Yagi Antenna 88-108 Mhz (FM)

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