Abstract: The invention relates to a protective circuit (10) for the input-side protection of an electronic device (30) operating in the maximum frequency range from high-power interfering impulses in the working frequency range of the device (30), said protective circuit (10) between an input (11) and an output (18) comprising a first limiting circuit (12) having at least one gas discharge tube (GDT1, GDT2) for limiting high interference powers and a second limiting circuit (14, 16) disposed behind the first limiting circuit (12), said second limiting circuit having semi-conductor components (D1, . . . , D4) for limiting smaller interference powers. Protection from particularly high interference powers is achieved in that the first limiting circuit (12) comprises two gas discharge tubes (GDT1, GDT2) connected in parallel and preferably identical.

Abstract: The invention relates to a protective circuit (10) for the input-side protection of an electronic device (30) operating in the maximum frequency range from high-power interfering impulses in the working frequency range of the device (30), said protective circuit (10) between an input (11) and an output (18) comprising a first limiting circuit (12) having at least one gas discharge tube (GDT1, GDT2) for limiting high interference powers and a second limiting circuit (14, 16) disposed behind the first limiting circuit (12), said second limiting circuit having semi-conductor components (D1, . . . , D4) for limiting smaller interference powers. Protection from particularly high interference powers is achieved in that the first limiting circuit (12) comprises two gas discharge tubes (GDT1, GDT2) connected in parallel and preferably identical.

Abstract: An antenna (10) having an emitter element which is positioned in front of a conductive reflector (13) and has a three-dimensional cast part. The cast part is implemented as conductive and has a closed peripheral structure (11) having alternating constrictions and bulges. The peripheral structure (11) spans an imaginary surface (14) which is intersected by at least two planes of symmetry (15.1, 15.3) of the cast part. At least two fastening elements (12.1, 12.2) are provided, which extend essentially perpendicular to the imaginary surface (14) and support the peripheral structure (11) at two points which lie on one of the planes of symmetry (15.1; 15.3). At the lower ends (16), the fastening elements (12.1, 12.2) are connected to the reflector (13), the fastening elements (12.1, 12.2) also being used for electrical excitation of the emitter element.

Abstract: An antenna (10) having an emitter element which is positioned in front of a conductive reflector (13) and has a three-dimensional cast part. The cast part is implemented as conductive and has a closed peripheral structure (11) having alternating constrictions and bulges. The peripheral structure (11) spans an imaginary surface (14) which is intersected by at least two planes of symmetry (15.1, 15.3) of the cast part. At least two fastening elements (12.1, 12.2) are provided, which extend essentially perpendicular to the imaginary surface (14) and support the peripheral structure (11) at two points which lie on one of the planes of symmetry (15.1; 15.3). At the lower ends (16), the fastening elements (12.1, 12.2) are connected to the reflector (13), the fastening elements (12.1, 12.2) also being used for electrical excitation of the emitter element.