Radar sensor and radar antenna for monitoring the environment of a motor vehicle

A radar antenna, comprising:

• a Rotman lens having a lenticular parallel-plate line, at least two supply leads, a plurality of coupling leads and delay lines;
• and
• a group antenna including a plurality of individual antennas each connected in series in at least two rows, each row connected to a delay line via an antenna terminal;
• wherein a delay line, configured to transmit a high-frequency signal supplied by the parallel plate line to a corresponding coupling lead to the row of individual antennas is provided for each row of individual antennas;
• wherein for a specified frequency of the high-frequency signal, a length of the delay lines is selected so that signals having a predetermined phase distribution are applied to antenna terminals in response to applying the high-frequency signal to each of the supply leads;
• and
• wherein a signal propagation delay occurring between the supply leads and the antenna terminals are changeable for different delay lines, for a predetermined frequency of the high-frequency signal, by substantially integral multiples of signal periods, to preselect an amplitude distribution of signals applied to the antenna terminals.

A radar antenna, comprising:

• a Rotman lens having a lenticular parallel-plate line, at least two supply leads, a plurality of coupling leads and delay lines;
• and
• a group antenna having a plurality of individual antennas, each connected in series in at least two rows;
• wherein the Rotman lens and the group antenna are spaced apart from each other and positioned substantially in parallel with each other.

A radar antenna comprising:

• a Rotman lens having a lenticular parallel-plate line, at least two supply leads, a plurality of coupling leads and delay lines;
• and
• a group antenna having a plurality of individual antennas, each connected in series in at least two rows;
• wherein the Rotman lens and the group antenna are spaced apart from each other and positioned substantially in parallel with each other;
• and
• wherein the Rotman lens is formed on a first substrate and the group antenna is formed on a second substrate, sides of the two substrates facing away from the Rotman lens and the group antenna interconnected, a common metallic coating arranged between the two substrates.

A radar antenna comprising:

• a Rotman lens having a lenticular parallel-plate line, at least two supply leads, a plurality of coupling leads and delay lines;
• and
• a group antenna having a plurality of individual antennas, each connected in series in at least two rows;
• wherein the Rotman lens and the group antenna are spaced apart from each other and positioned substantially in parallel with each other;
• and
• wherein the substrates are formed of a ceramic-filled composite of polytetrafluoroethylene.

A radar antenna comprising:

• a Rotman lens having a lenticular parallel-plate line, at least two supply leads, a plurality of coupling leads and delay lines;
• and
• a group antenna having a plurality of individual antennas, each connected in series in at least two rows;
• wherein the Rotman lens and the group antenna are spaced apart from each other and positioned substantially in parallel with each other;
• wherein a delay line, configured to transmit a high-frequency signal supplied by the parallel plate line to a corresponding coupling lead to the row of individual antennas is provided for each row of individual antennas;
• wherein for a specified frequency of the high-frequency signal, a length of the delay lines is selected so that signals having a predetermined phase distribution are applied to antenna terminals in response to applying the high-frequency signal to each of the supply leads;
• and
• wherein a signal propagation delay occurring between the supply leads and the antenna terminals are changeable for different delay lines, for a predetermined frequency of the high-frequency signal, by substantially integral multiples of signal periods, to preselect an amplitude distribution of signals applied to the antenna terminals.