THE BACKFIRE BIFILAR HELICAL ANTENNA Open PDF Document Details Document Type Technical Report Publication Date Sep 01, 1962 Accession Number AD0289084 Entities People Willard Thomas Patton Organizations University of Illinois Urbana–Champaign Tags Communities of Interest Advanced Electronics Air Platforms Weapons Technologies DTIC Thesaurus Topics Air Force Aircrafts Antenna Radiation Patterns Antennas Equations Far Field Frequency Helical Antennas Measurement Near Field Numerical Analysis Phase Measurement Polarization Radiation Radiation Patterns Standing Waves Transmission Lines