Patent EP0602298A1 successfully refreshed from Google Patents.
US3789407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling beam skew
Assignee: Harris Corp
•
Filing: 1972-02-28
•
Granted: 1974-01-29
•
Expires: 1992-02-28
Abstract
Abstract A method and apparatus for correcting radiated beam skew in a circularly polarized offset fed parabolic reflector antenna by the introduction of a difference pattern of one direction of circular polarization in the transverse plane, and adding it to the sum pattern of a corresponding direction of circular polarization to move the sum pattern to the position of the skewed sum pattern of the other direction of circular polarization. Mechanical means are used to boresight the two superimposed patterns.
Inventors
- 👤 J Rosa
- 👤 H Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:40
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/02; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
150 words
Apparatus for controlling beam skew in a circularly polarized offset-fed parabolic reflector antenna comprising: monopulse feed and comparator means for receiving radiation from said parabolic reflector and for providing a right circular sum signal, a left circular sum signal and a transverse difference signal of one sense of circular polarization, each of said signals having a respective directional pattern; and skew adjustment means connected to said monopulse feed and comparator means for receiving said transverse difference signal and the one of the sum signals which corresponds in sense of circular polarization to that of the transverse difference signal, and for shifting the directional pattern of said corresponding sum signal to the position of the directional pattern of said signal of the other sense of circular polarization; whereby said shifted sum signal pattern and said sum signal pattern of the other sense of circular polarization are readily boresignted by mechanical means.
Claim 2
Dependent Claim
150 words
Apparatus for controlling beam skew in a circularly polarized offset-fed parabolic reflector antenna comprising: monopulse feed and comparator means for receiving radiation from said parabolic reflector and for providing a right circular sum signal, a left circular sum signal and a transverse difference signal of one sense of circular polarization, each of said signals having a respective directional pattern; and skew adjustment means connected to said monopulse feed and comparator means for receiving said transverse difference signal and the one of the sum signals which corresponds in sense of circular polarization to that of the transverse difference signal, and for shifting the directional pattern of said corresponding sum signal to the position of the directional pattern of said signal of the other sense of circular polarization; whereby said shifted sum signal pattern and said sum signal pattern of the other sense of circular polarization are readily boresignted by mechanical means.
Claim 3
Dependent Claim
163 words
Apparatus for controlling beam skew in a circularly polarized offset-fed parabolic reflector antenna comprising: monopulse feed and comparator means for receiving radiation from said parabolic reflector and for providing a right circular sum signal, a left circular sumg signal and a transverse difference signal of one direction of circular polarization; and skew adjustment means connected to said monopulse feed and comparator means for receiving said transverse difference signal and the one of the sum signals which corresponds in direction of circular polarization to that of the transverse difference signal, and for shifting said corresponding sum signal to the angular position of said signal of the other direction of circular polarization; whereby said shifted sum signal and said sum signal of the other direction of circular polarization are readily boresighted by mechanical means; wherein said skew adjustment means comprises a 15 db coupler means having a first output port coupled to a load and a second output port for providing said shifted sum signal.
Claim 4
Dependent Claim
163 words
Apparatus for controlling beam skew in a circularly polarized offset-fed parabolic reflector antenna comprising: monopulse feed and comparator means for receiving radiation from said parabolic reflector and for providing a right circular sum signal, a left circular sumg signal and a transverse difference signal of one direction of circular polarization; and skew adjustment means connected to said monopulse feed and comparator means for receiving said transverse difference signal and the one of the sum signals which corresponds in direction of circular polarization to that of the transverse difference signal, and for shifting said corresponding sum signal to the angular position of said signal of the other direction of circular polarization; whereby said shifted sum signal and said sum signal of the other direction of circular polarization are readily boresighted by mechanical means; wherein said skew adjustment means comprises a 15 db coupler means having a first output port coupled to a load and a second output port for providing said shifted sum signal.
Claim 5
Dependent Claim
24 words
Apparatus for controlling beam skew according to claim 2 wherein said transverse difference signal and its corresponding sum signal are of right circular polarization.
Claim 6
Dependent Claim
24 words
Apparatus for controlling beam skew according to claim 2 wherein said transverse difference signal and its corresponding sum signal are of left circular polarization.
Claim 7
Dependent Claim
66 words
Apparatus for controlling beam skew according to claim 1 wherein said monopulse fed and comparator means further produces a transverse difference signal of the other sense of circular polarization, a right circular longitudinaL difference signal and a left circular longitudinal difference signal, and wherein said skew adjustment means comprises means for shifting the directional pattern of said transverse difference signal of one sense of circular polarization.
Claim 8
Dependent Claim
60 words
Apparatus for controlling beam skew according to claim 5 wherein said skew adjustment means comprises a coupler means for coupling a fraction of said transverse difference signal of one sense of circular polarization into said corresponding sum signal and for coupling the same fraction of said corresponding sum signal into said transverse difference signal of one sense of circular polarization.
Claim 9
Dependent Claim
30 words
Apparatus for controlling beam skew according to claim 6 wherein said transverse difference signal of one sense of circular polarization and its corresponding sum signal are of right circular polarization.
Claim 10
Dependent Claim
30 words
Apparatus for controlling beam skew according to claim 6 wherein said transverse difference signal of one sense of circular polarization and its corresponding sum signal are of left circular polarization.
Claim 11
Independent Claim
131 words
A method for controlling beam skew in a monopulse antenna system comprising: receiving radiated signal of right and left circular polarization; producing a right circular sum signal, a left circular sum signal, and a transverse difference signal of one sense of circular polarization, each of said signals having a respective directional pattern; coupling a portion of said transverse difference signal into the one of the sum signals which corresponds in sense of circular polarization to that of the transverse difference signal, whereby the directional pattern of said corresponding sum signal is shifted to the position of the directional pattern of said sum signal of the other sense of circular polarization; and mechanically boresighting said sum signal whose pattern was shifted and said sum signal of the other sense of circular polarization.
Claim 12
Independent Claim
131 words
A method for controlling beam skew in a monopulse antenna system comprising: receiving radiated signal of right and left circular polarization; producing a right circular sum signal, a left circular sum signal, and a transverse difference signal of one sense of circular polarization, each of said signals having a respective directional pattern; coupling a portion of said transverse difference signal into the one of the sum signals which corresponds in sense of circular polarization to that of the transverse difference signal, whereby the directional pattern of said corresponding sum signal is shifted to the position of the directional pattern of said sum signal of the other sense of circular polarization; and mechanically boresighting said sum signal whose pattern was shifted and said sum signal of the other sense of circular polarization.
Claim 13
Dependent Claim
58 words
A method for controlling beam skew according to claim 9 wherein said coupling step further couples the same portion of said corresponding sum signal into said transverse difference signal, whereby the directional pattern of said transverse difference signal is shifted to the position of the directional pattern of said sum signal of the other sense of circular polarization.
References Cited (Backward Citations)
US3359555A
Cited
US3708794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |