Horizontally Stack of Free-Form 4-Bay Bowties (2xFF4) with Double Angled Reflectors (DAR) analyzed by 4nec2 when Angled Against a Metal Wall.
Three Versions Analyzed:
For fol. Side-By-Side alternatives, cut off 2-in Grid on OUTER (only) side of EACH Reflector and Bay-to-Bay-Separation = 34.821-in (Reflectors one continous piece) to fit 66-in wide Metal panel.
a) Two Side-By-Side FF4's (DAR=36x34 each), Lossless RF Combiner Mod, to see what is possible:
UHF Raw Gain = 17.3 to 19.3 Along 105-deg Azimuth, F/B & F/R Ratio Min = 15.8 dB and SWR (300-ohms) under 2.2.
b) Two Side-By-Side FF4's (DAR=36x34 each), HHH (Hollands Horizontal Harness): T.B.D.
For fol. Echelon alternatives, cut off 2-in Grid on either side of EACH Reflector and Bay-to-Bay-Separation = 32.5-in to fit 66-in wide Metal panel with no "shading" of one antenna by the other. Note model rotated CCW 15-deg so Pattern points along X-Axis:
c) Two Echelon FF4's (DAR=36x32 each), HHH (Hollands Horizontal Harness):
UHF Raw Gain = 16.6 to 16.4 to 18.3 dBi, F/B & F/R Min = 12.8 dB and SWR (300-ohms) under 2.6.
Date(s): 9 Aug 2014. Album by holl_ands. 1 - 36 of 36 Total. 1961 Visits.
enlarge 292KB, 947x1024 1 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees 3D View
enlarge 361KB, 1152x673 2 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Front View [1 large square = 12.5 inches]
enlarge 106KB, 347x1024 3 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Top View [1 large square = 12.5 inches]
enlarge 414KB, 1011x1024 4 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees 3D View DETAIL Each 48"Hx36"W DAR has 2" Cut Off the OUTER Edge, So Each is 48"Hx34"W with NO Spacing Between. Can fabricate from continuous piece of Wire Grid.
enlarge 506KB, 1011x1024 5 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Front View DETAIL [1 large square = 5 inches]
If additional Door Opening Clearance is needed, can eliminate 4" Grid in MIDDLE.
enlarge 147KB, 444x1024 6 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Top View [1 large square = 5 inches]
Bowties extend 22.25-in from Wall. Antenna-to-Wall Separation = 1-in Door Opening Clearance only 1.5-in.
enlarge 188KB, 1024x690 7 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees UHF Raw Gain = 17.3 to 19.3 Along 105-deg Azimuth UHF F/B & F/R Ratio Minimum = 15.8 dB
enlarge 175KB, 1024x690 8 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees UHF SWR (300-ohms) Under 2.2
enlarge 196KB, 494x1024 18 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Side View [1 large square = 5 inches]
enlarge 215KB, 1024x742 19 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees - Echelon + HHH Alternative 3D View
enlarge 357KB, 1152x673 20 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Front View - Echelon + HHH Alternative [1 large square = 12.5 inches]
enlarge 141KB, 450x1024 21 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Top View - Echelon + HHH Alternative [1 large square = 12.5 inches]
enlarge 236KB, 1011x1024 22 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees - Echelon + HHH Alternative 3D View DETAIL
enlarge 512KB, 1011x1024 23 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Front View DETAIL - Echelon + HHH Alternative [1 large square = 5 inches]
enlarge 188KB, 552x1024 24 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Top View DETAIL - Echelon + HHH Alternative [1 large square = 5 inches]
Bowties extend 13.25-in from Wall. Antenna-to-Wall Separation = 1-in Door Opening Clearance = 3.25-in.
enlarge 181KB, 1024x690 25 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees - Echelon + HHH Alternative UHF Raw Gain = 16.6 to 16.4 to 18.3 dBi UHF F/B & F/R Minimum = 12.8 dB
enlarge 189KB, 1024x690 26 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees - Echelon + HHH Alternative UHF SWR (300-ohms) Under 2.6
enlarge 224KB, 1024x690 27 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees - Echelon + HHH Alternative UHF Impedance
enlarge 302KB, 1024x1024 28 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 470 MHz
enlarge 299KB, 1024x1024 29 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 530 MHz
enlarge 302KB, 1024x1024 30 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 590 MHz
enlarge 302KB, 1024x1024 31 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 650 MHz
enlarge 301KB, 1024x1024 32 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 698 MHz
enlarge 319KB, 1024x1024 33 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 758 MHz
enlarge 303KB, 1024x1024 34 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative Azimuthal Pattern at 806 MHz
enlarge 670KB, 791x1024 35 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Echelon + HHH Alternative 4nec2 File
enlarge 364KB, 774x1024 36 Horiz-Stack FF4+DAR Angled Against Wall Offset 15-degrees Side View - Echelon + HHH Alternative [1 large square = 5 inches]
