antenna-theory.com

[Rfdesign]

hi
I want to draw the equivalent circuit of an antennas but i don't know how should I draw it?I simulated my design in CST.
How should I calculate the lumped element of each segment of the radiator?
In the antenna designing we only have a conductor patch to radiate , feeding pin, short pin, substrate and the ground plane, so how can we create capacitance or inductance effect in that structure?
and more important form where we conclude that which length of the radiator works as a capacitance or inductance ?
would you help me please?

[Schubert]

The feeding pin is your inductance. The open end of the patch antenna is capacitive. The radiation itself can be viewed as a radiation resistance. You should read this page and understand it to give you an idea for slot or if a antennas:

http://www.antenna-theory.com/antennas/aperture/ifa.php

[Rfdesign]

thanks for your reply.
I'll read and ask if it exists yet.