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Config nr. |
Dipole length
(λ) |
Lateral
spacing (λ) |
FB spacing (λ) |
Dipole
thickness (λ/d) |
|
Main beams -
gain (dB) |
Main beams
-width (°) |
Main beams
-angle (°) |
Front-to-Back
ratio |
1st side-lobe
down from main (dB) |
Other
side/rear lobes minimum down from main (dB) |
Total number
of lobes |
|
|
|
|
|
1 |
1 |
0.5 |
0.25 |
95 |
|
13.97 |
12 |
24 |
10.6 |
11.02 |
10.64 |
10 |
|
|
|
|
|
2 |
0.9 |
0.5 |
0.25 |
95 |
|
13.36 |
12 |
24 |
9.82 |
11.26 |
9.82 |
10 |
|
|
|
|
|
3 |
0.85 |
0.5 |
0.25 |
95 |
|
13.08 |
12 |
24 |
9.42 |
11.55 |
9.42 |
10 |
|
|
|
|
|
4 |
1 |
0.55 |
0.25 |
95 |
|
14.76 |
10 |
20 |
12.4 |
10.68 |
12.42 |
14 |
|
|
|
|
|
5 |
0.9 |
0.55 |
0.25 |
95 |
|
14.13 |
10 |
20 |
11.5 |
11.05 |
11.52 |
14 |
|
|
|
|
|
6 |
0.85 |
0.55 |
0.25 |
95 |
|
13.84 |
10 |
20 |
11.1 |
11.01 |
11.09 |
14 |
|
|
|
|
|
7 |
1 |
0.6 |
0.25 |
95 |
|
15.24 |
10 |
20 |
14.3 |
11.5 |
14.22 |
14 |
|
|
|
|
|
8 |
0.9 |
0.6 |
0.25 |
95 |
|
14.62 |
10 |
20 |
13.3 |
11.36 |
13.62 |
14 |
|
|
|
|
|
9 |
0.85 |
0.6 |
0.25 |
95 |
|
14.33 |
10 |
20 |
12.8 |
11.46 |
12.78 |
14 |
|
|
|
|
|
10 |
1 |
0.5 |
0.35 |
95 |
|
14.01 |
12 |
24 |
40.9 |
9.8 |
20.51 |
12 |
|
|
|
|
|
11 |
0.9 |
0.5 |
0.35 |
95 |
|
13.34 |
12 |
24 |
21.1 |
10.2 |
20.21 |
10 |
|
|
|
|
|
12 |
0.85 |
0.5 |
0.35 |
95 |
|
13.02 |
12 |
24 |
26.9 |
10.34 |
20.24 |
10 |
|
|
|
|
|
13 |
1 |
0.55 |
0.35 |
95 |
|
14.77 |
10 |
20 |
23.6 |
9.57 |
23.44 |
14 |
|
|
|
|
|
14 |
0.9 |
0.55 |
0.35 |
95 |
|
14.07 |
10 |
20 |
28.2 |
9.77 |
24.13 |
16 |
|
|
|
|
|
15 |
0.85 |
0.55 |
0.35 |
95 |
|
13.75 |
10 |
20 |
32.3 |
9.89 |
23.81 |
16 |
|
|
|
|
|
16 |
1 |
0.6 |
0.35 |
95 |
|
15.18 |
10 |
20 |
19 |
10.19 |
13.79 |
14 |
|
|
|
|
|
17 |
0.9 |
0.6 |
0.35 |
95 |
|
14.51 |
10 |
20 |
21.1 |
10.36 |
13.93 |
14 |
|
|
|
|
|
18 |
0.85 |
0.6 |
0.35 |
95 |
|
14.2 |
10 |
20 |
22.5 |
10.46 |
13.94 |
14 |
|
|
|
|
|
19 |
1 |
0.5 |
0.25 |
10000 |
|
14.21 |
12 |
20 |
17.7 |
9.58 |
17.64 |
10 |
|
|
|
|
|
20 |
1 |
0.6 |
0.25 |
10000 |
|
15.12 |
10 |
20 |
20.7 |
9.79 |
13.78 |
14 |
|
|
|
|
|
21 |
0.85 |
0.5 |
0.25 |
10000 |
|
13.35 |
12 |
20 |
16.5 |
10.02 |
16.17 |
10 |
|
|
|
|
|
22 |
0.85 |
0.6 |
0.25 |
10000 |
|
14.27 |
10 |
20 |
19.3 |
9.93 |
13.91 |
14 |
|
|
|
|
|
23 |
1 |
0.5 |
0.35 |
10000 |
|
14 |
12 |
20 |
14.2 |
8.56 |
14.21 |
10 |
|
|
|
|
|
24 |
1 |
0.6 |
0.35 |
10000 |
|
14.84 |
10 |
20 |
12.9 |
9.04 |
12.62 |
14 |
|
|
|
|
|
25 |
0.85 |
0.5 |
0.35 |
10000 |
|
13.1 |
12 |
20 |
15.1 |
12.9 |
15.13 |
10 |
|
|
|
|
|
26 |
0.85 |
0.6 |
0.35 |
10000 |
|
13.97 |
10 |
20 |
13.5 |
9.14 |
12.76 |
14 |
|
|
|
|
|
General conclusions: |
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|
1) |
When the dipole
length is decreased, gain of the main beams decreases (not desirable), the
front-to-back ratio decreases (not desirable), and the strength of the first
left & right side-lobe increases relative to the two main beams (not
desirable) |
|
|
|
|
2) |
The gain of the two main beams is relatively
insensitive to spacing between the front dipoles and the reflector dipoles. |
|
|
|
|
|
3) |
The strength of
the first side-lobes left & right of the two main beams, is relatively
insensitive to the variation of the parameters. The relative strength is -9
to -12 dB. |
|
|
|
|
4) |
The strength of
the other side- and rear-lobes is sensitive to spacing between the front
dipoles and the reflector dipoles, and to the dipole diameter. |
|
|
|
|
5) |
Side/rear-lobes other than 1st, down from main:
decreases with decrease in dipole diameter |
|
|
|
|
|
|
|
6) |
The width of the two main beams is relatively
insensitive to array dimensions, other than the number of dipoles. The
beam-width is 10°-12°. |
|
|
|
7) |
The angle between the two main beams is
relatively insensitive to array dimensions, other than the number of
dipoles. The angle is 20°-24°. |
|
|
|
8) |
The total number
of pattern-lobes increases when lateral spacing between the dipoles is
increased. For the evaluated configurations, this even number varies from 10
to 16. |
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