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This paper describes the concept of air gap structure to enhance the antenna’s gain. The structure of the planar antenna array consisting rectangular16 elements is comprised based on corporate feed network. The advanced of this antenna design is the antenna’s feeding network is etched on a different layer from the elements by certain of air gap distances. The air gap antenna was separated and measured from 0mm to 20mm, in 0.5 mm increments respectively. Quadratic slots enabled most of the induced current and power from source to the radiating patches. The magnetic characteristics of quadratic allowed absorbing the reflected electrical fields around the slots. The configuration of air gap is competent influencing a stronger fringing field at the edge of the patches. The fringing fields become stronger as the distance is getting increased. A strong fringing fields leads for the patches to radiate even further. The …