Matra

About: Matra is a based out in . It is known for research contribution in the topics: Signal & Detector. The organization has 1330 authors who have published 1216 publications receiving 17967 citations.

Digitally Controlled GaAs MMIC Attenuator for Active Phase Arrays

Abstract: Multi element arrays with active transmit-receive modules have resulted in the ability to reconfigure beam patterns and steer beams through the use of multibit phase shifters and amplitude control. The advantages of the GaAs MMIC in size, mass and reproducibility, together with negligible power consumption, are critical in the realisation of a versatile spacebourne synthetic aperture radar with the facility for reconfigurability by telecommand from groundstations. A six bit attenuator is presented, designed to cover the 4.9 to 5.7 GHz band but with excellent performance from D.C. to 6 GHz. The measured rms error for all states is 0.2dB.

Device for pointing a reflector antenna.

Abstract: of EP0455543The device, usable for pointing the reflector (10) of a satellite antenna, comprises an arm (13) fixed to the reflector and carried by a support, by way of a joint enabling it to rotate about two mutually orthogonal axes, passing through the focus of the reflector and perpendicular to one axis of the reflector. Means of driving the arm have a first rotary motor (22) with axis directed towards the focus, carried by the support (12) and driving a first lever (24) and a second rotary motor (26) with axis directed towards the focus, carried by the first lever and driving a second lever (28) connected to the arm by a connecting rod (20) rotating on the second lever (28) about an axis directed towards the focus.

Surface reflecting electromagnetic waves and process for producing it

Abstract: The present invention relates to a rigid surface reflecting electromagnetic waves, especially for antenna reflectors, electromagnetic shielding, and waveguides. According to the invention, this surface consists of an interlacement ( 7 ) of electrically conducting wires ( 2, 3 ) which consist, on the surface, of a stable metal diffusion alloy ensuring that said wires are fastened together and that said surface is rigidified.

Device for displacement of an element and application for the pointing of the reflector of an antenna

Abstract: This displacement device is applicable to the pointing of an on-satellite antenna reflector. It comprises two rigid transmission arms each having one end articulated on the member and another end articulated on a carriage (22). Each carriage (22) carries a drum (36) which can rotate about an axis perpendicular to the said direction and is provided with drive means on which is wound an inextensible and flexible band which is stretched between two anchoring points aligned along the said direction and which cannot slip on the drum.