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UHF Quad-Trapezoid-Loop+2xBars
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).

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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.

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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. 12870 Visits.
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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
3D View


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Front View
[1 large square = 2.5 inches]


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Top View
[1 large square = 2.5 inches]


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
UHF Raw Gain = 6.6 to 9.4 dBi


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
UHF SWR (300-ohms) under 1.8


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
UHF Impedance


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 470 MHz


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 530 MHz


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 590 MHz


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 650 MHz


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 698 MHz


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 758 MHz


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Azimuthal Pattern at 806 MHz


Enlarge Microsoft Word Document 14
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DOC14
UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
4nec2 File


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UHF Quad-Trapezoid-Loop+2xBars (NO Refl)
Side View
[1 large square = 2.5 inches]


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
3D View


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Front View
[1 large square = 2.5 inches]


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Top View
[1 large square = 2.5 inches]


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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


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
UHF SWR (300-ohms) Under 2.8


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
UHF Impedance


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 470 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 530 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 590 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 650 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 698 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 758 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 806 MHz


Enlarge Microsoft Word Document 29
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DOC29
UHF Quad-Trapezoid-Loop+2xBar + 11RR
4nec2 File Contains Summary of Dimensions


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Side View
[1 large square = 2.5 inches]


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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


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Hi-VHF Raw Gain FWD = -1.9 to -6.9 to 0.6 dBi


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Hi-VHF SWR (300-ohms) = 40 to 2.8


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 174 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 198 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 11RR
Azimuthal Pattern at 216 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
3D View


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Front View
[1 large square = 2.5 inches]


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Top View
[1 large square = 2.5 inches]


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
UHF Raw Gain = 11.4 to 12.6 to 11.1 dBi
UHF F/B & F/R Ratio Minimum = 18.1 dB


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
UHF SWR (300-ohms) Under 2.5


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
UHF Impedance


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 470 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 530 MHz


Enlarge photo 45
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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 590 MHz


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46
UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 650 MHz


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47
UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 698 MHz


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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 758 MHz


Enlarge photo 49
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UHF Quad-Trapezoid-Loop+2xBar + 15RR
Azimuthal Pattern at 806 MHz


Enlarge Microsoft Word Document 50
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DOC50
UHF Quad-Trapezoid-Loop+2xBar + 15RR
4nec2 File


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51
UHF Quad-Trapezoid-Loop+2xBar + 15RR
Side View
[1 large square = 2.5 inches]


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