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 holl_ands | Home > Loop Antennas incl Folded Dipole > 
UHF Quadazoid Loop + Reflector
UHF Quadazoid Loop with Reflector analyzed using 4nec2 after determining "best"
Dimensions using nikiml's Python Optimizer Scripts.

Note that OPTimized Dimensions WITH Reflector are somewhat DIFFERENT than without.
Two different Reflector Types were analyzed:

#######################################
a) Screen Grid Reflector = 24"H x 16"W with Grid = 2"H x 4"W.

UHF Raw Gain = 9.8 to 10.4 to 9.8 dBi, F/B & F/R Gain Min. = 14.1 dB
and SWR (300-ohms) Under 1.3...with Beamwidth = 71 to 67-deg, decreasing with Freq.
So performance is very comparable to A-D C2.

#######################################
b) 11 Reflector Rods:

UHF Raw Gain = 10.0 to 11.0 to 10.2 dBi, F/B & F/R Gain Min. = 18.0 dB
and SWR (300-ohms) Under 2.2...with Beamwidth = 66 to 56-deg, decreasing with Freq..
Higher Gain is likely due to significantly Wider Reflector.
Date(s): 23 Mar 2018. Album by holl_ands. 1 - 42 of 42 Total. 720 Visits.
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Enlarge photo 1
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1
UHF Quadazoid Loop + 24"x16" Refl.
3D View
Refl.-to-Quadazoid Separation = 5.13-in


Enlarge photo 2
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2
UHF Quadazoid Loop + 24"x16" Refl.
Front View
[1 large square = 2.5-inches]


Enlarge photo 3
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3
UHF Quadazoid Loop + 24"x16" Refl.
Dimensions - JUST ACTIVE ELEMENTS
[1 large square = 2.5-inches]


Enlarge photo 4
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4
UHF Quadazoid Loop + 24"x16" Refl.
UHF Raw Gain = 9.8 to 10.4 to 9.8 dBi
UHF F/B & F/R Gain Min. = 14.1 dB


Enlarge photo 5
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5
UHF Quadazoid Loop + 24"x16" Refl.
UHF SWR (300-ohms) Under 1.3


Enlarge photo 6
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UHF Quadazoid Loop + 24"x16" Refl.
UHF Impedance


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UHF Quadazoid Loop + 24"x16" Refl.
Azimuthal Pattern at 470 MHz


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8
UHF Quadazoid Loop + 24"x16" Refl.
Azimuthal Pattern at 530 MHz


Enlarge photo 9
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9
UHF Quadazoid Loop + 24"x16" Refl.
Azimuthal Pattern at 590 MHz


Enlarge photo 10
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10
UHF Quadazoid Loop + 24"x16" Refl.
Azimuthal Pattern at 650 MHz


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11
UHF Quadazoid Loop + 24"x16" Refl.
Azimuthal Pattern at 698 MHz


Enlarge photo 12
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12
UHF Quadazoid Loop + 24"x16" Refl.
Azimuthal Pattern at 806 MHz


Enlarge photo 13
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13
UHF Quadazoid Loop + 24"x16" Refl.
Elevation Pattern at 470 MHz


Enlarge photo 14
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14
UHF Quadazoid Loop + 24"x16" Refl.
Elevation Pattern at 530 MHz


Enlarge photo 15
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15
UHF Quadazoid Loop + 24"x16" Refl.
Elevation Pattern at 590 MHz


Enlarge photo 16
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16
UHF Quadazoid Loop + 24"x16" Refl.
Elevation Pattern at 650 MHz


Enlarge photo 17
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17
UHF Quadazoid Loop + 24"x16" Refl.
Elevation Pattern at 698 MHz


Enlarge photo 18
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18
UHF Quadazoid Loop + 24"x16" Refl.
Elevation Pattern at 806 MHz


Enlarge Microsoft Word Document 19
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DOC19
UHF Quadazoid Loop + 24"x16" Refl.
4nec2 Text File, includes Dimensions


Enlarge Microsoft Word Document 20
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DOC20
UHF Quadazoid Loop + 24"x16" Refl.
EVAL Performance Results Text File


Enlarge HTML Document 21
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HTML21
UHF Quadazoid Loop + 24"x16" Refl.
EVAL Performance Summary *.html File


Enlarge photo 22
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22
UHF Quadazoid Loop + 11RR's
3D View
Refl.-to-Quadazoid Separation = 3.54-in


Enlarge photo 23
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23
UHF Quadazoid Loop + 11RR's
Front View
[1 large square = 2.5-inches]


Enlarge photo 24
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24
UHF Quadazoid Loop + 11RR's
Top View
[1 large square = 2.5-inches]


Enlarge photo 25
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25
UHF Quadazoid Loop + 11RR's
UHF Raw Gain = 10.0 to 11.0 to 10.2 dBi
UHF F/B & F/R Gain Min. = 18.0 dB


Enlarge photo 26
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26
UHF Quadazoid Loop + 11RR's
UHF SWR (300-ohms) Under 2.2


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27
UHF Quadazoid Loop + 11RR's

Enlarge photo 28
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28
UHF Quadazoid Loop + 11RR's
Azimuthal Pattern at 470 MHz


Enlarge photo 29
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29
UHF Quadazoid Loop + 11RR's
Azimuthal Pattern at 530 MHz


Enlarge photo 30
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30
UHF Quadazoid Loop + 11RR's
Azimuthal Pattern at 590 MHz


Enlarge photo 31
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31
UHF Quadazoid Loop + 11RR's
Azimuthal Pattern at 650 MHz


Enlarge photo 32
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32
UHF Quadazoid Loop + 11RR's
Azimuthal Pattern at 698 MHz


Enlarge photo 33
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33
UHF Quadazoid Loop + 11RR's
Azimuthal Pattern at 806 MHz


Enlarge photo 34
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34
UHF Quadazoid Loop + 11RR's
Elevation Pattern at 470 MHz


Enlarge photo 35
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35
UHF Quadazoid Loop + 11RR's
Elevation Pattern at 530 MHz


Enlarge photo 36
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36
UHF Quadazoid Loop + 11RR's
Elevation Pattern at 590 MHz


Enlarge photo 37
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37
UHF Quadazoid Loop + 11RR's
Elevation Pattern at 650 MHz


Enlarge photo 38
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38
UHF Quadazoid Loop + 11RR's
Elevation Pattern at 698 MHz


Enlarge photo 39
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39
UHF Quadazoid Loop + 11RR's
Elevation Pattern at 806 MHz


Enlarge Microsoft Word Document 40
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DOC40
UHF Quadazoid Loop + 11RR's
4nec2 Text File, includes Dimensions


Enlarge Microsoft Word Document 41
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DOC41
UHF Quadazoid Loop + 11RR's
EVAL Performance Results Text File


Enlarge HTML Document 42
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HTML42
UHF Quadazoid Loop + 11RR's
EVAL Performance Summary *.html File


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