Abstract: A light emitting device comprises a flip-chip light emitting diode (LED) die mounted on a submount. The top surface of the submount has a reflective layer. Over the LED die is molded a hemispherical first transparent layer. A low index of refraction layer is then provided over the first transparent layer to provide TIR of phosphor light. A hemispherical phosphor layer is then provided over the low index layer. A lens is then molded over the phosphor layer. The reflection achieved by the reflective submount layer, combined with the TIR at the interface of the high index phosphor layer and the underlying low index layer, greatly improves the efficiency of the lamp. Other material may be used. The low index layer may be an air gap or a molded layer. Instead of a low index layer, a distributed Bragg reflector may be sputtered over the first transparent layer.

Abstract: Multifrequency reflecting antenna (AR), for example for a telecommunication satellite that comprises a reflector (R) with a front face (FA) for reflecting beams of electromagnetic waves belonging to at least two different frequency bands. The front face (FA) of the reflector (R) comprises a structure (ST) defining a three-dimensional pattern with symmetry of revolution, chosen so as to shape the beams such that they have approximately identical radiofrequency characteristics.

Abstract: Multifrequency reflecting antenna (AR), for example for a telecommunication satellite that comprises a reflector (R) with a front face (FA) for reflecting beams of electromagnetic waves belonging to at least two different frequency bands. The front face (FA) of the reflector (R) comprises a structure (ST) defining a three-dimensional pattern with symmetry of revolution, chosen so as to shape the beams such that they have approximately identical radiofrequency characteristics.

Abstract: Dual polarisation antenna having low side lobes, useful in a satellite radio communication system. The antenna includes a reflector assembly (12) illuminated by a feed source (11). The reflector assembly (12) includes a front reflector (15) that reflects two electromagnetic waves orthogonally polarized and each at a different frequency, an auxiliary reflector (16) that reflects one of the orthogonally polarized electromagnetic waves, and a deflecting surface (13) that totally diffracts the orthogonally polarized electromagnetic wave that passes through the auxiliary reflector (16).

Abstract: Dual polarisation antenna having low side lobes, useful in a satellite radiocommunication system.

Abstract: The present invention concern a method using powder metallurgy for producing molded parts intended to be assembled by self-brazing to metal parts capable of receiving them and said receiving parts. The method comprises forming a homogenous mixture of a basic metal powder, brazing powder and a liquid binding agent which is injection molded to form a self-brazing part.

Abstract: The process relates to the production of a green from slurry by solidification after injection into a mold having a temperature of less than 0.degree. C. The mold and moveable parts of a jack ensure closure thereof and are housed within a gas-tight vessel. A distributor for dry gas with a dew point lower than the temperature of the mold emits a gas current through apertures. The green is conducted outside the vessel through an aperture which is opened in a continuous or discontinuous manner. The process is applicable to the production of sintered metallic or ceramic parts with high density and high performance mechanical characteristics.

Abstract: A device for the production of a green from slurry by solidification after injection into a mold having a temperature of less than 0.degree. C. The device includes a mold having a jack wherein moveable parts of the jack ensure closure thereof and which are housed within a gas-tight vessel. A distributor for dry gas with a dew point lower then the temperature of the mold emits a gas current into the vessel through apertures. A chute conducts the green towards an exit aperture and to a receiving member outside the vessel.

Abstract: A radiating device for a planar antenna, said device including a first ground plane and a second ground plane, a slot (25) provided in the first ground plane and being fed by electromagnetic coupling from a feed line (17), and an assembly of a plurality of thin conductive parts; the central portion of the radiating slot (25) being a conductive part (15) supported at its center by a supporting column (18). Application in particular to the space field.

Abstract: The anti-seizing coating according to the invention relates to the protection of the surfaces of male (7) or female (2) components of an assembly means (1) for metal tubes by threadings coming into contact with one another at the time of screwing.This coating is constituted by a thin lead oxide layer (14) produced by the oxidation of a lead layer, which is itself formed on an underlying layer (13) of a metal such as copper and which has been directly or indirectly deposited beforehand on the surface (4, 5, 9, 10, 11, 6) to be protected against seizing. The invention also relates to the process for producing this coating and the coated assembly means obtained.