Communications: radio wave antennas – Antennas – Plural diverse-type antennas using same active element
Patent
1977-06-06
1978-06-13
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural diverse-type antennas using same active element
343840, 343895, H01Q 1912, H01Q 136
Patent
active
040952304
ABSTRACT:
A high accuracy broadband antenna system is disclosed. This system is a dual mode system which includes a parabolic reflector dish having a dielectric substrate and a conductive material coating on the substrate; an antenna feed positioned at the focus of the paraboloid and directed at the reflector dish for providing a narrow beam monopulse radiation pattern; and a circuit for coupling energy to and/or from the antenna feed. The conductive material coating on the reflector dish substrate defines a plurality of conductive spiral arms for providing a wide beam monopulse radiation pattern; and the antenna system further includes structure defining a cavity for backing the conductive spiral arms and a circuit for coupling energy to and/or from the conductive spiral arms, whereby the parabolic reflector dish is operable as a primary antenna providing a wide beam radiation pattern.
The dual mode antenna system is included in a missile guidance system, wherein the wide beam radiation pattern may be used for initial target acquisition, and the narrow beam radiation pattern may be used for tracking the target very accurately. This broadband antenna system is operable over a greater-than-9:1 bandwidth frequency range.
REFERENCES:
patent: 3445850 (1969-05-01), Stegen
patent: 3550135 (1970-12-01), Bodmer
patent: 4015264 (1977-03-01), Koerner
Auletti Ronald L.
Salmond William E.
Callan Edward W.
General Dynamics Corporation
Johnson Edward B.
Lieberman Eli
Martin Neil F.
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