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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. 32904 Visits.
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Enlarge photo 1
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1
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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2
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]


Enlarge Microsoft Word Document 3
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DOC3
UHF Solid Triangle Bowtie
4nec2 File


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4
UHF Solid Triangle Bowtie
UHF Raw Gain = 3.4 - 6.3 dBi


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5
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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9
UHF Solid Triangle Bowtie
Hi-VHF Impedance


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10
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]


Enlarge Microsoft Word Document 12
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DOC12
UHF Six-Whisker Tri-Conn Bowtie
4nec2 File


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13
UHF Six-Whisker Tri-Conn Bowtie
UHF Raw Gain = 3.1-5.1 dBi


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14
UHF Six-Whisker Tri-Conn Bowtie
UHF SWR (300-ohms) Under 2.0


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15
UHF Six-Whisker Tri-Conn Bowtie
UHF Impedance


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16
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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19
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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22
UHF Six-Whisker Tri-Conn Bowtie
Hi-VHF Raw Gain = 1.9-2.0 dBi


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23
UHF Six-Whisker Tri-Conn Bowtie
Hi-VHF SWR (300-ohms) = 15.4 to 7.7


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24
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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26
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


Enlarge photo 28
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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]


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


Enlarge Microsoft Word Document 30
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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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33
UHF Six-Whisker Bowtie
UHF Impedance


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34
UHF Six-Whisker Bowtie
Total, Horizontal and Vertical Patterns at 470 MHz


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35
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


Enlarge photo 37
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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


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


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


Enlarge photo 42
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42
UHF Six-Whisker Bowtie
Hi-VHF Impedance


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


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


Enlarge photo 45
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45
UHF Six-Whisker Bowtie
Hi-VHF Pattern at 216 MHz


Enlarge photo 46
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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.


Enlarge photo 47
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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]


Enlarge Microsoft Word Document 48
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DOC48
UHF Four-Whisker Bowtie - 4nec2 File

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49
UHF Four-Whisker Bowtie
UHF Raw Gain = 3.2-5.3 dBi


Enlarge photo 50
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50
UHF Four-Whisker Bowtie
UHF SWR (300-ohm) under 3.0


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51
UHF Four-Whisker Bowtie
UHF Impedance


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52
UHF Four-Whisker Bowtie
Hi-VHF Raw Gain = 1.9-2.0 dBi


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


Enlarge photo 54
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54
UHF Four-Whisker Bowtie
Hi-VHF Impedance


Enlarge photo 55
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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


Enlarge photo 57
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57
UHF Four-Whisker Bowtie
Azimuthal Pattern at 216 MHz


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


Enlarge photo 59
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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]


Enlarge Microsoft Word Document 60
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DOC60
UHF Enclosed Bowtie - 4nec2 File

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61
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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63
UHF Enclosed Bowtie
UHF Impedance


Enlarge photo 64
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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.


Enlarge photo 65
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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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67
UHF Indented Bowtie
UHF Raw Gain = 3.6-5.5 dBi


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68
UHF Indented Bowtie
UHF SWR (300-ohm) under 4.2


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69
UHF Indented Bowtie
UHF Impedance


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