UHF Circularly Polarized 5-Blade Fan analyzed using 4nec2. Based design on NomDePlume's for 1280 MHz Remote Piloted Vehicle (RPV) Band, which I rescaled for UHF Band, see: http://www.rcgroups.com/forums/showthread.php?t=1389925&page=30
Three versions are presented here, the first a direct Rescale, the second Re-Optimized to emphasize Horizontal Gain and better SWR with 75-ohm Load and the third an improved Re-Optimization with wider variable SYmbol search ranges which provided additional SWR improvement at the expense of reduced Horizontal Gain.
Date(s): 29 Aug 2014. Album by holl_ands. 1 - 48 of 48 Total. 5040 Visits.
enlarge 96KB, 1024x898 1 UHF Cir-Pol 5-Blade Fan 3D View
enlarge 176KB, 1152x561 2 UHF Cir-Pol 5-Blade Fan Front View [1 large square = 1.25 inches]
enlarge 301KB, 1024x980 3 UHF Cir-Pol 5-Blade Fan Top View [1 large square = 1.25 inches]
enlarge 168KB, 1024x690 4 UHF Cir-Pol 5-Blade Fan UHF Raw Gain = 1.5 to 0.2 dBi Azimuth = 45-deg shown, all nearly same
enlarge 180KB, 1024x690 5 UHF Cir-Pol 5-Blade Fan UHF SWR (75-ohms) = 8.5 to 1.5 to 5.7
enlarge 213KB, 1024x690 6 UHF Cir-Pol 5-Blade Fan UHF Impedance
enlarge 320KB, 1024x1024 7 UHF Cir-Pol 5-Blade Fan Azimuthal Pattern at 470 MHz Horizontal is much less than Vertical Gain
enlarge 331KB, 1024x1024 8 UHF Cir-Pol 5-Blade Fan Azimuthal Pattern at 590 MHz Horizontal is much less than Vertical Gain
enlarge 330KB, 1024x1024 9 UHF Cir-Pol 5-Blade Fan Azimuthal Pattern at 698 MHz Horizontal is much less than Vertical Gain
enlarge 310KB, 1024x1024 10 UHF Cir-Pol 5-Blade Fan Circular Polarization at 470 MHz LHCP is much less than RHCP Gain
enlarge 313KB, 1024x1024 11 UHF Cir-Pol 5-Blade Fan Circular Polarization at 590 MHz LHCP is much less than RHCP Gain
enlarge 313KB, 1024x1024 12 UHF Cir-Pol 5-Blade Fan Circular Polarization at 698 MHz LHCP is much less than RHCP Gain
enlarge 123KB, 1024x894 13 UHF Cir-Pol 5-Blade Fan Horizontal Gain at 584 MHz Horizontal is much less than Vertical Gain
enlarge 121KB, 1024x896 14 UHF Cir-Pol 5-Blade Fan Vertical Gain at 584 MHz Horizontal is much less than Vertical Gain
enlarge 117KB, 1024x891 15 UHF Cir-Pol 5-Blade Fan Total Gain at 584 MHz
enlarge 117KB, 1024x883 16 UHF Cir-Pol 5-Blade Fan RHCP Gain at 584 MHz LHCP is much less than RHCP Gain
enlarge 126KB, 1024x905 17 UHF Cir-Pol 5-Blade Fan LHCP Gain at 584 MHz LHCP is much less than RHCP Gain
enlarge 33KB, 791x1024 18 UHF Cir-Pol 5-Blade Fan 4nec2 File
enlarge 91KB, 1152x672 19 UHF Cir-Pol 5-Blade Fan - OPT 3D View
enlarge 131KB, 1152x400 20 UHF Cir-Pol 5-Blade Fan - OPT Front View [1 large square = 1.25 inches]
enlarge 296KB, 1010x1024 21 UHF Cir-Pol 5-Blade Fan - OPT Top View [1 large square = 1.25 inches]
enlarge 166KB, 1024x690 22 UHF Cir-Pol 5-Blade Fan - OPT UHF Raw Gain = 1.2 to 0.2 dBi Azimuth = 45-deg shown, all nearly same
enlarge 187KB, 1024x690 23 UHF Cir-Pol 5-Blade Fan - OPT UHF SWR (75-ohms) Under 3.5 and Under 2.7 above 500 MHz
