Design of a microstrip square-ring slot antenna filled by an H-shape slot for UWB applications

A novel microstrip slot antenna for UWB (ultra wideband) antenna applications is proposed. A square ring slot antenna is filled by an H shape slot as a parasitic element. This structure is fed by a single microstrip line with a fork like-tuning stub. Experiments are carried out to investigate its return loss, its radiation behavior, which exhibit good radiation pattern and impedance bandwidth over the entire band of frequency.