AN ANTENNA FOR A RADAR APPARATUS

According to an example embodiment, an antenna assembly (110) for a radar apparatus (100) is provided, the antenna assembly comprising: a first feed antenna (111a) arranged to transmit outbound radio waves of a transmitter beam (113a) based on a transmitted RF signal supplied thereto and a second feed antenna (111b) arranged to capture a received RF signal based on inbound radio waves of a receiver beam (113b) received thereat; and a lens element (112) arranged to collimate the transmitter beam (113a) obtained via a back end of the lens element (112) for transmission from a front end of the lens element (112) to a monitoring direction and to focus the receiver beam (113b) received at the front end of the lens element (112) from the monitoring direction for reception via the back end of the lens element (112) at the second feed antenna (111b), wherein the first and second feed antennas (111a, 111b) are disposed on a conductive ground plane (115) that is offset from the back end of the lens element (112) by a predefined distance (k) in direction of a center axis (A) of the lens element (112), and wherein a volume between the back end of the lens element (112) and the ground plane (115) comprises material that has a refractive index that is smaller than that of the lens element (112) for converging the outbound and inbound RF beams between the back end of the lens element (112) and the first and second feed antennas (111a, 111b).