UHF Batwing Antenna with No Reflector and 16"H x 12"W Screen Grid Reflector analyzed using 4nec2. Based on 4nec2 files provided by user <300ohm>.
a) UHF Batwing - No Reflector UHF Raw Gain = 4.6 to 5.6 to 5.1 dBi and SWR (300-ohms) under 2.1 Raw Gain is FLAT to within +/- 0.5 dB with Excellent SWR.
b) UHF Batwing + 16-in H x 12-in W Screen Grid Reflector at 5-in Separation UHF Raw Gain = 8.9 to 9.2 to 7.3 dBi, F/B & F/R Ratio Min = 12.4 dB and SWR (300-ohms) under 2.8. Raw Gain drops off about 2 dB on higher frequencies with minimally acceptable SWR. F/B & F/R Ratios should improve with somewhat larger Reflector and 1-in vice 2-in Spacings between Horizontal Wires.
Date(s): 16 Oct 2014. Album by holl_ands. 1 - 26 of 26 Total. 8739 Visits.
enlarge 65KB, 676x1024 1 UHF Batwing - No Reflector 3D View
enlarge 299KB, 1017x1024 2 UHF Batwing - No Reflector Front View [1 large square = 1.25 inches]