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UHF Batwing - No Refl & Screen Grid Refl
UHF Batwing Antenna with No Reflector and 16"H x 12"W Screen Grid Reflector analyzed using 4nec2.
Based on 4nec2 files provided by user <300ohm>.

a) UHF Batwing - No Reflector
UHF Raw Gain = 4.6 to 5.6 to 5.1 dBi and SWR (300-ohms) under 2.1
Raw Gain is FLAT to within +/- 0.5 dB with Excellent SWR.

b) UHF Batwing + 16-in H x 12-in W Screen Grid Reflector at 5-in Separation
UHF Raw Gain = 8.9 to 9.2 to 7.3 dBi, F/B & F/R Ratio Min = 12.4 dB and SWR (300-ohms) under 2.8.
Raw Gain drops off about 2 dB on higher frequencies with minimally acceptable SWR.
F/B & F/R Ratios should improve with somewhat larger Reflector and 1-in vice 2-in Spacings
between Horizontal Wires.
Date(s): 16 Oct 2014. Album by holl_ands. 1 - 26 of 26 Total. 9249 Visits.
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Enlarge photo 1
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1
UHF Batwing - No Reflector
3D View


Enlarge photo 2
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2
UHF Batwing - No Reflector
Front View
[1 large square = 1.25 inches]


Enlarge Microsoft Word Document 3
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DOC3
UHF Batwing - No Reflector
4nec2 File


Enlarge photo 4
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4
UHF Batwing - No Reflector
UHF Raw Gain = 4.6 to 5.6 to 5.1 dBi


Enlarge photo 5
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5
UHF Batwing - No Reflector
UHF SWR (300-ohms) Under 2.1


Enlarge photo 6
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6
UHF Batwing - No Reflector
UHF Impedance


Enlarge photo 7
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7
UHF Batwing - No Reflector
Azimuthal Pattern at 470 MHz


Enlarge photo 8
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8
UHF Batwing - No Reflector
Azimuthal Pattern at 530 MHz


Enlarge photo 9
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9
UHF Batwing - No Reflector
Azimuthal Pattern at 590 MHz


Enlarge photo 10
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10
UHF Batwing - No Reflector
Azimuthal Pattern at 650 MHz


Enlarge photo 11
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11
UHF Batwing - No Reflector
Azimuthal Pattern at 698 MHz


Enlarge photo 12
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12
UHF Batwing - No Reflector
Azimuthal Pattern at 806 MHz


Enlarge photo 13
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13
UHF Batwing + Screen Grid Reflector
3D View


Enlarge photo 14
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14
UHF Batwing + Screen Grid Reflector
Front View
[1 large square = 1.25 inches]


Enlarge Microsoft Word Document 15
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DOC15
UHF Batwing + Screen Grid Reflector
4nec2 File


Enlarge photo 16
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16
UHF Batwing + Screen Grid Reflector
UHF Raw Gain = 8.9 to 9.2 to 7.3 dBi
UHF F/B & F/R Ratio Minimum = 12.4 dB


Enlarge photo 17
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17
UHF Batwing + Screen Grid Reflector
UHF SWR (300-ohms) Under 2.8


Enlarge photo 18
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18
UHF Batwing + Screen Grid Reflector
UHF Impedance


Enlarge photo 19
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19
UHF Batwing + Screen Grid Reflector
Azimuthal Pattern at 470 MHz


Enlarge photo 20
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20
UHF Batwing + Screen Grid Reflector
Azimuthal Pattern at 530 MHz


Enlarge photo 21
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21
UHF Batwing + Screen Grid Reflector
Azimuthal Pattern at 590 MHz


Enlarge photo 22
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22
UHF Batwing + Screen Grid Reflector
Azimuthal Pattern at 650 MHz


Enlarge photo 23
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23
UHF Batwing + Screen Grid Reflector
Azimuthal Pattern at 698 MHz


Enlarge photo 24
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24
UHF Batwing + Screen Grid Reflector
Azimuthal Pattern at 806 MHz


Enlarge photo 25
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25
UHF Batwing + Screen Grid Reflector
Top View
Batwing to Screen Grid = 5-in
[1 large square = 1.25 inches]


Enlarge photo 26
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26
UHF Batwing + Screen Grid Reflector
Side View
Batwing to Screen Grid = 5-in
[1 large square = 1.25 inches]


 
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