50 ohm microstrip feed line for patch antenna array

Hi,

I am new to CST. I am working to design a patch antenna array. I want to design a 50 ohm microstrip feed for the patch. Can somebody guide me for that.

We need to know the design to tell you about the feed structure.

I am designing a 2.4 GHz circular patch antenna using CST. I used Balanis for calculations and came up with a radius of 17.336 mm of patch for FR4 substrate.
Epsilon= 4.7
Height of Substrate=1.6mm

The S11 parameter does not show a dip at 2.4 GHz. I guess I have a problem with the microstrip feed. I need help to design a microstrip feed for it with 50 ohm impedance