Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1980-11-17
1982-09-07
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343854, H01Q 326
Patent
active
043486789
ABSTRACT:
A radio frequency energy antenna system for directing a collimated beam of radio frequency energy in free space over relatively wide scan angles. The antenna system includes a plurality of antenna elements disposed along a curved path for producing a directed, noncollimated beam of radio frequency energy and a radio frequency lens disposed between the antenna elements and free space for collimating the radio frequency energy in the directed, noncollimated beam to produce the collimated beam of radio frequency energy in free space. The arrangement of the antenna elements along a curved path produces an amplitude distribution across the collimated beam wavefront which is substantially uniform. A second radio frequency lens has a plurality of array ports coupled to the plurality of antenna elements and a plurality of feed ports, each one being associated with a corresponding collimated beam of radio frequency energy in free space. With such lens the antenna has a relatively wide operating bandwidth. The disposition of the antenna elements along the curved path enables the second lens to be smaller in size and have a shape wherein the array ports and feed ports face one another to a greater degree than if the antenna elements were disposed along a straight line thereby improving the operating effectiveness of the second lens.
REFERENCES:
patent: 3170158 (1965-02-01), Rotman
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patent: 3245081 (1966-04-01), McFarland
patent: 3568207 (1971-03-01), Boyns et al.
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patent: 3852761 (1974-12-01), Bogner
patent: 4070678 (1978-01-01), Smedes
patent: 4080605 (1978-03-01), Hilton
Wide Angle Limited Scan Array Antenna Tech. Study--Tong et al., Raytheon Co., AD-780-048, Note Particularly pg. 4.
Lieberman Eli
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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