Abstract: Apparatus for dual-band antenna and communications tower comprising such apparatus are provided. The apparatus comprises a first part (202) comprising first and second propagation paths configured to selectively propagate signals of a first frequency with either a first polarization state or a second polarization state, a transition part (204) rotatable between first and second transition positions to selectively propagate signals of a second frequency along the second signal path with the first polarisation state when in the first transition position and with the second polarisation state when in the second transition position and a rotator part rotatable between first and second rotator positions. Wherein, the rotator part is configured to orientate the polarisation of signals in the second signal path in order to couple the second signal path to an interface, and allow propagation of signals in the first signal path in either the first or second rotator positions.

Abstract: An apparatus, for example a multi-band radio frequency antenna system, comprising: a primary reflector, for example a parabolic reflector; and a near-field feed arrangement comprising: a multi-band waveguide feed comprising a first waveguide feed for a first frequency band and a second waveguide feed for a second frequency band separate to the first frequency band, wherein the first waveguide feed and the second waveguide feed are co-axial and have, respectively, a first aperture and a second aperture; and a splashplate located within the near-field of the first waveguide feed, located within the near field of the second waveguide feed and configured as a feed for the primary reflector.

Abstract: A multiband antenna feed, an antenna incorporating the multiband antenna feed and a method are disclosed. An apparatus, comprises: a first port which may be configured to convey a first signal at a first frequency. A second port may configured to convey a second signal at a second frequency. The second frequency may be higher than the first frequency. A third port may be configured to convey the first signal and the second signal with a feed for a multiband antenna. The third port may have an inner waveguide and a coaxial waveguide. A first network may couple the first port with the coaxial waveguide and may be configured to propagate the first signal between the first port and the coaxial waveguide. A second network may couple the second port with the inner waveguide and may be configured to propagate the second signal between the second port and the inner waveguide.

Abstract: Apparatus for dual-band antenna and communications tower comprising such apparatus are provided. The apparatus comprises a first part (202) comprising first and second propagation paths configured to selectively propagate signals of a first frequency with either a first polarization state or a second polarization state, a transition part (204) rotatable between first and second transition positions to selectively propagate signals of a second frequency along the second signal path with the first polarisation state when in the first transition position and with the second polarisation state when in the second transition position and a rotator part rotatable between first and second rotator positions. Wherein, the rotator part is configured to orientate the polarisation of signals in the second signal path in order to couple the second signal path to an interface, and allow propagation of signals in the first signal path in either the first or second rotator positions.

Abstract: An apparatus, for example a multi-band radio frequency antenna system, comprising: a primary reflector, for example a parabolic reflector; and a near-field feed arrangement comprising: a multi-band waveguide feed comprising a first waveguide feed for a first frequency band and a second waveguide feed for a second frequency band separate to the first frequency band, wherein the first waveguide feed and the second waveguide feed are co-axial and have, respectively, a first aperture and a second aperture; and a splashplate located within the near-field of the first waveguide feed, located within the near field of the second waveguide feed and configured as a feed for the primary reflector.

Abstract: The invention relates to a method comprising: ° milling of a first waveguide substrate element (1a) to provide two waveguide cavities (3, 5a) with respectively a first and a second port (3re, 5re) on a common side of the first substrate element (1a), ° milling of a recess (5b) on a side of a second waveguide substrate element (1b), ° assembling the first and second substrate elements (1a, 1b) so that the waveguide cavities (3, 5a) and the recess (5b) form a continuous waveguide.

Abstract: A dual-reflector antenna comprises a main reflector traversed by a feed source and a sub-reflector. The sub-reflector comprises a dielectric body extending between a first end that is small in diameter and a second end that is greater in diameter, the small-diameter end being connected to the end of the feed source constituted by a metal tube filled with a dielectric material. The end of the feed source connected to the sub-reflector comprises a housing, having an inner depth and inner diameter, built into the dielectric material. The small-diameter end of the sub-reflector comprises an inner portion having a substantially cylindrical shape, able to fit into the housing, having an outer length and outer diameter. The outer length and outer diameter of the small-diameter end of the sub-reflector are respectively less than the inner depth and inner diameter of the feed source, so as to form a space between the inner portion of the sub-reflector and the dielectric wall of the housing.

Abstract: A subreflector of a dual-reflector antenna comprises a first extremity comprising a convex inner surface, a second extremity adapted for coupling to the extremity of a waveguide, and a body extending between the first extremity and the second extremity. The body comprises a first dielectric part having a portion penetrating into the waveguide and a portion outside the waveguide, and a second metallic part comprising a first cylindrical portion, contiguous with the first extremity of the subreflector, whose diameter is greater than the portion outside the waveguide of the first dielectric part, and a second cylindrical portion, adjacent to the first cylindrical portion, extended by a conical portion that penetrates into the first dielectric part. The first cylindrical portion features a flat ring-shaped surface that forms an angle less than 90° with the axis of the subreflector so as to face the primary reflector.

Abstract: A radome for a concave-reflector antenna is fastened directly onto the reflector's edge. The inner surface of the radome comprises at least one absorbent part partially covering its surface area and disposed along its peripheral edge. The surface area of the radome covered by the absorbent part(s) is less than 15% of the total surface area. The radome may comprise two absorbent parts in diametrically opposite positions. Each absorbent part may have a substantially triangular shape, the base of the absorbent part being rounded along the radome's edge, and a portion of its surface area having been removed laterally from each side of the triangle in a circular arc cut-out.

Abstract: A dual-reflector antenna comprises a main reflector traversed by a feed source and a sub-reflector. The sub-reflector comprises a dielectric body extending between a first end that is small in diameter and a second end that is greater in diameter, the small-diameter end being connected to the end of the feed source constituted by a metal tube filled with a dielectric material. The end of the feed source connected to the sub-reflector comprises a housing, having an inner depth and inner diameter, built into the dielectric material. The small-diameter end of the sub-reflector comprises an inner portion having a substantially cylindrical shape, able to fit into the housing, having an outer length and outer diameter. The outer length and outer diameter of the small-diameter end of the sub-reflector are respectively less than the inner depth and inner diameter of the feed source, so as to form a space between the inner portion of the sub-reflector and the dielectric wall of the housing.

Abstract: The antenna system comprises a first module ensuring the radiofrequency function and containing at least one antenna and at least one radio connection box, a second assembly module ensuring the fastening and positioning of the antenna system onto a mount, and an interface part ensuring the connection between the first module and the second module and enabling a rotating junction between the first module and the second module. Preferably, the antenna system has a generally smooth round shape.

Abstract: Antenna (1) presenting a concave reflector (10) defining a central axis of reflection z-z, comprising: a radome (20) adapted for mounting on said concave reflector (10), an absorbent device (50) adapted for absorbing electromagnetic waves, wherein a central axis y-y of the absorbent device (50), as being the axis perpendicular to the largest flat surface of the absorbent device (50), is substantially aligned along said central axis of reflection z-z.

Abstract: The antenna system comprises a first module ensuring the radiofrequency function and containing at least one antenna and at least one radio connection box, a second assembly module ensuring the fastening and positioning of the antenna system onto a mount, and an interface part ensuring the connection between the first module and the second module and enabling a rotating junction between the first module and the second module. Preferably, the antenna system has a generally smooth round shape.

Abstract: A radome for a concave-reflector antenna is fastened directly onto the reflector's edge. The inner surface of the radome comprises at least one absorbent part partially covering its surface area and disposed along its peripheral edge. The surface area of the radome covered by the absorbent part(s) is less than 15% of the total surface area. The radome may comprise two absorbent parts in diametrically opposite positions. Each absorbent part may have a substantially triangular shape, the base of the absorbent part being rounded along the radome's edge, and a portion of its surface area having been removed laterally from each side of the triangle in a circular arc cut-out.

Abstract: A subreflector of a dual-reflector antenna comprises a first extremity comprising a convex inner surface, a second extremity adapted for coupling to the extremity of a waveguide, and a body extending between the first extremity and the second extremity. The body comprises a first dielectric part having a portion penetrating into the waveguide and a portion outside the waveguide, and a second metallic part comprising a first cylindrical portion, contiguous with the first extremity of the subreflector, whose diameter is greater than the portion outside the waveguide of the first dielectric part, and a second cylindrical portion, adjacent to the first cylindrical portion, extended by a conical portion that penetrates into the first dielectric part. The first cylindrical portion features a flat ring-shaped surface that forms an angle less than 90° with the axis of the subreflector so as to face the primary reflector.

Abstract: The aim of the present invention is a sub-reflector of a dual-reflector antenna comprising: a first end having a junction of a first diameter, adapted for coupling to the end of a waveguide, a second end, having a second diameter greater than the first diameter, a convex reflective internal surface placed at the second end having an axis of revolution, an external surface of the same axis, joining the two ends, a dielectric material extending between the first and the second ends and limited by the internal surface and the external surface, In accordance with the invention, the external surface has a convex profile described by a polynomial equation of the sixth degree of the formula: y=ax6+bx5+cx4+dx3+ex2+fx+g where a is not zero.

Abstract: The object of the present invention is a rigid radome for a broadband parabolic antenna. The radome has a roughly circular shape, and is bent along a diameter towards the interior of the antenna, thereby forming two half-disks. The two half-disks form an angle less than or equal to 12° with the plane perpendicular to the antenna's axis. The radome is made up of a sandwich-style multilayer material, comprising two outer layers surrounding at least one central pitted layer, whose pits have a roughly conical shape.

Abstract: The present invention provides an antenna comprising at least two arrays comprising respective pluralities of radiating elements in alignment, disposed in parallel planes, and metal screens interposed between the arrays, the antenna being characterized in that each metal screen comprises a bottom portion facing non-radiating portions of the radiating elements and comprising respective plane sheets disposed in planes parallel to the planes of the arrays, and top portions facing the radiating portions of the radiating elements and comprising panels, each forming an angle with the planes of the bottom portions. Preferably, each panel is oriented in alternation in one direction and in another direction on either side of the plane of the bottom portion. Advantageously, each panel comprises two wings connected to a central zone attached to the bottom portion of the screen.

Abstract: The present invention relates to a method of assembling a radiocommunication antenna comprising a reflector connected to a subreflector via a circular section waveguide extending along a longitudinal axis. According to the invention, such a method comprises the following steps: the step of pivoting the waveguide about its longitudinal axis to determine a position such that an offset of the plane of propagation of a polarized electromagnetic field transmitted by this guide is limited, the step of marking this position on the waveguide, and the step of fitting the waveguide to the reflector as a function of this mark.

Abstract: The present invention consists in an antenna including at least two arrays of radiating elements disposed linearly and parallel, plane metal screens being interleaved between the arrays. According to the invention screening means, added above the radiating elements, comprise criss-cross metal filaments forming a grid and adapted always to be placed between two radiating elements.