Cara perhitungan pembuatan antenna yagi FM 88-108 MHz
Details:
· Reflector = 1,03 x Driven
· Driven = 1/2 Lamda
· D1 (direction) = 0,94 x Driven
· D2 (direction) = 0,99 x D1
· D3 (direction) = 0,99 x D2
· D4 (direction) = 0,99 x D3
· .....
· gamma match/road = 0,15 x Driven (PGR)
· gamma road to driven element = 0,25x Driven (JGR)
Examples
If our radio transmitter working at 100 MHz frequency, so
The Lambda ( l )=> Lambda l = C/f ; C = 3 x108 m/s ray velocity, f = frequency Hz
l = (3 x 108)/100x106
= 3 m
Driven = (1/2)x 3 m
= 1,5 m
Reflector = 1,03 x 1,5
= 1,545 m
D1= 0,94xDriven
= 0,9 x 1,5m
= 1,35m
D2= 0,99 xD1
= 0,99 x 1,35m
=1,3365 m
D3 = 0,99x D2
= 0,99 x 1,3365m
= 1,323135 m
D4 = 0,99 x D3
= 1,30990365 m
Gamma road = 0,15 x Driven
= 0,15 x 1,5m
= 0,225 m
Gamma road to driven element = 0,025 x Driven
= 0,025 x 1,5m
= 0,0375 m
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Sumber : http://esbiwan.blogspot.com/2010/08/antenna-yagi-fm.html