Radar system comprising two back-to-back positioned radar antenna modules, and a radar system holding an antenna module with cavity slotted-waveguide antenna arrays for radiating and receiving radar wave signals

A radar system comprising a first radar antenna module comprising:

• a first planar slotted waveguide antenna array configured for radiating electromagnetic waves, and
• a second planar slotted waveguide antenna array configured for receiving electromagnetic waves, wherein:
• each of the first planar slotted waveguide antenna array and the second planar slotted waveguide antenna array comprises several longitudinal extending waveguide columns disposed in a parallel and adjacent position with respect to one another, said longitudinal extending waveguide columns having a front side and a rear side with a plurality of cavity slots on the front side, and said longitudinal extending waveguide columns further having first column ends and second column ends;
• the longitudinal extending waveguide columns of the first planar slotted waveguide antenna array and the second planar slotted waveguide antenna array having an equal internal height and an equal internal width;
• the first planar slotted waveguide antenna array and the second planar slotted waveguide antenna array are arranged with the waveguide columns of the first planar slotted waveguide antenna array disposed in a parallel position to the waveguide columns of the second planar slotted waveguide antenna array;
• the front side of the columns holding the cavity slots of the first planar slotted waveguide antenna array are positioned in a first plane and the front side of the columns holding the cavity slots of the second planar slotted waveguide antenna array are positioned in a second plane parallel to said first plane;
• and
• the first and second parallel planes are offset with a minimum perpendicular array distance to each other in a direction perpendicular to said first and second parallel planes.