Design a 900 Hybrid Feed Square Patch Stacked Antenna at 3GHz

Microstrip antennas find wide applications in high-speed vehicles, and missiles, tanks, satellite communications etc. The main advantage of these antennas over conventional microwave antenna are lightweight, low volume, low cost, planar structure and compatibility with integrated circuits. The present paper deals with the design and development of 90o hybrid feed square patch stacked antenna. The design of square patch and 900 hybrid feed has been carried out at frequency of 3 GHz on epoxy glass substrate, the radiation pattern of the square patch has been experimentally studied. The effect of stacked patches placed above the square patch has been studied experimentally for different cases like 1,2,3 and 4 stacked patches placed one above other above the driven square patch. From the experimental result it has been found that performance of the case of 1 + 2 (one driven element and two parasitic element) is optimum with bandwidth of 16 % and VSWR 1.42 the performance degrades the no of practical elements is increased that is for case 1 + 3 and 1 + 4 etc., The performance of 1 + 2 case of also found to be superior to the performance 1+ 0 and 1+1 cases experimentally studied, also been carried out for cross Polarization and co – polarization.