DocumentCode :
1028511
Title :
A backfire helical feed
Author :
Johnson, Richard C. ; Cotton, Rickey B.
Author_Institution :
Georgia Institute of Technology, Atlanta, GA, USA
Volume :
32
Issue :
10
fYear :
1984
fDate :
10/1/1984 12:00:00 AM
Firstpage :
1126
Lastpage :
1128
Abstract :
A novel backfire helical feed for a paraboloidal reflector is described. The antenna requirements were a 20 percent bandwidth at 
- band, right-hand circular polarization, a maximum voltage standing-wave ratio (VSWR) of 2.0, and a peak power capability of 200 kW unpressurized. The feed consists basically of a 3.5-turn helix wound around a 
-in rigid coaxial transmission line. The 
transmission line is coupled to the helix through a two-stage transformer within the coax followed by a half-wave coax to two-wire (unequal diameters) balun.
- band, right-hand circular polarization, a maximum voltage standing-wave ratio (VSWR) of 2.0, and a peak power capability of 200 kW unpressurized. The feed consists basically of a 3.5-turn helix wound around a -in rigid coaxial transmission line. The transmission line is coupled to the helix through a two-stage transformer within the coax followed by a half-wave coax to two-wire (unequal diameters) balun.Keywords :
Backfire antennas; Helical antennas; Parabolic reflector antennas; Reflector antenna feeds; Reflector antennas, parabolic; Bandwidth; Coaxial components; Couplings; Feeds; Helical antennas; Impedance matching; Polarization; Power transmission lines; Voltage; Wounds;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1984.1143217
Filename :
1143217
Link To Document :
