An antenna device comprises a first chain of at least two antenna components, wherein each of the antenna components comprises a transmit antenna having a line of antenna patches for emitting radar waves; and a receive antenna having a line of antenna patches for receiving radar response waves; wherein the line of antenna patches of the receive antenna is aligned with the line of antenna patches of the transmit antenna. An amplifier and receiver circuit for amplifying radar signals and for receiving radar re-sponse signals, the amplifier and receiver circuit comprises a phase shifter for shifting a phase of the radar signals to be amplified and for synchronously shifting the received radar response signals. A radar circuit comprises a first chain of at least two radar components, wherein each of the radar components comprises: an amplifier and receiver circuit as described above; and a transmit antenna for emitting radar waves; and a receive antenna for re-ceiving radar response waves.
