A backfire helical feed |
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| Authors: | Johnson R Cotton R |
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| Affiliation: | Georgia Institute of Technology, Atlanta, GA, USA; |
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| Abstract: | A novel backfire helical feed for a paraboloidal reflector is described. The antenna requirements were a 20 percent bandwidth atL- 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 a1frac{5}{8}-in rigid coaxial transmission line. The50 Omegatransmission 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. |
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