Abstract: The invention relates to walls that are used for constructing radomes, in particular radomes for aircraft radars, as well as radomes using such walls.According to the invention, the inner and outer layers of said wall are separated by a central core including a central portion made of dielectric material flanked by two lateral portions made of the same dielectric material but with a recess, the aggregate of said portions being obtained by juxtaposition of elemental dominoes.

Abstract: Disclosed is a structure at least partially comprising a composite material, the material being made by means of sheets of fibers embedded in a matrix, the different sheets forming plies of the material, the material comprising intrinsic means for the detection and localization of a mechanical irregularity, these means comprising at least one polarization-maintaining birefrigent optical fiber having a so-called slow axis and a so-called fast axis, embedded in the matrix and describing a known path inside the material, wherein the optical fiber is included inside a casing with an internal diameter that is greater than the external diameter of the fiber.

Abstract: A structure which includes a composite material formed of a plurality sheets forming plies. A casing is formed between two of the plurality of sheets forming the composite material, the casing having an internal diameter. Further, an optical fiber is located within the casing and has an external diameter which is less than the internal diameter of the casing, the optical fiber also having a slow axis and a fast axis of propagation.

Abstract: A radar antenna of small overall dimensions is provided, placed in a belly radome, including a reflector of paraboloid shape of revolution about the longitudinal axis and integral with a case. This assembly is mounted for pivoting about the transverse axis and about the vertical axis inside the radome.Rotation about the longitudinal axis called roll axis is provided by rotating the transmission source by rotation means placed inside the case and the duct. With the reflector fixed in the roll direction, the area thereof may extend over the whole of the inner section of the radome, rotation of the radar beam along the roll axis being obtained through rotation of the source with respect to the reflector.

Abstract: An inverted Cassegrain antenna utilizing polarization rotation. The polarizer-reflector or mirror utilized comprises two or more polarizer-reflector elements joined together around hinges perpendicular to the widening direction required. A sheet comprising parallel metal wires covers the whole of the elements. For each element, a metal film is separated from the sheet by a first dielectric layer. Each hinge is formed, on one side, by the flexible sheet of metal wires which straddles the gap between elements. The other side of the hinge includes a second dielectric layer backed by a rigid metal strip, also straddling the gap. One end of the metal strip is fixed to the metal film of one adjacent element while the other end of the metal strip is in moveable electrical contact with the metal strip of the other adjacent element. The antenna is particularly applicable to multiple function radars.

Abstract: An imbalance equilibrating system for an airborne radar system in which the rotation about its axis, in a clockwise or counterclockwise direction, of a pivoting element placed in cantilever relationship with respect to its axis of rotation, causes cables to wind about a pulley which is integral with and has the same axis of rotation as the pivoting element, whereby the cables transfer the rotational movement of the pivoting element to an antagonistic movement of a remotely located equilibrating mass.

Abstract: The central part of the nut of a gimbal mounting system for rotating a microwave antenna and the like is given a movement of elevation about the second axis (5) when the corresponding motor (II) is started-up and a circular movement about the first axis (3) orthogonal with the second axis when the corresponding motor (I) alone is started up, said circular movement automatically producing a movement of elevation about the second axis.