Abstract: The present invention relates to an antenna which is electronically reconfigurable in transmission. The antenna comprises an array (11) of elementary sources, an energy-focusing reflector (10), with the array (11) being situated in the focal zone of the reflector, and control and feed electronics, the electronics comprising an amplifier stage (22) constituted by amplifiers (24) and including at least one generalized coupler disposed at the outputs of the amplifiers (24), and beam-forming circuits (20, 21) each corresponding to a transmitted beam, with the amplitude and relative phase of the signals leaving said circuits being controlled by respective adjustable phase shifters and adjustable attenuators. The invention is particularly applicable to space telecommunications.

Abstract: The mixer comprises a microelectronic circuit composed of one or a number of active electronic elements having a nonlinear characteristic and carried on a substrate, the elements being supplied by waveguide lines placed on the substrate. The microelectronic circuit is fixed within a closed casing and connected to terminals placed on the casing in order to mix an incident wave S having a frequency F.sub.S applied to a first terminal of the casing with a mixing wave OL having a frequency F.sub.L applied to a second terminal of the casing and in order to restitute a mixed wave OR having a frequency F.sub.O on a third terminal. The cavity formed by the internal space of the casing is tuned to a "sum" frequency representing the sum of the frequency of the mixing wave F.sub.L and of the frequency of the incident wave F.sub.S.

Abstract: The filter is of the type comprising a waveguide and an electromagnetically coupled dielectric resonator. A slot constituting the waveguide is cut in a metal plate forming part of the filter. The resonator is separated from the metal plate by a dielectric support.