FM Right Circular Folded Dipole Pair analyzed using 4nec2. The Folded Dipole Pair was based on K6STI's circdip3.nec Dipole Pair file found in C:/4nec2/models/VHFsimple.
K6STI's original file was modified to add the Elements completing two Crossed Folded Dipoles and was Resized for the FM Band, with final adjustment so that the Circular Polarization was in the FORWARD direction at 98 MHz (and REVERSE direction at 97 MHz).
EDIT (16Jan2012): Added Circular Polarization Azimuthal Charts. It's Right Hand Circular FORWARD and Left Hand Circular to REVERSE, so carefully inspect antenna to verify direction. LHCP Suppression is reduced on low freqs.
2 Jan201221 items6289 visitsAlbum by holl_ands
enlarge 46KB, 1024x937 1 FM Right Circular Folded Dipole Pair 3D View
enlarge 236KB, 1024x841 2 FM Right Circular Folded Dipole Pair Front View [1 big box = 5-inches]
enlarge 53KB, 184x1024 3 FM Right Circular Folded Dipole Pair Side View [1 big box = 5-inches]
enlarge 146KB, 1152x584 4 FM Right Circular Folded Dipole Pair FM TOTAL Raw Gain FORWARD (90-deg)
enlarge 151KB, 1152x584 5 FM Right Circular Folded Dipole Pair FM TOTAL Raw Gain to SIDE (0-deg)
enlarge 194KB, 1152x584 6 FM Right Circular Folded Dipole Pair FM SWR Under 1.7
enlarge 147KB, 1152x584 7 FM Right Circular Folded Dipole Pair FM Impedance
enlarge 28KB, 791x1024 8 FM Right Circular Folded Dipole Pair 4nec2 File
enlarge 50KB, 153x1024 9 FM Right Circular Folded Dipole Pair Top View [1 big box = 5-inches]
enlarge 335KB, 1024x1024 10 FM Right Circular Folded Dipole Pair Azimuthal Pattern at 87 MHz Horizontal Polarization Gain Higher than Vertical Polarization Gain, except to SIDES.
enlarge 334KB, 1024x1024 11 FM Right Circular Folded Dipole Pair Azimuthal Pattern at 91 MHz
enlarge 328KB, 1024x1024 12 FM Right Circular Folded Dipole Pair Azimuthal Pattern at 97 MHz REVERSE: Horizontal Polarization Gain = Vertical Polarization Gain.
enlarge 329KB, 1024x1024 13 FM Right Circular Folded Dipole Pair Azimuthal Pattern at 98 MHz FORWARD: Horizontal Polarization Gain = Vertical Polarization Gain.
enlarge 332KB, 1024x1024 14 FM Right Circular Folded Dipole Pair Azimuthal Pattern at 103 MHz Horizontal Polarization Gain Less than Vertical Polarization Gain.
enlarge 329KB, 1024x1024 15 FM Right Circular Folded Dipole Pair Azimuthal Pattern at 108 MHz Horizontal Polarization Gain Less than Vertical Polarization Gain.
enlarge 331KB, 1024x1024 16 FM Right Circular Folded Dipole Pair Circular Polarization Patterns at 87 MHz
Right Hand FORWARD & Left Hand to REVERSE
enlarge 326KB, 1024x1024 17 FM Right Circular Folded Dipole Pair Circular Polarization Patterns at 91 MHz
Right Hand FORWARD & Left Hand to REVERSE
enlarge 326KB, 1024x1024 18 FM Right Circular Folded Dipole Pair Circular Polarization Patterns at 98 MHz
Right Hand FORWARD & Left Hand to REVERSE
enlarge 339KB, 1024x1024 19 FM Right Circular Folded Dipole Pair Circular Polarization Patterns at 103 MHz
Right Hand FORWARD & Left Hand to REVERSE
enlarge 343KB, 1024x1024 20 FM Right Circular Folded Dipole Pair Circular Polarization Patterns at 108 MHz
Right Hand FORWARD & Left Hand to REVERSE
enlarge 273KB, 1024x1024 21 FM Right Circular Folded Dipole Pair Circular Polarization Patterns - Ani-Gif
