Design, Simulation and Fabrication of 2x2 Microstrip Patch Antenna Array Fed by Substrate Integrated Waveguide at x Band

This paper describes the design of a 2x2 micro¬strip patch antenna array in the frequency of 9.5GHz for radar applications, using substrate integrated waveguide, SIW, for feeding network. The micro¬strip patches are aperture-coupled with the feeding network of SIW. The feeding network consisting of a perpendicular coax-to-SIW transition and two Y-junction power dividers. The antenna is simulated in full wave software of CST and the prototype is fabricated. The measurement results good agreement with the simulation results. a fabricated prototype has a gain of 11.6dB and a side lobe level below -14.5dB in the E-plane and 18dB in the H-plane.