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 holl_ands | Home > Loop Antennas incl Folded Dipole > 
UHF Quad-Trapezoid-Loop
UHF Quad-Trapezoid-Loop Antenna analyzed using 4nec2, formed by adding outer parts
of Chireix 2-Square to an Hourglass-Loop.  All dimensions determined using nikiml's
Optimization Scripts.

Three versions analyzed: Quad-Trap (NO Reflector), Quad-Trap (11 RR) and Quad-Trap (15 RR).

=================================================
a) Quad-Trapezoid-Loop (NO Refl): AWG10 Elements.

UHF Raw Gain = 6.7 to 8.4 to 7.8 dBi and SWR (300-ohms) under 1.8.
Note Very Wide 70-60 degree Beamwidth.

=================================================
b) Quad-Trapezoid-Loop + 11 Reflector Rods: AWG10 Elements and 1/4-in O.D. Reflector Rods.

UHF Raw Gain = 9.7 to 11.6 dBi, F/B & F/R Ratio Min. = 19.9 dB and SWR (300-ohms) Under 1.9.
BEAMWIDTH is 60 to 50 degrees across  UHF Band with a VERY DEEP Notch directly to the Rear.

=================================================
c) Quad-Trapezoid-Loop + 15 Reflector Rods: AWG10 Elements and 1/4-in O.D. Reflector Rods.

UHF Raw Gain = 10.1 to 11.8 dBi, F/B & F/R Ratio Min =19.2 dB and SWR (300-ohms) under 2.7.
Note VERY WIDE BEAMWIDTH, 60-degrees ALL across the UHF Band and the VERY DEEP
Notch directly to the Rear.

EDIT (7Mar2015): Added 11RR version.
Date(s): 11 Jul 2014. Album by holl_ands. 1 - 51 of 51 Total. 12893 Visits.
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Enlarge photo 1
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1
UHF Quad-Trapezoid-Loop
3D View


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

Balun (4:1 300-to-75-ohm Transformer)
connects in place of Red Circle in Middle.

Note 1/4-in GAP at Top and Bottom.


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3
UHF Quad-Trapezoid-Loop (NO Refl)
Top View
[1 large square = 2.5 inches]


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4
UHF Quad-Trapezoid-Loop (NO Refl)
UHF Raw Gain = 6.7 to 8.4 to 7.8 dBi


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5
UHF Quad-Trapezoid-Loop (NO Refl)
UHF SWR (300-ohms) under 1.8


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UHF Quad-Trapezoid-Loop (NO Refl)
UHF Impedance


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


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8
UHF Quad-Trapezoid-Loop (NO Refl)
Azimuthal Pattern at 530 MHz


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9
UHF Quad-Trapezoid-Loop (NO Refl)
Azimuthal Pattern at 590 MHz


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10
UHF Quad-Trapezoid-Loop (NO Refl)
Azimuthal Pattern at 650 MHz


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11
UHF Quad-Trapezoid-Loop (NO Refl)
Azimuthal Pattern at 698 MHz


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12
UHF Quad-Trapezoid-Loop (NO Refl)
Azimuthal Pattern at 758 MHz


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13
UHF Quad-Trapezoid-Loop (NO Refl)
Azimuthal Pattern at 806 MHz


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


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15
UHF Quad-Trapezoid-Loop (NO Refl)
Side View
[1 large square = 2.5 inches]


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16
UHF Quad-Trapezoid-Loop + 11RR
3D View


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


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


Enlarge photo 19
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19
UHF Quad-Trapezoid-Loop + 11RR
UHF Raw Gain = 9.7 to 11.6 dBi
UHF F/B & F/R Ratio Min. = 19.9 dB


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20
UHF Quad-Trapezoid-Loop + 11RR
UHF SWR (300-ohms) Under 1.9


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21
UHF Quad-Trapezoid-Loop + 11RR
UHF Impedance


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22
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 470 MHz


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23
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 530 MHz


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24
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 590 MHz


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25
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 650 MHz


Enlarge photo 26
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26
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 698 MHz


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27
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 758 MHz


Enlarge photo 28
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28
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 806 MHz


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


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30
UHF Quad-Trapezoid-Loop + 11RR
Side View
[1 large square = 2.5 inches]


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31
UHF Quad-Trapezoid-Loop + 11RR
Hi-VHF Raw Gain TO REAR = 5.0 to 5.1 dBi
Hi-VHF F/B & F/R Ratio = 3.8 to 14.2 dB
MORE GAIN TO REAR


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32
UHF Quad-Trapezoid-Loop + 11RR
UHF Raw Gain FORWARD = 1.3 to -10.0 dBi


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33
UHF Quad-Trapezoid-Loop + 11RR
Hi-VHF SWR (300-ohms) = 167 to 9.4
is Excessive


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34
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 174 MHz
More Gain to REAR


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35
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 198 MHz
More Gain to REAR


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36
UHF Quad-Trapezoid-Loop + 11RR
Azimuthal Pattern at 216 MHz
More Gain to REAR


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37
UHF Quad-Trapezoid-Loop + 15RR
3D View


Enlarge photo 38
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38
UHF Quad-Trapezoid-Loop + 15RR
Front View
[1 large square = 2.5 inches]


Enlarge photo 39
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39
UHF Quad-Trapezoid-Loop + 15RR
Top View
[1 large square = 2.5 inches]


Enlarge photo 40
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40
UHF Quad-Trapezoid-Loop + 15RR
UHF Raw Gain = 10.1 to 11.8 dBi
UHF F/B & F/R Ratio Minimum = 19.2 dB


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41
UHF Quad-Trapezoid-Loop + 15RR
UHF SWR (300-ohms) under 2.7


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42
UHF Quad-Trapezoid-Loop + 15RR
UHF Impedance


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


Enlarge photo 44
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44
UHF Quad-Trapezoid-Loop + 15RR
Azimuthal Pattern at 530 MHz


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


Enlarge photo 46
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46
UHF Quad-Trapezoid-Loop + 15RR
Azimuthal Pattern at 650 MHz


Enlarge photo 47
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47
UHF Quad-Trapezoid-Loop + 15RR
Azimuthal Pattern at 698 MHz


Enlarge photo 48
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48
UHF Quad-Trapezoid-Loop + 15RR
Azimuthal Pattern at 758 MHz


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


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


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


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