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 holl_ands | Home > Bowties, Dipoles, Batwings & Rhombics > 
UHF Bowties - NO Reflector
Five UHF Bowtie variations (with NO Reflectors) analyzed using 4nec2.  ALL except Solid Triangle are AWG10.

Solid Triangle Bowtie:         UHF Raw Gain = 3.4 - 6.3 dBi and SWR (300-ohms) under 2.6 [EXCL].
Six-Whisker Tricon Bowtie: UHF Raw Gain = 3.1 - 5.1 dBi and SWR (300-ohms) under 2.0 [EXCL].
Six-Whisker Bowtie:           UHF Raw Gain = 3.4 - 5.0 dBi and SWR (300-ohms) under 2.4 [EXCL].
Four-Whisker Bowtie:         UHF Raw Gain = 3.2 - 5.3 dBi and SWR (300-ohms) under 3.0 [FAIR].
Enclosed Bowtie:               UHF Raw Gain = 3.8 - 5.4 dBi and SWR (300-ohms) under 3.3 [FAIR].
Indented Bowtie:               UHF Raw Gain = 3.6 - 5.5 dBi and SWR (300-ohms) under 4.2 [POOR].

Highest Raw Gain was provided by optimized Solid Triangle, about 1 dB higher on highest freqs.
Flattest Gain was (tie) 6-Whisker & Enclosed Bowtie, latter had Highest Gain on Low Channels.

Optimum dimensions determined by nikiml's Optimization Scripts were Hypotenuse=9.75-in,
Tip-to-Tip Vertical Separation=12-in and Feedline Separation=1.0-in.  Hi-VHF analysis is also provided.

Six-Whisker had better SWR (300-ohms) than Four-Whisker version.
Tine Separation is measured between upper and lower Whisker Tips.
Quasi-optimum 6-Whisker sizes for ALL AWG10 wire sizes:
All BowLength=10-in, TineSeparation=5-in and Feedline Separation=1.5in.
Total WIDTH is 21.5-in, which is a ONE-Wavelength at 549 MHz (middle of the band).
Contrast this to a Dipole which has minimum SWR of about 75-ohms closer to a HALF-Wavelength.

All models had AGT=1.0 (no Gain correction) with No Warnings or Errors, except for 6-Whisker Bowtie:
4nec2's Automatic Gain Test (AGT) would not go below 0.41 dB (UHF) and 0.29 dB (Hi-VHF).
Subtract these corrections from 6-Whisker 4nec2 Gain results below.
The 6-Whisker Tri-Conn Bowtie did NOT require any AGT corrections.

EDIT (7Sep2011): Added 4-Whisker, Enclosed and Indented Bowties.

EDIT (20Jun2013): Added Solid Triangle Bowtie using 33-Wire Model using nikiml's Optimization Scripts.
See CM4251 Parabolic+2-Bay+Grid-Reflector analysis for alternative 265-Wire Model.

EDIT (18Jul2014): Added 6-Whisker Bowtie with Tri-Conn (Triple Connector) between Whiskers and the Balun Feedpoint.  AGT is much easier to adjust.
Date(s): 20 Apr 2010. Album by holl_ands. 1 - 69 of 69 Total. 34997 Visits.
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UHF Solid Triangle Bowtie - 3D View
Hypotenuse=9.75-in, Tip Vertical Separation=12-in
and Feedline Separation=1.0-in.

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UHF Solid Triangle Bowtie - Front View
Hypotenuse=9.75-in, Tip Vertical Separation=12-in
and Feedline Separation=1.0-in.
[1 large box = 1.25 inches]

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DOC3
UHF Solid Triangle Bowtie
4nec2 File

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UHF Solid Triangle Bowtie
UHF Raw Gain = 3.4 - 6.3 dBi

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UHF Solid Triangle Bowtie
UHF SWR (300-ohms) Under 2.6

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UHF Solid Triangle Bowtie
UHF Impedance

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UHF Solid Triangle Bowtie
Hi-VHF Raw Gain = 2.0 dBi

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UHF Solid Triangle Bowtie
Hi-VHF SWR (300-ohms) is Excessive

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UHF Solid Triangle Bowtie
Hi-VHF Impedance

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UHF Six-Whisker Tri-Conn Bowtie - Front View
All Whiskers=10-in, Tine Separation=5-in
and Feedline Separation=1.5-in.
[1 small box = 0.5-in]

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11
UHF Six-Whisker Tri-Conn Bowtie - Top View
All Whiskers=10-in.
Feedline Separation=1.5-in.
[1 small box = 0.5-in]

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DOC12
UHF Six-Whisker Tri-Conn Bowtie
4nec2 File

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UHF Six-Whisker Tri-Conn Bowtie
UHF Raw Gain = 3.1-5.1 dBi

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UHF Six-Whisker Tri-Conn Bowtie
UHF SWR (300-ohms) Under 2.0

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UHF Six-Whisker Tri-Conn Bowtie
UHF Impedance

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UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 470 MHz

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17
UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 530 MHz

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18
UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 590 MHz

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UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 650 MHz

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20
UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 698 MHz

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21
UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 806 MHz

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UHF Six-Whisker Tri-Conn Bowtie
Hi-VHF Raw Gain = 1.9-2.0 dBi

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UHF Six-Whisker Tri-Conn Bowtie
Hi-VHF SWR (300-ohms) = 15.4 to 7.7

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UHF Six-Whisker Tri-Conn Bowtie
Hi-VHF Impedance

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25
UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 174 MHz

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UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 198 MHz

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27
UHF Six-Whisker Tri-Conn Bowtie
Azimuthal Pattern at 216 MHz

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28
UHF Six-Whisker Bowtie - Front View
All Whiskers=10-in, Tine Separation=5-in
and Feedline Separation=1.5-in.
[1 small box = 0.5-in]

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29
UHF Six-Whisker Bowtie - Top View
[1 small box = 0.5-in]

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DOC30
UHF Six-Whisker Bowtie
4nec2 File

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31
UHF Six-Whisker Bowtie
UHF Raw Gain = 3.4-5.0 dBi
[After AGT Gain Corrections]
[Applied to above Chart]

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32
UHF Six-Whisker Bowtie
UHF SWR (300-ohm) under 2.4

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UHF Six-Whisker Bowtie
UHF Impedance

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UHF Six-Whisker Bowtie
Total, Horizontal and Vertical Patterns at 470 MHz

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UHF Six-Whisker Bowtie
Total, Horizontal and Vertical Patterns at 590 MHz

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36
UHF Six-Whisker Bowtie
Total, Horizontal and Vertical Patterns at 698 MHz

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37
UHF Six-Whisker Bowtie
3D Total Gain Pattern at 590 MHz

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38
UHF Six-Whisker Bowtie
3D Horizontal Gain Pattern at 590 MHz

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39
UHF Six-Whisker Bowtie
3D Vertical Gain Pattern at 590 MHz

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40
UHF Six-Whisker Bowtie
Hi-VHF Raw Gain = 1.8-2.9 dBi
[After AGT Gain Corrections]

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41
UHF Six-Whisker Bowtie
Hi-VHF SWR (300-ohms) is EXCESSIVE

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42
UHF Six-Whisker Bowtie
Hi-VHF Impedance

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43
UHF Six-Whisker Bowtie
Hi-VHF Pattern at 174 MHz

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44
UHF Six-Whisker Bowtie
Hi-VHF Pattern at 198 MHz

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UHF Six-Whisker Bowtie
Hi-VHF Pattern at 216 MHz

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46
UHF Four-Whisker Bowtie - 3D View
All Whiskers=10-in, Tine Separation=5-in
and Feedline Separation=1.5-in.

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47
UHF Four-Whisker Bowtie - Front View
All Whiskers=10-in, Tine Separation=5-in
and Feedline Separation=1.5-in.
[1 small box = 0.5-in]

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DOC48
UHF Four-Whisker Bowtie - 4nec2 File

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UHF Four-Whisker Bowtie
UHF Raw Gain = 3.2-5.3 dBi

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UHF Four-Whisker Bowtie
UHF SWR (300-ohm) under 3.0

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UHF Four-Whisker Bowtie
UHF Impedance

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UHF Four-Whisker Bowtie
Hi-VHF Raw Gain = 1.9-2.0 dBi

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53
UHF Four-Whisker Bowtie
Hi-VHF SWR (300-ohm) is Excessive

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54
UHF Four-Whisker Bowtie
Hi-VHF Impedance

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55
UHF Four-Whisker Bowtie
Azimuthal Pattern at 174 MHz

Enlarge photo 56
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56
UHF Four-Whisker Bowtie
Azimuthal Pattern at 198 MHz

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57
UHF Four-Whisker Bowtie
Azimuthal Pattern at 216 MHz

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58
UHF Enclosed Bowtie - 3D View
All Whiskers=10-in, Tine Separation=5-in
and Feedline Separation=1.5-in.

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59
UHF Enclosed Bowtie - Front View
All Whiskers=10-in, Tine Separation=5-in
and Feedline Separation=1.5-in.
[1 small box = 0.5-inch]

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DOC60
UHF Enclosed Bowtie - 4nec2 File

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UHF Enclosed Bowtie
UHF Raw Gain = 3.8-5.4 dBi

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UHF Enclosed Bowtie
UHF SWR (300-ohm) under 3.3

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UHF Enclosed Bowtie
UHF Impedance

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64
UHF Indented Bowtie - 3D View
All Whiskers=10-in AWG10, Tine Separation=5-in,
Indent=1.7 and Feedline Separation=1.5-in.

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65
UHF Indented Bowtie - 3D View
All Whiskers=10-in AWG10, Tine Separation=5-in,
Indent=1.7 and Feedline Separation=1.5-in.
[1 small box = 0.5-inch]

Enlarge Microsoft Word Document 66
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DOC66
UHF Indented Bowtie - 4nec2 File

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UHF Indented Bowtie
UHF Raw Gain = 3.6-5.5 dBi

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UHF Indented Bowtie
UHF SWR (300-ohm) under 4.2

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UHF Indented Bowtie
UHF Impedance

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