A vehicle
radar sensor unit (2) having an antenna arrangement (3), a
transceiver arrangement (4a, 4b, 4c, 4d) and a
processing unit (6). The antenna arrangement (3) includes at least one
transmitter array antenna (7) and at least two
receiver antennas (24, 25, 26; 27, 28, 29; 30, 31, 32; 33, 34, 35), where each
transmitter array antenna (7) have at least two sub-antennas (12, 13, 14, 15, 16, 17, 18, 19) that are vertically spaced from each other, where each sub-antenna (12, 13, 14, 15, 16, 17, 18, 19) have at least one
antenna element (20, 21), and where each
receiver antenna (24, 25, 26; 27, 28, 29; 30, 31, 32; 33, 34, 35) have a plurality of series fed antenna elements (22, 23) formed in a vertically extending column. Each sub-antenna (12, 13, 14, 15, 16, 17, 18, 19) is connected to the
transceiver arrangement (4a, 4b, 4c, 4d) that is adapted to feed the corresponding sub-antenna (12, 13, 14, 15, 16, 17, 18, 19) with a controllable phase, such that each
transmitter array antenna (7) is adapted to provide a
transmitter antenna beam (361, 362) that is controllable in an elevation direction (401, 402).