Patent ID: 8890759
Filing Date: 2014-11-18
Classification: G01F,H01Q

Abstract:
1. A horn antenna for a radar device comprising: a metal body having a hollow horn section which expands to an open end in the metal body; a dielectric filling body arranged in the hollow horn section and having a first conical portion situated towards the open end of the metal body and fittingly received in the hollow horn section, a second conical portion situated away from the open end and dimensioned to leave a gap between itself and a wall of the hollow horn section, and a third portion between said first and second portions; a dielectric cover attached to the dielectric filling body and sealingly closing the open end of the metal body; and circumferential grooves arranged in pairs opposite each other provided in the third portion and in an opposite portion of the wall of the hollow horn section, the circumferential grooves being filled with a cured encapsulation material which is one of dielectric and conductive; wherein a depth of the circumferential grooves in the metal body is one of constant and increases with increasing distance from the open end of the metal body if the encapsulation material is dielectric; and wherein a depth of the circumferential grooves in the dielectric filling body is one of constant and increases with increasing distance from the open end of the metal body if the encapsulation material is conductive.