- #1
tackyattack
- 56
- 0
How do I make a Yagi-Uda antenna smaller?
I am trying to build a Yagi antenna for 900mhz and I am using this formula:
http://www.skyscan.ca/Antennas.htm
Length:
Reflector length = 0.495 x wavelength
Dipole radiator = 0.473 x wavelength
Director D1 = 0.440 x wavelength
Director D2 = 0.435 x wavelength
Director D3 = 0.430 x wavelength
----------------------------------------------
Spacing:
R-DR = 0.125 x wavelength
DR - D1 = 0.125 x wavelength
D1 - D2 = 0.250 x wavelength
D2 - D3 etc = 0.250 x wavelength
--------------------------------------------------------------------------------------------
But the problem is, when I use this formula with 900mhz the antenna ends up being huge. What I need to do is make it smaller. Would it work if I took all of the lengths and spacings then divide it by, say four?
I am trying to build a Yagi antenna for 900mhz and I am using this formula:
http://www.skyscan.ca/Antennas.htm
Length:
Reflector length = 0.495 x wavelength
Dipole radiator = 0.473 x wavelength
Director D1 = 0.440 x wavelength
Director D2 = 0.435 x wavelength
Director D3 = 0.430 x wavelength
----------------------------------------------
Spacing:
R-DR = 0.125 x wavelength
DR - D1 = 0.125 x wavelength
D1 - D2 = 0.250 x wavelength
D2 - D3 etc = 0.250 x wavelength
--------------------------------------------------------------------------------------------
But the problem is, when I use this formula with 900mhz the antenna ends up being huge. What I need to do is make it smaller. Would it work if I took all of the lengths and spacings then divide it by, say four?