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cpw equivalent circuite

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cpw equivalent circuit

Hi tehre.
please help me:
I designed an antenna with cpw on back of substrate and a patch on substrate.
I want to find its equivalent circuit.
I used the book "Coplanar Waveguide Circuits,Components,and Systems" to find formulas but I couldnt deceide which one to use?!!!
ground backed cpw formulas or simple cpw formulas?!!!
 

can you give a schrma or pic of ur design
 
Untitled.png

the substrate has h=1 and the material is FR4.

- - - Updated - - -

just keep the square patch on substrate on transfer the cpw feed (strip and two grounds) to the back of substrate
 

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