Abstract
This paper presents design of fractal regular slots patch antennas for Ultra-wideband (UWB) systems. The reference antenna is an UWB monopole rectangular patch antenna. Twenty proposed different fractal slots with regular configurations have been inserted randomly to the patch of the reference antenna to modify its characteristics and decrease the patch area. Four antennas cases out of these twenty proposed configurations are investigated in terms of the antennas different parameters including impedance bandwidth characteristics, radiation patterns, surface current distribution, gain, and group delay evaluation. The simulation and measurement results prove that the fractal slot configurations and positions create a filtering behavior in the form of mismatch band and band reject characteristics.