Disclosed is an ultra-wide band (UWB) antenna for satellite television, mainly in the x-band range, said antenna being supplied with power through a slot in the ground plane. The invention relates to a new rectangular antenna composed of rectangular substrates and two rectangular patches. Said antenna is an electromagnetic transceiver device that makes it possible to emit in the UWB range using an SMA connector, thus resulting in greater gain, a large bandwidth, a reduced size of 21.25mm x 22.25mm, good suitability for the x-band frequency range, and low production costs. The antenna consists of a single rectangular patch connected to the output by means of an SMA connector. The antenna is powered using electromagnetic coupling. The power supply point is connected to an SMA connector (figure 7) which is inserted into the microstrip line, thus making it possible to increase gain, directivity and the bandwidth. The device of the invention is particularly suitable for satellite television applications in the x-band range.