Horn antenna for a radar device

摘要

A horn antenna for a radar device comprises a dielectric filling body (7) arranged in a hollow horn section (3) of a metal body (1) and a dielectric cover (8) attached to the filling body (7) and sealingly closing the open end (4) of the metal body (1). The filling body (7) has a first conical portion (13) which is fittingly received in the hollow horn section (3), and a second conical portion (14) which is situated away from the open end (4) and is dimensioned to leave a gap (15) between itself and the wall of the hollow horn section (3). To provide a wear and maintenance-free attachment of the dielectric filling body (7) in the horn antenna, the dielectric filling body (7) has a third portion (18) between said first and second portions (13, 14) which third portion (18) and the opposite portion of the wall of the hollow horn section (3) are provided with circumferential grooves (19, 20) arranged in pairs opposite each other. The grooves (19, 20) are filled with a cured encapsulation material (21) which is preferably dielectric. The depth of the grooves (20) in the metal body (1) is constant or increases with increasing distance from the open end (4) of the metal body (1).