The most used operating frequency 3.5 GHz is selected for the present WiMAX(patch array)antenna. Patch arrays with different configurations are designed and simulated by the Empire XCcel 3D simulator . Based on the simulation results their performances are evaluated. The 2 by 2 patch array with micro strip line and coaxial port provided the best results, was selected for the fabrication.The fabricated two patch array antennas were tested in normal room environment and their performance parameters are compared with simulation results. The results obtained showed good similarities with simulation results and can be considered satisfactory. A study was made at last to attach amorphous silicon solar cells on the upper surface of the patch array. Effort was also made on the placement of solar cells, without hampering the normal performance of patch array and solar cells. Different patch array configurations are considered not only to simulate but also to analyze and verify which configurations are suitable for easy integration with solar cells. Ths book is suitable for those who are interested to design and fabricate patch array.