Importance

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Abstract

A linear antenna for operation in the HF frequency range, particularly for naval communications is disclosed, comprising a radiating arrangement (H1, H2, H3, W1, W2), adapted to be operatively associated with a ground conductor (20) and at least one electrical impedance device (Z1-Z4), characterized in that it includes: a plurality of wire radiating elements with a predominantly vertical extension, forming a first and a second conducting branch (H1, H2) adapted to be operatively coupled to a feed circuit, and a return conducting branch (H3) adapted to be operatively coupled to a ground conductor (20); and a plurality of wire radiating elements with a predominantly transverse extension, forming connecting conducting branches (W1, W2) for connecting the conducting branches (H1, H2) adapted to be coupled to the feed circuit (12), to the conducting branch (H3) adapted to be coupled to the ground conductor (20), the radiating elements being positioned in such a way as to form, in a plane in which the antenna lies, two nested closed paths (P1, P2) between the feed circuit (12) and the ground conductor (20), having at least one radiating element in common, and--a plurality of electrical impedance devices (Z1-Z4) interposed along the conducting branches (H1, H2, H3, W1, W2) 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 (H1, H2, H3, W1, W2), corresponding to a plurality of different electrical and/or geometrical configurations of the antenna (10).

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First Claim