Diehl Munitionssysteme Gmbh & Co. Kg

Robert Boschgmbh

Eberhard Gschwendtner

Volker Koch

Martin Hertel

Werner Wiesbeck

Thomas Wixforth

Jean Parlebas

A spiral antenna which can be supplied in different modes with different transmission characteristics is described. The spiral antenna includes four approximately parallel, electrically conducting spiral arms. The spiral arms are each connected to a coplanar conductor at their inner spiral arm ends for supplying and/or receiving signals.

Spiral antenna

A munition article is to be provided with an antenna which, by virtue of a characteristic which is uniform all around, permits interference-free reception of items of satellite navigation information, even if in the manner of an artillery projectile it is fired with spin along an elongate ballistic trajectory, so that a tail antenna with a spherical characteristic does not allow the expectation of good reception factors in relation to navigation satellites which are as high as possible above the horizon. Therefore the tip ( ) of the fuse tip ( ) of the projectile is equipped with a dipole satellite antenna which faces in the direction of flight. Connected to the dipole ( ) which is arranged concentrically with respect to the longitudinal axis ( ) of the projectile are symmetrically disposed conductor portions ( ) which rest with a close fit in recesses ( ) in the ballistic cap ( ).

Munition article with antenna for satellite navigation

A munition article ( ) is to be provided with an antenna ( ) which, by virtue of a characteristic which is uniform all around, permits interference-free reception of items of satellite navigation information, even if in the manner of an artillery projectile ( ) it is fired with spin along an elongate ballistic trajectory, so that a tail antenna with a spherical characteristic does not allow the expectation of good reception factors in relation to navigation satellites which are as high as possible above the horizon. Therefore the fuse tip ( ) of the projectile ( ) is equipped with a hollow-frustoconical portion of electrically conductive material such as light metal, which is designed in the form of a round-slot satellite antenna ( ) and in which a coaxial annular hollow space ( ) opens to the peripheral surface ( ) of the fuse through a slot ( ) which extends around the arrangement radially with respect to the longitudinal axis ( ) of the projectile and which is in the form of an annular disc configuration. As feed cables coaxial cables ( ), distributed uniformly around the periphery, can be connected with their inner and outer conductors ( ) at the inner mouth opening ( ) of the slot ( ) towards the hollow space ( ) to the slot walls ( ).

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Karlsruhe, Germany

Eberhard Gschwendtner