DocumentCode :
1040915
Title :
A Luneberg lens scanning system
Author :
Hollis, J.S. ; Long, M.W.
Author_Institution :
Georgia Inst. Tech., Atlanta, GA, USA
Volume :
5
Issue :
1
fYear :
1957
fDate :
1/1/1957 12:00:00 AM
Firstpage :
21
Lastpage :
25
Abstract :
A 16,000-mc scanner is described which scans a 
azimuth sector alternately with each of two beams at a rate of 17 scans per beam per second. The beams have half-power vertical and horizontal beamwidths of 
and 
respectively and are separated vertically by an angle of 
. Horizontal collimation of each beam is achieved by a geodesic analog of the two-dimensional Luneberg lens. The lenses feed a section of a semiparabolic cylinder for effecting vertical collimation. Feeding the lenses is a switching system, consisting of two four-way turnstile waveguide switches and a waveguide chopper switch, which gives a scan-time dead-time ratio of 8:1.
azimuth sector alternately with each of two beams at a rate of 17 scans per beam per second. The beams have half-power vertical and horizontal beamwidths of and respectively and are separated vertically by an angle of . Horizontal collimation of each beam is achieved by a geodesic analog of the two-dimensional Luneberg lens. The lenses feed a section of a semiparabolic cylinder for effecting vertical collimation. Feeding the lenses is a switching system, consisting of two four-way turnstile waveguide switches and a waveguide chopper switch, which gives a scan-time dead-time ratio of 8:1.Keywords :
Lens antennas; Azimuth; Dielectric losses; Feeds; Frequency; Lenses; Optical refraction; Optical variables control; Radar antennas; Refractive index; Switches;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IRE Transactions on
Publisher :
ieee
ISSN :
0096-1973
Type :
jour
DOI :
10.1109/TAP.1957.1144471
Filename :
1144471
Link To Document :
