Abstract: An assembly includes a first waveguide and a second waveguide extending longitudinally along a first axis, each having an end, each comprising a first annular groove, the two ends being contiguous along the first axis, and an assembly device for assembling the first waveguide and the second waveguide, wherein the assembly device comprises a sleeve surrounding the ends of the first and second waveguides and having an inner wall comprising two first annular grooves facing the first annular grooves of the first and second waveguides, two reversibly deformable waveguides, each being positioned in a first annular groove of the sleeve and positioned in a first annular groove of the first and second waveguides, so as to block the first and second waveguides in terms of translation along the first axis.

Abstract: An assembly includes a first waveguide and a second waveguide extending longitudinally along a first axis, each having an end, each comprising a first annular groove, the two ends being contiguous along the first axis, and an assembly device for assembling the first waveguide and the second waveguide, wherein the assembly device comprises a sleeve surrounding the ends of the first and second waveguides and having an inner wall comprising two first annular grooves facing the first annular grooves of the first and second waveguides, two reversibly deformable waveguides, each being positioned in a first annular groove of the sleeve and positioned in a first annular groove of the first and second waveguides, so as to block the first and second waveguides in terms of translation along the first axis.

Abstract: The invention relates to a rigid multilayer material for thermal insulation, in particular in a vacuum, the material comprising at least one insulating plate of honeycomb material sandwiched between two aluminum- or gold-coated skins of low emissivity. In order to optimize thermal insulation, the diameter of the cells is at least twice their height. The multilayer material may have as many layers as needed. The cells of adjacent layers may be offset in order to further minimize paths for heat conduction through the structure. Holes may be pierced in the side walls of the cells in order to allow them to empty out when the material is put into a vacuum. The invention also provides a method of making such a material.

Abstract: A resonant cavity device comprises a waveguide body having a lateral wall extending in a longitudinal direction, having a first coefficient of thermal expansion, and delimiting a resonant cavity in conjunction with opposite first and second end walls. The first end wall has a second coefficient of thermal expansion lower than the first coefficient and has an internal face fastened to a first assembly comprising at least one main plate having a third coefficient of thermal expansion lower than the first coefficient and dimensions in a plane perpendicular to the longitudinal direction less than but substantially equal to those of the cavity.

Abstract: A resonant cavity device comprises a waveguide body having a lateral wall extending in a longitudinal direction, having a first coefficient of thermal expansion, and delimiting a resonant cavity in conjunction with opposite first and second end walls. The first end wall has a second coefficient of thermal expansion lower than the first coefficient and has an internal face fastened to a first assembly comprising at least one main plate having a third coefficient of thermal expansion lower than the first coefficient and dimensions in a plane perpendicular to the longitudinal direction less than but substantially equal to those of the cavity.

Abstract: The invention relates to a rigid multilayer material for thermal insulation, in particular in a vacuum, the material comprising at least one insulating plate of honeycomb material sandwiched between two aluminum- or gold-coated skins of low emissivity. In order to optimize thermal insulation, the diameter of the cells is at least twice their height. The multilayer material may have as many layers as needed. The cells of adjacent layers may be offset in order to further minimize paths for heat conduction through the structure. Holes may be pierced in the side walls of the cells in order to allow them to empty out when the material is put into a vacuum. The invention also provides a method of making such a material.

Abstract: A structure for reducing shock transmitted from a source (6) to an equipment unit (7) in a hardware system, which structure includes a honeycomb cellular support member (2, 3, 4 or 5) carrying the equipment unit to be protected from shock and/or the source. At least some of the honeycomb cells are filled with rigid microgranules whose dimensional characteristics are preferably heterogeneous, within given limits.

Abstract: A fixing arrangement with damping for fixing a device (1) to be protected from vibration, which device includes at least one mounting portion via which the device is fixed to a portion of a support (2) by fastening means (3, 4). The arrangement includes at least two piezoelectric elements (5, 6), each of which has its electrodes electrically shunted by an individual or shared impedance of determined structure. At least one of the elements (5) is used in bending and is interposed between a portion of the support and a mounting portion of the device to be protected. At least one of the elements (6) is used in compression and is interposed between one of the fastening means and either the support portion or the mounting portion.