Optimization of the input impedance of Koch Pre-Fractals antennas with genetic algorithms

This work presents an optimization on the input impedance of Koch Pre-fractals patches antennas using an efficient genetic algorithm (GA). The impedance matching is done by recesses (inset-fed), which is optimized to minimize the return loss (RL). The excitation of this structure is done using a microstrip line (L0). The antennas are designed using the package Ansoft Design™ software and the new structures optimized with GA are simulated, measured and compared with the same patch antenna but with the lengths of the inset-fed (y0) calculated by well known models available in the literature. The return loss value of the GA optimized antenna is presented below -40 dB at the resonant frequency.