A New Axial Mode Helix Antenna: The Archimedean Screw Antenna

A new form of the axial mode helix antenna has been developed: The Archimedean Screw Antenna. It provides more gain for length than does the wire helix and it does so with 3 dB gain bandwidths approaching 1.7 to 1, a 50-ohm feed point with DC grounding, and it eliminates the need for insulators. It is the screen compliment to the skeletal wire helix antenna. Several methods of fabrication are shown.