Communications: radio wave antennas – Antennas – Antenna with parasitic reflector
Patent
1997-10-30
2000-10-24
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Antenna with parasitic reflector
343779, 343840, H01Q 1516, H01Q 1912
Patent
active
061374512
ABSTRACT:
An antenna system has a reflector illuminated by a primary feed for producing a primary beam. The reflector is illuminated further by a secondary feed formed of an array of secondary feed elements of which the respective electromagnetic signals are adjustable in terms of their relative amplitudes and phases to produce a secondary beam with sidelobes oriented in directions away from the directions of the primary beam. Spacing among feed elements of the secondary feed array is selected for further control of orientation of sidelobes of the secondary beam. Highest efficiency is attained for signals of the primary feed by configuring the reflector for forming the primary beam, while the secondary beam is produced with lower efficiency but with isolation from the primary beam. The surface of the reflector is contoured to provide maximum primary-beam efficiency and minimal primary-beam sidelobes in the direction of the secondary beam.
REFERENCES:
patent: 3435453 (1969-03-01), Howard
patent: 3534365 (1970-10-01), Korvin et al.
patent: 3569976 (1971-03-01), Korvin et al.
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patent: 4647938 (1987-03-01), Roederer et al.
patent: 5202700 (1993-04-01), Miller
patent: 5546097 (1996-08-01), Ramanujam et al.
patent: 5576721 (1996-11-01), Hwang et al.
patent: 5581265 (1996-12-01), Stirland et al.
Durvasula Bhaskar
Smith Terry M.
Space Systems Loral, Inc.
Wimer Michael C.
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