Abstract: The invention relates to a directive broad band antenna element of V-shaped dipole type with bent wire- or strip-shaped dipole antenna (A). The dipole antenna is divided into two sections, a first section (S1) where the radiation is minimized (or prevented) by a small distance between the conductors and a reduced phase velocity, and a second section (S2), where the radiation is enhanced by increasing the phase velocity by means of introduced series capacitances (C1, C2, . . . Cn). The series capacitances have respective values which depend on the local angle between the dipole conductors and a radiation axis (x), and are chosen such that the phase velocity is increased to a value which effects radiation contributions from different parts of the conductors to cooperate in the desired radiation direction.

Abstract: A lens antenna of Luneberg type comprising a disc-shaped dielectric element having a radially varying diffraction index and bounded on both major sides by conductive metal plates. The antenna is preferably adapted for transmission of a wave which is polarized in an angle of 45.degree. relative to the plane of the lens element and is characterized in that the distance between the conductive plates and the lens element is filled with air or a dielectric having a corresponding dielectric constant.

Abstract: An antenna, preferably operating in the microwave range, comprising a Luneberg lens with a disc having a radially varying refraction index and provided with feeders distributed around the circumference. Each feeder has the shape of a thin wire the projection of which, as seen radially relative to the center of the round disc, forms a straight line inclined 45.degree. against the plane of the disc. All feeders are inclined in the same direction in their respective radial planes, whereby the feeders opposite a respective feeder will be oriented substantially perpendicular to the feeder permitting passage of radiation to and from the feeder. All of the feeders can be active simultaneously.

Abstract: An antenna, preferably operable in the microwave range, comprising a disc-shaped lens having a radially varying refraction index, and having feeders distributed around the circumference. Each feeder is in the shape of a thin wire having a projection which, as seen radially relative to the center of the disc, forms a straight line inclined 45.degree. relative to the plane sides of the disc. All feeders are inclined in the same direction relative to the center of the disc and thus all diametrically-opposed feeders are oriented substantially perpendicular to each other. Because of this orientation, radiation focussed by the lens passes to and from any active feeder without being substantially disturbed by other feeders, and a plurality of feeders can be active simultaneously.

Abstract: A lens antenna of Luneberg type comprising a disc shaped dielectric element having radially varying diffration index or dielectric constant and surrounded on both plane sides by conductive metal planes. The antenna is preferably adapted for transmission of a wave which is polarized in an angle of 45.degree. relative to the plane of the lens element and is characterized in that the distance between the conductive planes to an essential extent is formed by air or a dielectric having a corresponding dielectric constant.

Abstract: A dipole antenna consisting of a number of sub-elements, each sub-element comprising a plurality of thin electric conductors or strips of wires arranged on the surface of an insulating cylinder. The conductors in each sub-element have the same length and are distributed around the circumference of the cylinder, so that each such sub-element forms a so-called "thick" dipole element. The lengths of the conductors in different sub-elements are different, so that the sub-elements together will cover a broad frequency band. At least each conductor in the group having the longest conductors are provided with inductive reactances, to prevent excitation of said longer conductors in higher modes at resonance frequencies of the shorter conductors.