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UHF 15-El Double-Quad Yagi - OPT
UHF 15-Element "Double-Quad" Yagi (aka "Stacked Yagis with common Bi-Quad Driver") analyzed using 4nec2.

Similar to "DOPPELQUAD" 2-m & 70-cm narrowband Radio Amateur antennas from BAZ Spezialantennen:
http://www.spezialantennen.eu/amateurfunk/doppelquad-antenne/index.php
http://www.amateur-radio-antenna.com/amateurradio-antenna/double-quad-antenna/index.php
http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.spezialantennen.eu%2Famateurfunk%2Fdoppelquad-antenne%2Findex.php&act=url

I used nikiml's Python Scripts to Optimize a 4nec2 File constructed with fol. Constraints:
1) Active Element is a Bi-Quad with upper/lower sets of Yagi Directors (6 per set) plus
four Reflectors with the same X-Coordinate located BETWEEN the plane of the Directors.
[If allowed to extend BEYOND the plane, F/B, F/R & Gain may improve...analysis TBD.]
2) All Element locations symmetric above/below X-Y plane,
3) Inner Reflector's Z-Coordinate is 5% to 50% of upper/lower Z-Coordinate of Directors.
4) Outer Reflector's Z-Coordinate is 50% to 95% of upper/lower Z-Coordinate of Directors.
5) Range for Plane of Directors was very wide: between +/- 4-inches and +/- 24-inches from Center.

Optimized dimensions are found in the 4nec2 File.
Date(s): 23 Jun 2013. Album by holl_ands. 1 - 16 of 16 Total. 6486 Visits.
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UHF 15-El Double-Quad Yagi
3D View


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UHF 15-El Double-Quad Yagi
Front View
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UHF 15-El Double-Quad Yagi
Top View
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UHF 15-El Double-Quad Yagi
UHF Raw Gain 10.6 to 13.6 dBi
F/B & F/R Minimum = 17.1 dB


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UHF 15-El Double-Quad Yagi
UHF SWR (300-ohm) Under 2.9


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UHF 15-El Double-Quad Yagi
UHF Impedance


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 470 MHz


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 530 MHz


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 590 MHz


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 650 MHz


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 698 MHz


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 758 MHz


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UHF 15-El Double-Quad Yagi
Azimuthal Pattern at 806 MHz


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UHF 15-El Double-Quad Yagi
Side View
[1 large square = 2.5 inches]


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UHF 15-El Double-Quad Yagi
4nec2 File


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UHF 15-El Double-Quad Yagi
Contents of Python Control *.bat File


 
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