Communications: radio wave antennas – Antennas – Plural diverse-type antennas using same active element
Patent
1979-06-25
1982-09-07
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Plural diverse-type antennas using same active element
343798, 343840, H01Q 100
Patent
active
043486770
ABSTRACT:
The disclosed common aperture seeker antenna includes a parabolic array of crossed dipoles. This array is substantially reflective for radiated electrical signals in one band, and substantially transmissive for radiated electrical signals outside of that band. A monopulse (four-element) waveguide feed is rigidly positioned on the concave side of the parabolic array at the focal point thereof. The parabolic reflector antenna operates in the one band to provide a high gain active system for accurate tracking of targets. A planar spiral antenna is rigidly positioned on the convex side of the parabolic array in axial alignment with the parabolic reflector antenna. This wideband antenna operates over a multioctave frequency band below that of the one band to provide a low gain system for passive tracking of targets. The two antenna systems coexist in such a manner that each utilizes the available aperture to its fullest extent.
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Blum Theodore M.
Callan Edward W.
General Dynamics Pomona Division
Johnson Edward B.
Martin Neil F.
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