Koch fractal antenna application in monopulse antenna array

This paper addresses the design and evaluation of monopulse antenna array used in UAV on-board collision avoidance radar. The antenna array use the advantages of the fractal geometry. The inverted Koch square patch fractal antenna has been modified in order to gain more control over the efficiency degradation originating from production difficulties and to meet the requirements of a monopulse collision avoidance radar. Simulation and measurement results show the applicability of fractal geometry in antenna arrays.