Help me to calculate exact lengths of dipoles and spacing between the elements ?

Dear friends

I am working on Phased array antenna(2 element)

can some one help me to calculate exact lengths of dipoles and spacing between the elements. Required length of transmission lines and coaxial cables.
Operating freq app 418 MHZ

I am new to RF world , so i v much hopeful for your co-op.

Best regards

hi,
If u design patch antenna with dimension 18x18 mm on RT/duriod with dielectric constant around 2 to 2.22 and thickness of around 3.175 mm then u can make it to oscilate at 4 GHz (app), so there is no need to go for array elements which is diffcult when compared with this patch design....
kishore

thx....

actually i have to implement phased array using dipoles as elements. i have no concern with patch antenna yet. i need to calculate spacings between two dipoles on an array,dipoles lengths and if any practical tutorial............


waiting for replies
best regards
ali

In a Phased Array the value of the phase shift is affected by nearby antennas and the distance from the ground-plane.
For 2 dipoles a 5/8 wavelength is the highest gain advantage over a single antenna, and with practical materials, gives you a little over 2.5 dB of gain.