Senin, 23 Agustus 2010

Antenna Yagi FM

Gambar 1 Antenna Yagi FM Frek. 88-108 MHz







Gambar 2 Rancangan Driven Elemen Yagi


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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