Thomson-csf Radant

Gerard Collignon

Claude Chekroun

Disclosed is a source of microwave radiation, namely a source enabling the absorption of multiple reflections for the illuminating of a lens in order to form an electronic sweeping antenna. The source includes a layered arrangement of elementary illuminators in a direction substantially parallel to the electrical field of the microwave energy transmitted. In one embodiment, each elementary illuminator has the following successively, in the direction of propagation of the energy: a plane forming a short circuit; a plane forming an incidence filter, parallel to the above plane, located at a distance from the above plane of the order of half of a wavelength, including two tracks parallel to each other and perpendicular to the electrical field between which resistive elements are connected; and, a plane bearing a rdiating element of the snake line type, extending in a direction substantially normal to the electrical field. The illuminator and the filter are such that the filter at least partially absorbs the microwave energy received with a non-zero angle of incidence.

Source of microwave radiation for an electronic sweeping antenna which

Disclosed is a device designed to selectively absorb the electromagnetic waves coming from multiple reflections in a microwave lens. In an antenna of the type including an energy source and a lens, where the lens is formed by a plurality of parallel channels separated by conductive planes, the device has a slot made in each of the conductive planes, arranged on the input face side of the lens, and also has localized or distributed resistors connecting the two edges of the slot. The geometry of the entire unit, and the values of the resistors are such that the waves coming from multiple reflections are absorbed by the resistors.

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Limours, France

Gerard Collignon