Abstract
In this paper, we present a new Ultra Wide Band (UWB) rectangular patch antenna conception method. Antenna impedance and pass band are studied depending on the dimensions of the notches introduction on developed patch and its presented ground. Obtained bandwidth is between 3.3GHz and 17.8GHz. The maximum gain is under 3.5 dBi and 8.7 dBi depending on operating frequency. The suggested UWB antenna is characterized by simplicity of design and power supply, a very low cost and a relatively stable radiation pattern over a very wide range. In addition, a network of two UWB-MIMO antennas with a DGS (Defected Ground Structure) decoupling structure, which consists in creating a slot in the ground plane of two antennas, is proposed. This isolation structure represents a notch filter to minimize the effect between adjacent antennas. Compared to the UWB-MIMO network without DGS, the proposed antenna array not only maintains the performance of each antenna, that reduces the coupling of 25 dB at 5.4GHz and 14 dB at 9.8 GHz and provides total isolation more than 15 dB in the bandwidth spectrum [3.3-17.8] GHz. Therefore, it is suitable for satellite communications in the C, X, and Ku bands.