How to create coax feed of a dual band GPS microstrip antenna?

Hi. I need help about creating probe and coax of dual layer gps microstrip antenna.I substracted a cylinder from bottom sub and top sub and filled them with pec(material of coax) with raduis 0.65mm. But it does not seem to work.What should the dimensions of air box be? Should i use waveport or lumped port Any help is appreciated.

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Here are the pictures of the antenna without coax feed but i substracted cylinders from bottom sub and top sub for them. Should i substract a circle from bottom patch?

have u get ur ans?

take cut 4m its bottom and if u are using 2 substrae then take separate probe for each substrate.