US4376940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna arrangements for suppressing selected sidelobes
Assignee: AT&T Inc
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Filing: 1980-10-29
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Granted: 1983-03-15
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Expires: 2000-10-29
Abstract
Abstract The present invention relates to wideband antenna arrangements for suppressing selected sidelobes comprising a main antenna (10) comprising a predetermined aperture (l) and two sidelobe suppression means (12, 14, 40, 42) disposed adjacent and on symmetrically opposite sides of the main antenna in the plane of the sidelobes to be suppressed. The distance between the suppression means preferably approximates the width of the aperture of the main antenna and the aperture size of the suppression means controls the sidelobe suppression region at the aperture of the main antenna. The suppression means can comprise two auxiliary antennas or two sections of the main antenna focusing reflector having apertures (l 1 ) which are smaller than that of the main antenna.
Inventors
- 👤 Hotze Miedema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:16
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/12; H01Q21/00; H01Q21/29
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
An antenna arrangement capable of suppressing selected sidelobes, the antenna arrangement comprising: a main antenna (10) comprising a main focusing reflector including a predetermined aperture (l) and a feed arrangement disposed to radiate a first beam of electromagnetic energy when emitted therefrom along a feed axis of the main antenna for reflection by the main focusing reflector toward the aperture thereof with a predetermined amplitude distribution thereacross characterized in that the antenna arrangement further comprises: first and second suppression means (12, 14, 40 and 42) disposed adjacent to and on symmetrically opposite sides of the main focusing reflector in the plane of the sidelobes to be suppressed with a distance therebetween that approximates the width of the aperture of the main focusing reflector, the first and second suppression means being capable of directing second and third beams, respectively, of electromagnetic energy in the direction of the first beam with a radiation pattern which comprises an amplitude and periodicity which corresponds to, and a phase opposite to, the selected sidelobes to be suppressed.
Claim 2
Dependent Claim
172 words
An antenna arrangement capable of suppressing selected sidelobes, the antenna arrangement comprising: a main antenna (10) comprising a main focusing reflector including a predetermined aperture (l) and a feed arrangement disposed to radiate a first beam of electromagnetic energy when emitted therefrom along a feed axis of the main antenna for reflection by the main focusing reflector toward the aperture thereof with a predetermined amplitude distribution thereacross characterized in that the antenna arrangement further comprises: first and second suppression means (12, 14, 40 and 42) disposed adjacent to and on symmetrically opposite sides of the main focusing reflector in the plane of the sidelobes to be suppressed with a distance therebetween that approximates the width of the aperture of the main focusing reflector, the first and second suppression means being capable of directing second and third beams, respectively, of electromagnetic energy in the direction of the first beam with a radiation pattern which comprises an amplitude and periodicity which corresponds to, and a phase opposite to, the selected sidelobes to be suppressed.
Claim 3
Dependent Claim
67 words
An antenna arrangement according to claim 1 characterized in that the first and second suppression means comprises a first and a second auxiliary antenna (10, 12), respectively, each auxiliary antenna comprising a focusing reflector including a predetermined aperture (l 1 ) which is smaller than the aperture of the main focusing reflector, and a feed arrangement capable of providing a predetermined amplitude distribution across the aperture thereof.
Claim 4
Dependent Claim
124 words
An antenna arrangement according to claim 2 characterized in that the antenna arrangement further comprises: coupling means (16 or 18) disposed in an input transmission element to the feed arrangement of the main antenna capable of coupling a predetermined portion of a signal propagating in said transmission element for delivery to the first and second auxiliary antennas; and means (24, 26 or 25, 27 and 28) coupled between said coupling means and the first and second auxiliary antennas capable of introducing a predetermined phase relationship between a first and a second signal being delivered to the first and the second auxiliary antennas, respectively, which phase relationship is dependent on the predetermined amplitude distribution being provided across the apertures of the main and auxiliary antennas.
Claim 5
Dependent Claim
53 words
An antenna arrangement according to claim 3 characterized in that in response to a uniform amplitude distribution being applied across the aperture of the main and first and second auxiliary antennas, said phase relationship introducing means introduces a 180 degree phase difference between the signals applied to the first and second auxiliary antennas.
Claim 6
Dependent Claim
52 words
An antenna arrangement according to claim 3 characterized in that in response to a cosine amplitude distribution being applied across the apertures of the main and first and second auxiliary antennas, said phase relationship introducing means maintains the same phase relationship between the signals applied to the first and second auxiliary antennas.
Claim 7
Dependent Claim
134 words
An antenna arrangement according to claim 1 characterized in that the first and second suppression means comprise a first and a second section (40, 42) of the main focusing reflector, respectively, symmetrically located and including opposite edges of each main focusing reflector, each section including a predetermined aperture (l 1 ) and being displaced by a predetermined distance (d) from the extension of the reflecting surface of said main focusing reflector in a predetermined separate direction parallel to a boresight axis of the main antenna for directly intercepting a portion of the first beam radiated by the feed arrangement of the main antenna and forming said second and third beams, respectively, said direction of displacement for each section being dependent on the predetermined amplitude distribution being applied across the aperture of the main antenna.
Claim 8
Dependent Claim
45 words
An antenna arrangement according to claim 6 characterized in that in response to a uniform amplitude distribution being applied across the aperture of the main antenna, said first and second sections of the main focusing reflector are displaced in opposite directions by said predetermined distance.
Claim 9
Dependent Claim
46 words
An antenna arrangement according to claim 6 characterized in that in response to a cosine amplitude distribution being applied across the aperture of the main antenna, said first and second sections of the main focusing reflector are displaced in the same direction by said predetermined distance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |