coupled to a second dual-mode rectangular-to-circular waveguide transducer.
Claim 5
Dependent Claim
31 words
The antenna feed for claim 3 wherein said coupling means includes first and second power dividers connected between said second dual-mode rectangular-to-circular waveguide transducer and said first and second means, respectively.
Claim 6
Dependent Claim
29 words
The antenna feed of claim 4 wherein said coupling means further includes first and second three-port circulators connected between said first and second power dividers and said first means.
Claim 7
Dependent Claim
78 words
The antenna feed of claim 5 wherein said coupling means further includes first (a) and second (c) transmission means coupling, respectively, said first and second power dividers to said first and second circulators, said first transmission means being one-forth wavelength longer than said second transmission means; and third (b) and fourth (d) transmission means coupling, respectively, said first and second circulators to said first means, said fourth transmission means being one-fourth wavelength longer than said third transmission means.
Claim 8
Dependent Claim
24 words
The antenna feed of claim 6 wherein one port of said first three-port circulator is connected to one port of said second three-port circulator.
Claim 9
Dependent Claim
177 words
An antenna feed for a dual beam conical scanning radar comprising: input means for receiving the vector components of an input signal and for synthesizing the resultant of such components into a signal of controlled polarization and resolving said signal into orthogonal vector components in a frame of coordinates rotating with respect to said input means; first and second means for outputting as radiated beams first and second output signals that are identically polarized to each other and to said input signal and for receiving return signals, said first and second means being symmetrically disposed about the axis of rotation of said rotating frame of coordinates and adapted for rotating therewith in such manner as to conically scan said radiated beams; and coupling means for coupling said input means to said first and second means and for separating a return signal received by said first and second means into, respectively, a first component and a second component in quadrature with said first component, said coupling means comprising a non-reciprocal cross connection between said first and second means.
Claim 10
Dependent Claim
177 words
An antenna feed for a dual beam conical scanning radar comprising: input means for receiving the vector components of an input signal and for synthesizing the resultant of such components into a signal of controlled polarization and resolving said signal into orthogonal vector components in a frame of coordinates rotating with respect to said input means; first and second means for outputting as radiated beams first and second output signals that are identically polarized to each other and to said input signal and for receiving return signals, said first and second means being symmetrically disposed about the axis of rotation of said rotating frame of coordinates and adapted for rotating therewith in such manner as to conically scan said radiated beams; and coupling means for coupling said input means to said first and second means and for separating a return signal received by said first and second means into, respectively, a first component and a second component in quadrature with said first component, said coupling means comprising a non-reciprocal cross connection between said first and second means.
References Cited (Backward Citations)
US3803617A
Cited
US3936838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |