In this study, rectangular 1x4 microstrip array antennas operating at 2500 MHz frequency for wireless high speed internet access WiMax were designed, simulated and fabricated. Artificial neural networks (ANN) were used to improve the physical and electrical performances of the simulated and fabricated microstrip structures and the results were evaluated. HFSS (High Frequency Structural Simulator) software simulation program, which solves electromagnetic structures with finite element method, was used in the studies. The measurements were carried out using a Network Analyzer in a laboratory environment where experimental setups were prepared. In terms of electrical results and physical dimensions, a successful product that can be used in the industrial field has been created.