Abstract: There is provided an anode stack for cooling and electrically insulating a high voltage anode of an X-ray device. The anode stack has at least a conductor member and a dielectric member, and the conductor member has a main body and a peripheral portion. The dielectric member overlies and couples with the main body of the conductor member at one surface. At an opposing surface of the main body of the conductor member, an end of the high voltage anode is coupled thereto in use. The peripheral portion of the conductor member has an annular region that surrounds at least a part of the dielectric member and which is spaced therefrom.

Abstract: There is provided an anode stack for cooling and electrically insulating a high voltage anode of an X-ray device. The anode stack has at least a conductor member and a dielectric member, and the conductor member has a main body and a peripheral portion. The dielectric member overlies and couples with the main body of the conductor member at one surface. At an opposing surface of the main body of the conductor member, an end of the high voltage anode is coupled thereto in use. The peripheral portion of the conductor member has an annular region that surrounds at least a part of the dielectric member and which is spaced therefrom.

Abstract: The disclosed broadening method consists in dividing the radar antenna into n groups of columns of active modules, applying, at transmission, a different linear phase law to each group and, at reception, forming n.sup.2 simultaneous beams, each having the nominal angular width of the complete antenna, and in shifting these beams as a whole to cover the angular domain in which the energy has been radiated at emission.

Abstract: A radar antenna includes a reception part constituted by elementary antennas, each elementary antenna delivering a reception signal to a computer for the formation of simultaneous radar beams by computation, and a transmission and reception part constituted by at least one elementary antenna. The computer uses the signals received by the elementary antennas of the reception part to form a set of radar beams within a solid angle radar beam formed by the elementary antennas of the transmission and reception part. The radar antenna finds particular application in the field of designation and trajectography radar.

Abstract: An antenna system capable of both circular and linear polarization. The antenna structure includes a symmetrical stripline 90.degree. hybrid coupler, having first and second output branches. A first and second dipolar radiating element is provided, each of the radiating elements having two quarter wave branches formed by folding the stripline conductors. In the first dipolar radiating element, the peripheral conductors of the stripline coupler are folded in the same direction, transverse to the axis of the stripline, and another quarter wave branch is formed by extending the center conductor of the first output branch of the hybrid coupler in an opposite direction. The second dipole radiating element is similarly configured to have two quarter wave branches, comprising the peripheral conductors and the center conductor of a second output branch of the 90.degree. coupler. A second 90.degree.

Abstract: In a waveguide (1) having slots (2, 3) perpendicular to the axis of the waveguide and cut in a narrow wall of the waveguide, a printed circuit plate (4) is positioned. This plate has patches (5, 7) for coupling with the energy being propagated in the waveguide and microstrip lines (6, 8) connected to the patches to excite the slots (2, 3) with the energy thus tapped. These slot waveguides can be used particularly in array antennas.

Abstract: In a reflective angle of a radar, auxiliary elementary sources are positioned beneath the main source. By the division of the measurement signals of the measurement channel of the main source and of the auxiliary measurement channel, a monotonous characteristic is obtained, enabling the elevation angle to be measured with high precision. FIG. 1.

Abstract: A pick-up for electromagnetic energy radiation guided between at least two parallel ground plates includes a plane conductive tongue positioned between the two ground plates in a plane parallel to these plates and pointed in the direction of propagation of the guided electromagnetic energy, and obstacles interposed between the ground plates and the tongue converting the electromagnetic energy guided between the two ground plates, propagated in transverse electromagnetic mode, into an electromagnetic energy that is propagated in transverse asymmetrical electromagnetic mode in a strip line structure formed by the tongue and the two ground plates.

Abstract: This distributor relates to radar antennas. It is used notably for making multiple-beam antennas. It is of the optical Blass matrix type. It has a horn-shaped guide with two energy leading-in central strips that radiate directly in space by means of excitation obstacles which are cylindrical studs arranged in pairs on the inner surfaces of the side walls to obtain the desired directivity. By means of this distributor, it is possible to simultaneously achieve sum and difference patterns or again different directions of aim.

Abstract: An antenna of the random spare volume array type comprising a plurality of elementary antennas with almost omnidirectional individual radiation distributed according to a statistically isotropic random relationship of distribution within an enveloping volume having a shape generated by revolution, the mean spacing between elementary antennas being notably greater than a half wavelength of the minimum frequency to be received or transmitted, each elementary antenna being connected to an active module comprising individually controllable phase-shifters themselves connected to a common distributor. According to the disclosure, the elementary antennas are formed by dipoles oriented vertically and supplied by a supply line comprising a first section, extending horizontally between the respective dipole and a common vertical tower coaxial with the enveloping volume having a shape generated by revolution, and a second section extending to the interior of this tower and ending in the distributor.

Abstract: The I.F.F. sum and difference channels are obtained by means of the reflector of the radar, illuminated by primary radiating elements associated with the horn of the primary source of the radar. Furthermore, the signals of the I.F.F. sum and difference channels are suitably mixed to obtain a reduction in the level of the cross-polarized signals.

Abstract: Such a system typically comprises: a plurality of elementary antennas configured in an array, each having an associated active module, a plurality of DBF modules, each receiving a microwave signal coming from the active modules and delivering complex digital data (I, Q) representing the input signal; and DBF processor means preparing weighted sums on the basis of this complex digital data, the weighting corresponding to a reception channel defining a narrow beam of the radiation pattern of the antenna.

Abstract: A reflector of an antenna in a radar system subject to jamming carries a multiplicity of localized phase shifters which are sequentially controlled by a processor to introduce certain phase modifications into incoming signals reflected toward an associated radiator. The processor, operating on branched-off portions of the incoming signals, compares the magnitudes of the signals received in the several operational states of each phase shifter and maintains that operational state for which the signal level is at a minimum. The comparisons may be carried out on signals received at the end of a signal-transmission cycle, lacking a useful component.