900MHZ omni directional antenna design help

[7rots51]

I need pdf and articles on 900MHz omni directional (50 ohm) antenna design and formulas.

 

[guytoub]

hi!

do you mean that you want to design a planar monopole antenna?
if yes the formulae is very simple it's λ/2 and don't forget to use a ground plane

 

[7rots51]

I need the design of such antenna (same hape)

http://www.rflinx.com/products/antennas/omni-directional/#_900mhz_outdoor

Slim line omni