Selex Communications S.p.a.

Other

Gaetano Marrocco

Manlio Proia

Giampiero Colasanti

Giovanni Falcione

Raffaele Perelli

Fernando Bardati

Piero Tognolatti

Lorenzo Mattioni

Cecilia Occhiuzzi

Francesco Spagnolo

Luciano Grapsa

The present invention relates to a self-locking security seal of the type mostly used within the scope of transporting goods, for the secure closure of containers or the like.

Self-locking security seal

A structural antenna system for operation in the HF frequency range, particularly for naval communications, is described, comprising at least one linear radiating arrangement () adapted to be operatively associated with a ground conductor (GND) and at least one electrical impedance device (Z-Z), in which the aforesaid linear radiating arrangement () is coupled to a pre-existing naval structure which has a predominantly vertical extension and is electrically conducting, such as a funnel (F). A structural antenna system with multiple feed comprises a plurality of linear radiating arrangements () positioned in meridian planes of the naval structure of the funnel type (F), spaced at equal angular intervals.

Wideband structural antenna operating in the HF range, particularly for naval installations

A linear antenna for operation in the HF frequency range, particularly for naval communications is disclosed, comprising a radiating arrangement (H, H, H, W, W), adapted to be operatively associated with a ground conductor () and at least one electrical impedance device (Z-Z), characterized in that it includes: a plurality of wire radiating elements with a predominantly vertical extension, forming a first and a second conducting branch (H, H) adapted to be operatively coupled to a feed circuit, and a return conducting branch (H) adapted to be operatively coupled to a ground conductor (); and a plurality of wire radiating elements with a predominantly transverse extension, forming connecting conducting branches (W, W) for connecting the conducting branches (H, H) adapted to be coupled to the feed circuit (), to the conducting branch (H) adapted to be coupled to the ground conductor (), the radiating elements being positioned in such a way as to form, in a plane in which the antenna lies, two nested closed paths (P, P) between the feed circuit () and the ground conductor (), having at least one radiating element in common, and&#x2014;a plurality of electrical impedance devices (Z-Z) interposed along the conducting branches (H, H, H, W, W) and adapted to impede the flow of current within corresponding predetermined frequency ranges in such a way as to establish selectively, according to the operating frequency, a plurality of different current paths along the conducting branches (H, H, H, W, W), corresponding to a plurality of different electrical and/or geometrical configurations of the antenna ().

Wideband multifunction antenna operating in the HF range, particularly for naval installations

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Montecompatri, Italy

Gaetano Marrocco