Radiofrequency exciter of a receiving and transmitting antenna

A compact radiofrequency driver comprising at least one axial port (AA) intended to be connected to a radiating antenna, at least one output (DRx, GRx) intended to collect signals received by said antenna and at least one input (DTx, GTx) intended to transmit signals via said antenna, further comprising:

• a first septum polarizer (PS1);
• a second septum polarizer (PS2);
• and
• a first frequency filter (F1),
• the two septum polarizers each comprising three ports, one of the ports being a common port (AC1, AC2) and the other two ports, being a right port (AD1, AD2) and a left port (AG1, AG2), each of the common port, left port, and right port being rectangular ports (AD1, AD2, AG1, AG2), the second septum polarizer being connected via its common port to a first rectangular port of the first polarizer and the frequency filter being connected to the second rectangular port of the first polarizer and being configured to filter a reception frequency band or a transmission frequency band, the axial port being connected to the common port of the first polarizer, the input and the output being connected to the filter or to a rectangular port of the second polarizer,
• and wherein the septum of the first polarizer (PS1) is configured to convert, in a transmission frequency band, a linearly polarized signal received on one of its rectangular ports (AD1, AG1) into an elliptically polarized signal received on its common port (AC1), and to preserve, in a reception frequency band different from said transmission frequency band, an elliptical polarization between the elliptically polarized signal received on its common port (AC1) and the signal output from its rectangular ports (AD1, AG1).