UHF Quad-Trapezoid-Loop + 2 Bar Elements analyzed using 4nec2. Formed by adding outer parts of Chireix 2-Square Antenna to an Hourglass-Loop. All dimensions determined using nikiml's Optimization Scripts. Picture posted by schoolbus: http://www.digitalhome.ca/forum/186-antenna-research-development/157816-urban-commando-uhf-loop-substitution-6.html#post2287090
Two versions analyzed: Quad-Trap+2xBars (NO Reflector) and Quad-Trap+2xBars (15 RR).
================================================= a) Quad-Trapezoid-Loop+2xBars (NO Refl): AWG10 Elements.
UHF Raw Gain = 6.6 to 9.4 dBi, SWR (300-ohms) under 1.8 and Beamwidth = 80 to 50-degrees.
================================================= b) Quad-Trapezoid-Loop+2xBars + 11 Reflector Rods: AWG10 Elements and 1/4-in O.D. Reflector Rods.
UHF Raw Gain = 11.2 to 12.6 to 11.5 dBi, F/B & F/R Ratio Min. = 17.8 dB and SWR (300-ohms) Under 2.8. Beamwidth = 60 to 50 degrees. Hi-VHF Raw Gain FWD = -1.9 to -6.9 to 0.6 dBi and Hi-VHF Raw Gain TO REAR = 6.0 to 1.2 dBi with F/B & F/R Ratio = 7.9 to 12.7 to 0.6 dB and SWR (300-ohms) = 40 to 2.8.
================================================= c) Quad-Trapezoid-Loop+2xBars + 15 Reflector Rods: AWG10 Elements and 1/4-in O.D. Reflector Rods.
UHF Raw Gain = 11.4 to 12.6 to 11.1 dBi, F/B & F/R Ratio Min = 18.1 dB and SWR (300-ohms) under 2.5. Note 60-50 degree Beamwidth and EXTREMELY DEEP 64+ dB Notch directly to Rear.
Date(s): 11 Jul 2014. Album by holl_ands. 1 - 51 of 51 Total. 13832 Visits.
enlarge 69KB, 687x1024 1 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) 3D View
enlarge 223KB, 733x1024 2 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Front View [1 large square = 2.5 inches]
enlarge 94KB, 402x1024 3 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Top View [1 large square = 2.5 inches]
enlarge 166KB, 1024x675 4 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) UHF Raw Gain = 6.6 to 9.4 dBi
enlarge 193KB, 1024x675 5 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) UHF SWR (300-ohms) under 1.8
enlarge 219KB, 1024x675 6 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) UHF Impedance
enlarge 317KB, 1024x1024 7 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 470 MHz
enlarge 317KB, 1024x1024 8 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 530 MHz
enlarge 317KB, 1024x1024 9 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 590 MHz
enlarge 313KB, 1024x1024 10 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 650 MHz
enlarge 317KB, 1024x1024 11 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 698 MHz
enlarge 313KB, 1024x1024 12 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 758 MHz
enlarge 286KB, 1024x1024 13 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Azimuthal Pattern at 806 MHz
enlarge 27KB, 791x1024 14 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) 4nec2 File
enlarge 78KB, 283x1024 15 UHF Quad-Trapezoid-Loop+2xBars (NO Refl) Side View [1 large square = 2.5 inches]
enlarge 125KB, 659x1024 16 UHF Quad-Trapezoid-Loop+2xBar + 11RR 3D View
enlarge 268KB, 761x1024 17 UHF Quad-Trapezoid-Loop+2xBar + 11RR Front View [1 large square = 2.5 inches]
enlarge 135KB, 506x1024 18 UHF Quad-Trapezoid-Loop+2xBar + 11RR Top View [1 large square = 2.5 inches]
enlarge 187KB, 1024x741 19 UHF Quad-Trapezoid-Loop+2xBar + 11RR UHF Raw Gain = 11.2 to 12.6 to 11.5 dBi UHF F/B & F/R Ratio Min. = 17.8 dB
enlarge 121KB, 378x1024 30 UHF Quad-Trapezoid-Loop+2xBar + 11RR Side View [1 large square = 2.5 inches]
enlarge 170KB, 1024x741 31 UHF Quad-Trapezoid-Loop+2xBar + 11RR Hi-VHF Raw Gain = 6.0 to 1.2 dBi Hi-VHF F/B & F/R Ratio = 7.9 to 12.7 to 0.6 dB MORE GAIN TO REAR
enlarge 157KB, 1024x741 32 UHF Quad-Trapezoid-Loop+2xBar + 11RR Hi-VHF Raw Gain FWD = -1.9 to -6.9 to 0.6 dBi