[求助]How  can I Draw and calculate the equivalent circuit of an antenna

hi d"5oD@JG:  
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. e'*`.^  
How should I calculate the lumped element of each segment of the radiator? +2K:qvzZ  
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? :Xn7Ha[f  
and more important form where we conclude that which length of the radiator works as a capacitance .. {/X4(;~0  
j4>a(  

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there is lumped network elememts bottom,in this you can set a capacitance or inductance!