The antenna system for establishing two-way radio communication between an unmanned aerial vehicle (UAV) and a ground station is applicable for controlling and receiving information from an unmanned aerial vehicle (lighter or heavier than air), wherein circular polarization of its antenna's electromagnetic field is used, and the radiation pattern of the antenna is dynamically controlled depending on the momentary orientation of the UAV. The antenna system on board the UAV consists of three constituent elements (1x, 1y, and 1z) of the flight antenna, respectively connected to the three inputs of a switching unit (2), the three outputs of which are respectively connected to the three inputs of a preamplifier (3). The outputs of the preamplifier are connected to the respective three inputs of a unit for dephasing and matching the receiving tract (4'), the output of which is connected to the input of a receiver (5), while the output of an autopilot (7) is connected to the fourth input of the unit (4'). The three outputs of a unit for dephasing and matching the transmitting tract (4") are respectively connected to the second set of three inputs of the switching unit (2), with the output of a transmitter (6) connected to its input, while the second output of the autopilot (7) is connected to the second input of the unit (4"). The output of a command unit (8), which is in two-way communication with the receiver (5) and the transmitter (6), is connected to the seventh input of the switching unit (2). 2 claims, 2 figures.
