perhitungan antenna helical 24ghz

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 (harus antara 0.75-1.33 Lambda)



G (Ground Plane Diameter) 0.1300 meter 1.0560 Lambda (harus antara 0.8-1.1 Lambda)



Slambda 0.2653 Clambda (harus antara 0.2126-0.2867 Clambda)

Lilitan Gain dBi Beam (deg) L (m)




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.








referensi :