US4255753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna construction for reducing side lobes of the radiation pattern
Assignee: Lockheed Martin Corp
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Filing: 1979-06-27
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Granted: 1981-03-10
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Expires: 1999-06-27
Abstract
Abstract A construction for reducing the side lobe energy emitted from antennas, particularly horn antennas, and thereby attenuating unwanted coupling with adjacent antennas, the construction utilizes a continuous helical coil located on the interior surface of the antenna horn in order to progressively delay the current flowing along the horn wall by causing the current to follow a longer path than that portion of the wave which propagates well away from the wall, the number of coil turns being selected to cause the portion of the E plane which arrives at the horn aperture to be out of phase by approximately one-half wave length with the portion of the E plane propagated away from the horn wall so that it will cancel the E plane energy at the aperture.
Inventors
- 👤 Edward Lovick, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:24
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/0208
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
An antenna construction for reducing the side lobes of a radiation pattern comprising: a wave guide; an antenna horn connected with said wave guide and having a horn wall arranged at an angle to the axis of said wave guide; said antenna radiating an energy in an E plane; a helical coil of wire secured to the interior surface of said horn wall and having substantially the same shape as said wall; the diameter of said wire and the number of coil turns along said horn wall being such as to delay the portion of the E plane at the aperture of said antenna horn sufficiently to make said delayed portion out of phase with the E plane portion propagated away from said horn wall.
Claim 2
Dependent Claim
125 words
An antenna construction for reducing the side lobes of a radiation pattern comprising: a wave guide; an antenna horn connected with said wave guide and having a horn wall arranged at an angle to the axis of said wave guide; said antenna radiating an energy in an E plane; a helical coil of wire secured to the interior surface of said horn wall and having substantially the same shape as said wall; the diameter of said wire and the number of coil turns along said horn wall being such as to delay the portion of the E plane at the aperture of said antenna horn sufficiently to make said delayed portion out of phase with the E plane portion propagated away from said horn wall.
Claim 3
Dependent Claim
33 words
An antenna construction as defined in claim 1 wherein; said coil is secured to said horn by fillets on each side of said wire to provide a smooth transition to said delayed portion.
Claim 4
Dependent Claim
37 words
An antenna construction as defined in claim 2 wherein; said helical coil provides at least six turn perturbations along said horn wall per wave length of the propagated E. plane in order to provide said smooth transition.
Claim 5
Dependent Claim
28 words
An antenna construction as defined in claim 3 wherein; said fillets comprise solder which is radiused from approximately the center diameter of said wire to the horn wall.
Claim 6
Dependent Claim
55 words
An antenna construction as defined in claim 4 wherein the diameter of said wire is determined by the formula ##EQU7## wherein `L` is the length of the horn, `λ` is the wave length, `φ` is the divergent angle of the horn wall from the axis, and "n" is the number of turns per wave length.
References Cited (Backward Citations)
SU237934A1
Cited
US3732571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |