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Perhitungan antenna helical 2.4

Perhitungan Antenna Helical 2.4GHz
Oleh: Onno W. Purbo YC1DAV
Frekuensi 2.437 Ghz
Diameter Pipa (Dlambda) 0.042 meter
Diameter Ground Plane 0.130 meter
Slambda 0.035 meter
Panjang Gelombang (Lambda) 0.1231 meter
Clambda 0.1319 meter 1.0718 Lambda (hrs antara 0.75-1.33 Lambda)
G (Ground Plane Diameter) 0.1300 meter 1.0560 Lambda (hrs antara 0.8-1.1 Lambda)
Slambda 0.2653 Clambda (hrs antara 0.2126-0.2867 Clambda)

Lilitan Gain Beam L (m)
dBi (deg)
1 6.64 94.2 0.04
2 9.65 66.6 0.07
3 11.41 54.4 0.11
4 12.66 47.1 0.14
5 13.63 42.1 0.18
6 14.42 38.5 0.21
7 15.09 35.6 0.25
8 15.67 33.3 0.28
9 16.18 31.4 0.32
10 16.64 29.8 0.35
11 17.05 28.4 0.39
12 17.43 27.2 0.42
13 17.78 26.1 0.46
14 18.10 25.2 0.49
15 18.40 24.3 0.53
16 18.68 23.5 0.56
17 18.94 22.8 0.60
18 19.19 22.2 0.63
19 19.43 21.6 0.67
20 19.65 21.1 0.70
Matching impedance perlu di buat karena impedansi antenna helical 150 ohm, sedang coax 50 ohm.
Matching impedance dibuat dari panel / lempengan metal.