Abstract: A device for transmitting energy comprises: a wall separating two media; and at least one conductive element passing through the wall, the conductive element comprising an energetically conductive material extending in a longitudinal direction. The conductive element is joined to the wall and comprises a hole passing through the wall and extending in a direction substantially parallel to the longitudinal direction on either side of the surfaces of the wall, over respective lengths that are larger than or equal to the largest dimension of a cross section of the conductive element considered level with the wall, the maximum ratio of the area of the cross section of the conductive element with the hole to the area of the cross section of the conductive element without the hole level with the wall being higher than or equal to a threshold comprised between 0.85 and 0.95.

Abstract: A device for transmitting energy comprises: a wall separating two media; and at least one conductive element passing through the wall, the conductive element comprising an energetically conductive material extending in a longitudinal direction. The conductive element is joined to the wall and comprises a hole passing through the wall and extending in a direction substantially parallel to the longitudinal direction on either side of the surfaces of the wall, over respective lengths that are larger than or equal to the largest dimension of a cross section of the conductive element considered level with the wall, the maximum ratio of the area of the cross section of the conductive element with the hole to the area of the cross section of the conductive element without the hole level with the wall being higher than or equal to a threshold comprised between 0.85 and 0.95.

Abstract: The invention relates to electromagnetic wave guiding devices or waveguides (f<10 THz) and to processes for manufacturing these waveguides, which comprise at least one body (30) supporting at least one active wall (40). The body (30) of the waveguide is made from a volume of a ceramic selected from the following: silicon carbides, aluminum nitride, boron nitrides, and especially 3C cubic and 2H hexagonal varieties of boron nitride, diamond, beryllium oxide or assemblies of said materials. Applications: waveguides, filter cavities, reflectors and antennas for radiofrequency waves and microwaves, atomic clocks and particle accelerators.

Abstract: The invention relates to electromagnetic wave guiding devices or waveguides (f<10 THz) and to processes for manufacturing these waveguides, which comprise at least one body (30) supporting at least one active wall (40). The body (30) of the waveguide is made from a volume of a ceramic selected from the following: silicon carbides, aluminum nitride, boron nitrides, and especially 3C cubic and 2H hexagonal varieties of boron nitride, diamond, beryllium oxide or assemblies of said materials. Applications: waveguides, filter cavities, reflectors and antennas for radiofrequency waves and microwaves, atomic clocks and particle accelerators.

Abstract: The invention relates to a method of measuring the RF output power (Ps) of a microwave tube amplifier, the tube having an electron gun delivering an electron beam, an RF circuit for interaction between an RF signal and the electron beam, the RF circuit having an amplified RF signal output, and a collector having at least two electrodes for collecting the electron bream. The RF output power as amplified RF signal output is determined from the measurement of the current Ic1 coming from the first electrode closest to the gun, a calculation of the RF output power (Ps) being carried out through a predetermined relationship between said current and the output power of the amplifier. The invention also relates to a device that includes measurement means for implementing the measurement method.