Numerical analysis of a cellular automata irregular fractal wideband antenna

In this paper, the effect of an irregular-fractal slot added to the radiating patch of an UWB antenna is studied. The complex shaped-slot was generated randomly by applying the cellular automata technique. Analysis of simulated results dealing with the impedance matching, surface currents, gain and radiation patterns, shows three different behaviors: improvement of the impedance matching, rejection of one band, and rejection of two bands, depending on the shape and position of the slot. It is found that both the impedance matching and the gain of the UWB antenna can be enhanced for some particular shaped slots.